YT YouTube2Text

YouTube2Text → Transcripts → [CS61C FA20] Weekly Lecture 11.LIVE - OS, VM, & I/O

[CS61C FA20] Weekly Lecture 11.LIVE - OS, VM, & I/O — Transcript

by CS 61C Departmental · 11,855 words · 1,587 segments · language en · Watch on YouTube

Open in transcriber Summarize with AI Download SRT/VTT

Full transcript

0:00let's not do it let's not do it being
0:01recorded that's what I want to hear
0:03perfect okay
0:05yeah oh my gosh can't even welcome
0:09everybody
0:10to
0:1261c week 11 live session
0:16wo good to see you all Bor is still
0:19trying to figure out how to get Bor this
0:22whole technology is new to Bor so we're
0:23working on
0:25things we're just having some fun um
0:29let's see don't don't touch my window
0:31okay I can I can un I can unsp Spotlight
0:33you uh if you'd like Anyway welcome
0:37everybody let's let's Okay let me
0:48unspotted midterm that's all that's all
0:50water under the bridge let's looking
0:52forward the week this week's material is
0:54OS virtual memory and IO so this is our
0:58agenda for today we're going to welcome
1:00we have two guests we're delighted to
1:01have two guests join us uh Sharon
1:03Mueller from Berkeley College
1:04engineering advising group and K
1:07asanovich from Berkeley and also the
1:09SciFi the SciFi uh CEO so exactly
1:12founder so co-founder happy to have him
1:14join us a little bit later uh we'll do
1:16Computing the news as we always do and
1:18we'll talk about the week's plan and
1:19always have't ask us anything uh Q&A
1:21time at the end so um let me do check
1:25the Q&A good that stuff all right we're
1:27using M by the way for the anonymous
1:29attendee that's how we're doing this is
1:30not a this is not a zoom thing this is a
1:32a special feature M all right so let me
1:36introduce and let me Spotlight you
1:38Sharon so you can get added here there
1:41we go let me introduce Sharon Mueller
1:43who is the director of advising and
1:44policy from the engineering service and
1:45services thank you Bor for reaching out
1:47and thank you for Sharon for be able to
1:49make the time for our live session we've
1:51got 43 students here I predicted around
1:5350 but many many many hundreds of so
1:55watch this and we are recording this
1:57watch this a little bit later when they
1:59have have the chance
2:00um want to give you the floor certainly
2:03this is a a remarkable semester it's a
2:05semester that has caused um a remarkable
2:08amount of um stress and and just
2:12disruption among many many students this
2:14week isn't going to help us in terms of
2:16the chaos that's bringing but if you
2:17imagine if you lay just layer upon layer
2:19of just it's not just covid it's co and
2:21I can't leave my house and it's co it's
2:23it's also online learning like you could
2:25have no Co but online learning you can
2:27have an online course you just do in the
2:28middle of nowhere right but you have
2:29online learning on top of that you got
2:31the stresses not courses giving
2:32flexibility you've got fires and smoke
2:36and I mean right could you please how
2:39about what's the Billy Crystal line from
2:40Princess Bride how about I give you a
2:42paper cut and let you pour lemon juice
2:44on it I mean could you really make it as
2:45bad right so thank you again for being
2:48here thank you for supporting for all
2:49the hard work you do to have you you and
2:51your team support our students um feel
2:53free to share some of the things that
2:55you can help them think about how to how
2:56to be resilient how to support
2:58themselves where to reach out all all
2:59the resources that we have at the
3:01College engineering and campus level
3:02what you know it's people at different
3:04levels of of Crisis from from oh I'm
3:06feeling stressed to I'm feeling a lot of
3:08stress to oh my gosh you to all whatever
3:09the the fin line is what what do we do
3:12you know how do people know what to do
3:13what the next levels are what what
3:15bucket they fall into well this is a
3:16little stress I talk to you know who etc
3:19etc plus planning for the spring that's
3:21all that stuff you know that there was
3:23word about reducing class sizes and now
3:26I can't graduate like it's just layer
3:27upon layer upon all these things and
3:29yuss Berkeley's in a hole of $450
3:31million or something so thank you so
3:33much everybody with the lemon juice all
3:35over my body so anyway Sharon please
3:39welcome again and feel free to share and
3:40I'll I'll I'll I'll on the spotlight
3:42myself and you can just take the floor
3:43and share your thoughts with the
3:44students thank you so much thank you so
3:46much for that introduction you kind of
3:48stole my thunder there because I was
3:49going to mention all those things please
3:52uh yeah so certainly I think what you
3:54touched upon is our emotions are
3:56heightened right now and I know this to
3:59be true for myself and everyone in my
4:01circle and certainly for our students as
4:04well um so I think it's important to
4:08recognize that that's normal that is a
4:10normal response to everything that you
4:13mentioned um but the benefits of being
4:16part of a big campus uh are that we do
4:19have a lot of resources to help students
4:22and um I want to highlight kind of the
4:25big ones to help students out it's okay
4:28if I share my screen
4:30yes please yes pleas oh no no share
4:33screen here we go all panelists all you
4:36ready to go it's all you yep sorry oh
4:38there you go okay fixed it just fixed it
4:41so um here we
4:45go so I just wanted to highlight are you
4:47seeing my screen that says resources
4:49okay perfect all right so um I just
4:52wanted to highlight the resources that
4:55are available to all students now some
4:58of these even though they're in the
4:59College of Engineering I also want to
5:01mention that they are available to
5:02students in this class um because eeks
5:05is within the College of Engineering so
5:08General well-being there's I found an
5:11article at UCSF a while ago that I
5:13thought was super helpful in just
5:16normalizing the experience that we're
5:19all having and also beyond that really
5:22gave some tools and tips on how to
5:25manage those feelings and what can you
5:27do for yourself to kind of get get you
5:29through this time um so if you want to
5:33read that article I found it to be very
5:35helpful so I wanted to share it in ESS
5:38we actually have three psychologists who
5:41work within engineering student services
5:44however they are available to all of you
5:46as well and I've put our website on
5:48there they have drop in hours three days
5:50a week and um you are welcome to contact
5:54them at any time for
5:56support um also the Caps which is
6:00counseling and Psychological Services
6:02which is part of university health
6:04services has even more counselors and um
6:07social workers available for you I think
6:11you know I kind of look at it as
6:13coaching you know even Olympic athletes
6:16need coaching and we're kind of in the
6:18Olympics of life right now we're kind of
6:21in the Olympics of trying to get through
6:24this race that feels like it's
6:26endless um so if you can if you feel
6:30like you could really use some coaching
6:32and and maybe some tools to help you get
6:36through your day and kind of think about
6:38what we're all managing and how to
6:40manage that yourself I highly recommend
6:43reaching out to the
6:45counselors there's also a part of their
6:47website which just touches upon Stress
6:49and Anxiety management just identifying
6:52what am I feeling and then recognizing
6:55that there are things that I could do to
6:57help myself and what are those
7:00and then there's uh 211.org which is if
7:03you don't want to use the university
7:05resources you can go to 211.org and you
7:08put in your zip code and you'll be
7:09connected to a whole bunch of resources
7:11in your local
7:13community um now we know that many
7:17families are also experiencing financial
7:20hardship right now the campus does have
7:23a basic need
7:24Center and if you are having housing
7:28issues or for food insecurity they can
7:32assign to you a case manager who will
7:35basically get you connected to all of
7:37those resources the campus also has a a
7:40student technology uh Equity program
7:44that can help you if you're having
7:46issues if your laptop is old and you
7:47need a new laptop or if you need Wi-Fi
7:50or hotspots you can apply for those
7:53funds and also financial aid is doing
7:57cost of attendance adjustments
8:00pretty regularly for students
8:02recognizing that um your cost of
8:04attendance may have changed and your
8:07financial situation may have changed so
8:09that's something that's available to you
8:11always and also there are emergency
8:14loans that you can get through financial
8:17aid now we know that all of all of this
8:21can lead to academic struggles and
8:23that's understandable that we we all
8:26have a lot going on and it's hard to F
8:28harder to focus
8:30you might be under additional stress
8:32because perhaps you're feeling that this
8:34grade in your course is essential
8:37because you're trying to declare
8:39computer science or maybe you're in the
8:41College of Engineering and you're trying
8:42to switch to eeks so um that can add
8:46another layer of stress so some of you
8:50may find that you're
8:53overloaded and you may be in 13 units or
8:5612 units and you may feel overloaded and
8:58that's fine
8:59I know that letters and science is
9:03totally flexible with late drops this
9:05semester in fact there's a form
9:07available to letters and science
9:08students on your my academics class
9:11enrollment card in Cal Central you just
9:14have to fill out the form and you can
9:16drop one or more classes in engineering
9:19we're also being flexible with late
9:22drops ours is a Google form the link is
9:24is on this slide and you just have to
9:28write a sent or two about what you're
9:30challenged with as far as covid-19 or
9:32remote learning and we're allowing late
9:35drops we're allowing students to go
9:37below 12 units um which leads me to
9:40reduced course loads and uh all colleges
9:44now are being flexible because we
9:47understand what students are going
9:49through and we know that sometimes you
9:52just can't carry the load that you would
9:53normally
9:55carry and then there's also the option
9:57of an incomplete grade and that's
9:59something that you if you've been making
10:01good progress in the course up until now
10:04but you're just feeling like uh you're
10:07not going to be able to finish all of
10:08your courses that might be something
10:09that you want to talk to your professors
10:13about we we've already actually
10:15pre-approved everybody if if anybody
10:17asks for it they get it yes without any
10:19any questions asked how about that for a
10:21policy is that
10:24perfect yeah that's great that's great
10:27so that's all so they have that in their
10:28back pocket exactly that's said and
10:30actually about 10 people 10 10 people
10:32asked for that already and have already
10:34pre-approved pre-approved theyve get it
10:36and no questions asked could they you
10:40they don't email thats a form there's a
10:41form online they just fill in the form
10:42and it's all done that's great that's
10:45great that's great because I know
10:47students don't want to drop courses I
10:48mean we're we're late in the semester
10:50and they put in a lot of work and so
10:52that's a really great option for them we
10:55just remind students of course they do
10:57have to finish it at some point and they
10:59have to be mindful that that's going to
11:01then add to their workload in the spring
11:04semester or during the summer and so
11:06they should plan accordingly we can work
11:08with those students on their course for
11:10those semesters as well that's huge I've
11:12also by the way promised to extend it as
11:13long as they need it so so many people
11:15say we won't extend it past the next
11:17semester but I've already said if you
11:18need the summer you need next fall
11:20whatever however long it takes I'll be
11:21here for you and allow to extend them
11:23however long it takes for them to finish
11:24it that's great and they just need to
11:26know that there is a form that they need
11:28to fill out with their call in order for
11:30us to do that on the back end that's
11:31right that's right yep all right well
11:34thank you very much to extend it to
11:37extend it they don't need form to extend
11:38it only for the ex extend it Sharon do
11:41you have time for a couple of questions
11:43yes exactly sure perfect yeah so the the
11:46first one that you know the one that we
11:47are encountering and we we have people
11:50students who are abroad at the moment
11:52and they are often confused what does
11:55apply to them and what they
11:58can uh
11:59what kind of help they can get when
12:01they're abroad that's true right do you
12:03mean as far as like an international
12:06student who's worried about course load
12:08because of a Visa or yeah course load
12:11related to Visa related to incompletes
12:15related to um a mental health support
12:18services too yeah right yeah yeah I
12:20guess all everything's remote right so
12:22you're calling up different different
12:23different support levels so it's yeah so
12:25all the support is available to them the
12:28same it might work so well for them
12:30because maybe it's in the middle of the
12:31night for them oh that's a good point a
12:33good point yeah a lot of the advisers
12:36are trying to hold evening hours or
12:38early morning hours to accommodate
12:40students who are all over the world um
12:42and I think there are some counselors
12:44doing that as well as far as resources
12:46they're all available to all students um
12:50with course loads it depends on the
12:52students visa and whether or not they're
12:54in an active V Visa status a lot of
12:56students aren't right now because
12:58they're not in the us and so they don't
13:00have to be on an on their visa at the
13:03current moment we are advising students
13:06however that if they're applying for a
13:07visa to return which likely they will be
13:11they should check in with the Berkeley
13:12International office to make sure that
13:14taking reduced course load now wouldn't
13:17have any effect on their application for
13:19a Visa for when we do come back to
13:21campus but there are also accommodations
13:24even for students who are on a student
13:25visa where they're allowed to drop below
13:2812 units they just have to go through a
13:30process with the uh Berkeley
13:32International office in order to do that
13:34and we have to sign off on it but we're
13:36signing off on those all the time and so
13:39I know that a lot of students are doing
13:40that this semester um I don't think this
13:43is relevant for students who are getting
13:44incompletes though because the
13:46incomplete doesn't get triggered in the
13:47system until the end of the year right
13:48nobody would know if they took an
13:50incomplete for this course they stop
13:51doing the work in this course they could
13:52breathe they could finish the rest of
13:53the semester with all the other courses
13:55the incomplete wouldn't take nobody
13:57would know about it until Boom the Great
13:59are in in December so so that wouldn't
14:02so that's that's not an issue for
14:03anybody anybody want to complete don't
14:04worry about a course don't worry about
14:05all those to drop me below because no
14:07one would know about it until the end of
14:08the the year that's right they're still
14:10in a full course load yeah that's right
14:12even though they're not really but but
14:13they are so it's that's right from the
14:15point of view yeah yeah yeah but but the
14:16flip side of that is that next semester
14:18they still to have their minimal course
14:20load on top of this course they're doing
14:22for no credit so that's it's a little
14:24bit of borrow from one Rob from Peter to
14:26pay paal where next spring it's it's a
14:29heavier course Lo you're taking 12 but
14:30you're really taking 16 because there's
14:33a little bit of that so you need to make
14:34factor that into the to the decision
14:36process as well right right that is part
14:39of the process but Summer's out there I
14:41mean The Summer's out there I would say
14:42doing the summer then because you know
14:43you have to have middle of a course load
14:44for all spring but summer who cares you
14:46could have a summer job and you could be
14:47taking 61c in the evenings I mean you do
14:50whatever you want to in the summer so I
14:51would say so just wait till the summer
14:52don't worry about the spring is I think
14:54spring is really hard just take in the
14:55summer you'll be fine I think it's
14:56easier to do yeah I would say most
14:58students who get in completes in the
15:00fall if they have the opportunity to
15:01finish it over the summer that's usually
15:03when they try to do it right right it
15:04might not be that much it turns out some
15:06I mean some people you know get sick and
15:08you know they're they can't hold their
15:10dinner down the day before the final
15:11they've done everything but the final
15:13then what they basically do is just take
15:14the final again so that's that's not a
15:15lot of workload but depends on how much
15:16work you have to actually still do for
15:18the next semester right yeah right makes
15:21sense wonderful there um there's a
15:23question that the student
15:25asked here is the question so the UHS
15:29service only allows for three sessions
15:31free which isn't enough for a lot of
15:33people in a very short term is there any
15:36other uh I guess are there any other
15:39resources for counseling if we can't
15:41afford um otherwise so well I thought it
15:46was five sessions free unless they've
15:47changed it but um and those are
15:50available to all students whether or not
15:51they have uh the student health
15:53insurance plan and so it would depend on
15:56whether or not the student has that
15:57health insurance plan or not students
16:00who have the health insurance then it's
16:01a co-pay and I think it's $15 per
16:04appointment at that point um and there
16:07are many many um practitioners in the
16:12community who serve Berkeley students
16:14for that same copay as well so I know
16:17sometimes the UHS counselors It's can be
16:20hard to get into their schedules but
16:22there are many in the community as well
16:25if the student does not have the um
16:28student health insurance I think they
16:30have to have some kind of insurance so
16:32they might want to look into their own
16:33insurance and see but there are also
16:36clinics that do um sliding scales so and
16:40actually the Caps website has a list of
16:43those on there as well that um some you
16:46can go for for no money if if you're in
16:49low income brackets oh that's great
16:51that's actually really nice so that's
16:52available to our students and those
16:53those resources are on the um UHS
16:56counseling and Psychological Services
16:58website
17:00MH um so your slide was great can we
17:04have it to post it in the some I will
17:07send it to you yeah that's great
17:08resources wonderful I think it would be
17:10a useful one to to be actually put on on
17:13E's
17:15U sumary to for accessible to all the
17:18classes that's a good point that's a
17:20good point sure y definitely thank you
17:23that's a very very good one one slide
17:25summary uh everything you need to know
17:27about advising and the layers and the
17:30layers is important too um folks anybody
17:32else have any questions Sharon is such a
17:34resource anybody have anything else
17:36jumping into the Q&A or the chat very
17:38fast before we before we have to
17:40transition and I put my email in the
17:43slide I'm happy if um students do not
17:45have to be in the College of Engineering
17:46to contact me so if they're in LNS they
17:49can certainly contact me and I can get
17:51them connected this you know I actually
17:53learned something I didn't know that if
17:54you were taking an eek course which this
17:56course certainly is you get access to
17:58the resources that are connected to that
18:00so that's a great I I thought well no
18:02wherever your college is you know sorry
18:05you're not in the you know have that
18:06special handshake for eeks I didn't know
18:08that that that's great including the
18:10center for access to engineering
18:11Excellence which offers free tutoring
18:13for anybody in our courses and even in
18:16math courses or physics courses you do
18:18not have to be in the College of
18:19Engineering to get that outstanding
18:20outstanding I don't know how the
18:21tutoring is working I'm usually you drop
18:23in the tutoring center I don't know how
18:24the tutoring Works online maybe that's a
18:25little harder to do it is it's still
18:28drop in but yeah it is more challenging
18:30for sure it's still Dro in on campus you
18:32mean so they only no it's it's Dro in
18:34online oh Dro in Virtual I see oh yeah
18:36so they actually meet with a someone
18:38first the zoom room wow wow wow look at
18:40that yeah yeah yeah and you meet with
18:42somebody first and connected and
18:43understand the system and how it works
18:45and then you actually engage it then
18:46they put you in the room yeah oh
18:48beautiful that's good like the triag
18:50kind of thing that's good yes nice nice
18:51nice well I don't see any questions
18:53popping up thank you so much 50 so much
18:56thank you for giving us time oh my
18:59goodness no this is a great great well
19:01worth the time thank you again for thank
19:02you goodbye bye everyone thanks for all
19:04you do folks wonderful all right thank
19:06you all right we're back all right let
19:09me spot all right we have uh we have uh
19:13our we have our guest we have our guest
19:15wonderful have a lot of guests this is a
19:17good day this is a good day ksta good to
19:19see you let me switch slides here so you
19:21can see
19:22it do you want to do the
19:25introduction well I I can say a few
19:27words you know three fulltime jobs at
19:30the moment each one of them is listed at
19:32you know less than 50% of a time I guess
19:36so he's a Prof professor at UC Berkeley
19:39um he uh very um we we mentioned him a
19:44few times we mentioned the class 152 so
19:47it's a good time to ask him about 152 uh
19:50now uh I know a lot of students are
19:52interested and there is an interesting
19:53situation that we are facing that you
19:55know I think both the class and the
19:57weight list are full um so I think
19:59something will need to happen over there
20:01wow that's great good to see the
20:03interest in 152 wonderful yeah yeah
20:06exactly yeah so um I think kir will have
20:08stuff to deal with um over the next few
20:12weeks or months uh but I think we need
20:15to unglue that one or get it unstuck so
20:19people can get at least on the waight
20:21list that he um uh is also uh he is one
20:26of the co-founders of s five but I think
20:29he spends a lot of time um in the risk
20:33five Foundation where he's the chairman
20:35of the board and perhaps he can he can
20:37tell us a few first tell us a few words
20:39how he got here maybe you know you we
20:42usually ask our guests how did you get
20:45here how did you become a professor were
20:47you just born and and said okay I'm
20:49gonna be a professor in
20:50[Laughter]
20:52barley uh no it's a short answer so uh
20:56uh it all started a very very long time
20:58ago ago um I think uh when I was a kid
21:02growing up um I grew up in England for
21:05one thing so I'm I was born even though
21:07I'm Serbian ancestry I was actually born
21:10in England and grew up in England um and
21:13uh grown up in a very small town in
21:15middle of England and the school there I
21:17was interested in technology and things
21:20and um but this was very early days so
21:23um like for example I think my school
21:25got one computer for the whole school
21:27was an 8 bit micro for the entire school
21:29was a Commodore pet and I was about the
21:31only person who had any idea what it was
21:33supposed to do and at the same time I
21:35actually bugged my parents into buying
21:36me one of the very early 8bit computers
21:39I thing called an acorn atom which was
21:41from the acorn company in England um and
21:45um I was just fascinated by computers
21:47and this was a great machine for me
21:48because they gave you the schematics the
21:50whole electronic wiring diagram with the
21:53whole computer and they also gave you an
21:55the computer had an assembler so you
21:56learn a program an assembler so
21:58basically age you know I was right age
22:0014 15 I was teaching myself assembly
22:02code and basic programming and the
22:03reason I was into this was I like video
22:06games so back then um it was one of
22:09these things where there was a a
22:11traveling fair that would come to town
22:13once a year in the summer this Fair
22:15would come to town and this one summer
22:17in I think it was 1979 they came and
22:20they had an arcade of the very first
22:21video games right this are like Space
22:23Invaders galaxians and I thought wow
22:26what is this you got to imagine like now
22:28you you will play video games I'm sure
22:30our friends that do um but this was like
22:32you're like you know 14 15 years old and
22:34the first time you've ever seen a video
22:35game I'm like wow what is this thing you
22:38know and uh and you you emptied your
22:39whole school budget your whole College
22:41Budget on that probably right like all
22:43of us
22:44did yeah so I'm still paying back you
22:46know 10 P pieces you know my poor mother
22:50I you know she probably lost all these
22:5110 P pieces when I went to play these
22:53games right um and you know I was just
22:56fascinated this is just amazing how do
22:57they do this
22:59um and there was a the other unfortunate
23:01thing was you know this this F came and
23:03went but then an arcade opened up
23:05literally about three minutes walk from
23:07my house and this arcade all these video
23:09games in and I could just walk in there
23:10and out and I would spend many too many
23:13like late afternoons evenings after
23:14school in this place and too many 10
23:16pence pieces but I got to know the
23:17owners of the arcade I was there so much
23:19and then I started like getting them to
23:21open the machines I was looking in the
23:22back of these machines like how wow wow
23:25open them up and I'd see all these
23:27circuit boards and everything wow I'd be
23:29like this is pretty interesting I
23:31started reading up about it and that
23:32that's kind of what got me into
23:34computers was figuring out how these
23:36video games work so I wanted to learn
23:37how to write video games so I got the
23:39little computer so I started programming
23:41and the thing was after I got into
23:42writing games um I really didn't play
23:45the games that much it was more fun
23:46riding them than playing them but I was
23:48also interested in the processes how you
23:50build the why did they pick this design
23:53for the why did the 6502 have the ax and
23:55Y registers why were there only these
23:57instructions not the these other
23:58instructions you know I was still
24:00getting my head around this you know as
24:02a um you know this is in the equivalent
24:05of high school I guess I I had this
24:06computer and I had one got to remember I
24:08had one computer and my school had one
24:10computer and that was it um and then uh
24:12during high school we had uh dial in
24:15access to a pdp1 in the next town so
24:17this town was eight miles away and there
24:20was a I think it was like a um 96k 9 k6
24:24board modem that connected our school to
24:27this computer eight miles away and all
24:29these terminals were hanging off this
24:31pdp11 I learned to program on the mini
24:33computer there um so this was also fun
24:36and I got me so I was very interested in
24:37computers at that age but then I went to
24:39college I went to Cambridge as an
24:42undergrad and um I did electrical
24:45engineering because computer science
24:47wasn't the serious subject here so the
24:50attitude then was oh computer science is
24:51just the thing you do off to the side
24:53but the serious stuff is engineering so
24:54I did an engineering degree uh
24:56specializing in electrical engineering
24:59um and at Cambridge at that time the the
25:01people who did computer science were
25:03considered the failures like if you
25:04couldn't do physics or chemistry or
25:06biology after the first year you would
25:08go off and do this the final two years
25:10would be a computer science degree
25:11that's funny so funny yeah and and also
25:15if you really failed you spend two years
25:17doing something else then really badly
25:18there was a one-year constellation
25:20degree in computer science you could get
25:22so it really was considered so I didn't
25:24do computer science at the time as a
25:25degree because it wasn't considered a
25:28serious subject yet you couldn't do an
25:30entire three year I didn't got degrees
25:31of three years you couldn't do a
25:33complete three-year degree just in
25:35computer science so I did electrical
25:37engineering um I think that was actually
25:38a good choice for me because I learned a
25:40lot about you know voltages currents the
25:42physical side of things which you know
25:44I'm interested in computer architecture
25:45it's very important to understand how to
25:47build real machines and also my thinking
25:49at the time was you know this Computing
25:51software side of things is kind of easy
25:53you know like it I've been doing it for
25:54a long time whereas electrical stuff
25:57that was hard I I didn't know that so I
25:59wanted to learn it's is stuff I didn't
26:00know so I was excited to go learn about
26:03you know how to build circuits and you
26:05know do complex math and things that I
26:06needed for um that side of stuff so the
26:09other thing that happened to me was
26:10while I was going to University I was
26:12sponsored by a company called
26:14gec this was the British company gec not
26:17the US company GE and the British
26:20company gec um they had a sponsorship
26:23program and they had a research center
26:24in in London in Wembley um uh near the
26:28big football stadium is um so I used to
26:31have to go there in the Summers for
26:32internships and also part of the deal
26:35was I had to go work there after I
26:36graduated so I finished my
26:38undergrad then went to work with them
26:40and what I went to work on was a big
26:41fifth generation computer architecture
26:43project so they put me on a um big the
26:47spre European research project in
26:48computer architecture and that's really
26:50got me more interested in computer
26:51architecture so I started reading these
26:53papers from these guys in Berkeley and
26:55Stanford about risk and you know it was
26:57all like oh this is really cool stuff so
26:59during that you know after um undergrad
27:02basically working on a computer Arch
27:04research project working on a chip
27:06design that's when I got really into
27:08doing all this and at the time I thought
27:11well this is really cool I want to do
27:12more of this and when I left undergrad I
27:15was 100% certain I did not want to do a
27:17PhD I just want to go build stuff do
27:19real things and not because in England
27:21you have to realize the phds were
27:22considered more Ivory Tower and academic
27:25and I wanted to go build stuff I like
27:27making things right and and but after a
27:29couple years working at this um in this
27:31research project reading these papers
27:32from Berkeley and Stanford and other
27:34places I was like yeah this is exciting
27:36but I want to do a PhD in the states
27:38like it I didn't want to do it in the UK
27:39that didn't sound like fun so I applied
27:43to all these schools well a few schools
27:45I picked you know Stanford Berkeley MIT
27:47and Caltech with the four that I applied
27:49to um and you know Berkeley and staff
27:52with my top two choices because I'd read
27:54the the papers from Hennessee and
27:56patteron um so that's why I was excited
27:59to go there and I got into Berkeley it
28:00was it was I was very lucky that was my
28:02first choice and I got in with a uh I
28:04remember I got an offer that included
28:06being a GSI in my first semester of
28:08Berkeley so I came to grad school in
28:10Berkeley um arriving in Berkeley was my
28:13first time arriving in America so I came
28:15to Berkeley you know to go to school and
28:18I'm like where's the beach right
28:21so we do have a beach this is really far
28:24west like this is California I thought
28:27where's the beach like and I come to
28:28Berkeley and it's uh very pleasant but
28:30it's you know the other experience I had
28:33my first day on campus at Berkeley I
28:35walked up I was staying with a host
28:37family in Orinda so I took the the B to
28:39rockage and walked up uh Telegraph
28:43walked up Telegraph to come into Camp no
28:45I was U I worked up um College college
28:48to come into campus and I was walking up
28:50there all these guys with long hair or
28:5260s clothed and the whole street was
28:55light I'm thinking wow Berkeley really
28:56is in the 60s to grow my hair long now I
29:02have what's going on this is you know
29:05this is really in the 60s what I didn't
29:06realize was the grateful Dad were
29:08playing at the
29:10Greek my first day on campus this is
29:13what I I saw what's that
29:16smell that was my introduction to
29:18Berkeley my first a Greatful concert so
29:22I uh got to campus obvious had a great
29:24time uh learned a lot um I must say
29:27coming to America from the UK my first
29:30impression was Americans are crazy you
29:33know they just they work way too hard um
29:36and I was a TA for 60c which was the
29:39predecessor of
29:4061c appointment so I actually was a TA
29:43for this class with Paul hilfinger was
29:45the Wow
29:47Wow first semester um and I just
29:50remember how hard everybody worked in
29:52the I'm sure it's exactly the same now I
29:54know it's exactly the same now but I was
29:56thinking these undergrads are doing in
29:57one one semester what in Cambridge you
29:59would do over you know a year wow and
30:02you were taking three other classes too
30:04how crazy these Americans are and all my
30:06other foreign students I was hanging out
30:07with they're like the same these
30:08Americans are
30:10nuts but after after a few months we
30:14were all nuts too and working just as
30:15hard right so sure we got into it um
30:19that was exciting or what other thing
30:20happened that first semester I was see
30:22was when the big earthquake hit Creator
30:24hit during a 6C class oh my goodness
30:28there was a I had to transcribe the
30:29notes and the video included the the
30:31earthquake right in the middle of the
30:33look at that 1990 yeah 1989 89 89 right
30:38that's right 9 so you know I did my PhD
30:41and uh you know I worked on actually
30:43building accelerators for neuron Network
30:46training which is kind of funny because
30:47it's what people are into right now back
30:49then this was a new thing with Nelson
30:51Morgan at ixie yes indeed I know Nelson
30:53well yeah yeah so we did speech
30:55recognition I built machines to help
30:58people run speech recognition faster um
31:00so that was the last W of neuronet um I
31:03built a vector process and this is part
31:05of the experience that led to RIS five
31:07um so we did we built a few chips we had
31:10a team there and we went we did several
31:12different chip designs um and they they
31:14kind of work we slowly built up our
31:16expertise in building chips and we buil
31:18some processes and then um I decided
31:21that the way we' been pull the process
31:22is kind of kind of chunky we should use
31:24a standard instruction set and get all
31:25the software to make everything work and
31:27so okay we build a myips processor and
31:29extend it with a vector unit which is
31:31what we did but we went to talk to myips
31:33the company and said we'd like to build
31:36a myip core and they said sure go ahead
31:38we'll give you a license okay great they
31:40said $2
31:42million back in
31:44992 and that was real dollar so we're
31:47like oh no we don't we can't do that
31:49yeah not so much not so much so um we uh
31:52uh I just came back to bery and said
31:54I'll just build my own m scol i don't
31:55need I know all we' have gotten for that
31:57too million dollars would be their
31:58blessing in some test vectors right
32:00there was no softcore industry or
32:02anything at that time verog was still a
32:03new thing um people just learning how to
32:07synthesize from fog remember working
32:09with the the the Berkeley CAD
32:11researchers um Ellen covich and she's
32:13working on CY synthesis tool and I was
32:15using early versions of that to do the
32:17synthesis for this chip um so it's very
32:19early days so anyway we just ignored
32:21nips and I just built my own myips core
32:22from scratch but that was one of the
32:24formative things for risk 5 is like why
32:26do we pay these guys so much money
32:28basically a list of op codes um didn't
32:30make any sense at all right um so we
32:33built this yeah we built this Vector
32:35thing it was big success I actually
32:37shipped it to nine sites around the
32:38world and people used it for training
32:41training wow um you know so then uh that
32:45was my PhD then uh it was like what to
32:47do next um I decided you know one of
32:51those things going all way through grad
32:52school I didn't know whe I want to be a
32:54professor or go work in industry or be a
32:56professor go work in industry and I must
32:57have gone back and forth about 10 times
33:00um there was one point we're going to do
33:02a startup with creative Labs um sound
33:04plaster guys because this Vector chip it
33:06turned out Dave wesle or Sandman had
33:08ported all this music synthesis software
33:10to it and so there was a thought but
33:12then I thought no I need to get my PhD I
33:13need to get well one thing I needed a
33:14green card I also wanted to actually get
33:17a PD so I finished then and then uh then
33:21went off to MIT uh so what happened was
33:22I didn't even apply to MIT they called
33:24me up because they come and interview I
33:26didn't really want to go MIT I didn't
33:28think so till I got there I thought oh
33:29this is a cool
33:31place went to my te faculty then uh uh
33:35then we got you back got me back yeah so
33:37the weather got me back basically I I
33:39loved MIT but Boston I couldn't stand
33:42the weather and yeah the west coast and
33:44also the industry here you have whole
33:45industry here right that pull me back
33:48so for for those who don't know by the
33:50way there are levels of impressiveness
33:53and there's like well I applied to MIT I
33:55had to fight my way and I got in you
33:57know there's a level above that which is
33:59they call you that's what happened
34:02to it's a whole another level here
34:05that's we got a few questions from
34:07students in here let's say here is one
34:10is this the same person who altered the
34:12risk five specification I don't know if
34:15I would have done my project without
34:16that laughing out loud so are you the
34:18same person yes with with help from by
34:21especially Andrew Waterman who he was my
34:23grad student he's not graduate he he
34:24also wrote a lot of the original spec as
34:26well
34:28that's we had him also he he he was in
34:31here so we have then aan says did you
34:34have to write programs in Assembly
34:36Language or were there any languages you
34:38could program in that was related to
34:40your Acorn computer oh no so you know
34:42back then basic was the thing every B
34:45yeah that's right computers at basic in
34:47ROM and the whole programming language
34:49fit in two kilobytes of ROM
34:52right you imagine you got to write a
34:54whole interpret that fits in 2 kilobytes
34:57um yeah yes we use basic in a yeah I
34:59mean I mean I I had Singler spectrum and
35:02I got very quickly frustrated with
35:04Basics i r a ton of assembly at that
35:07time and for good video game not much
35:10after that what's funny is there's a
35:13whole generation of us we're all about a
35:15couple years away from each other
35:16actually and I I started in basic in a
35:17TRS 80 so all of us had the same
35:20experience and also fell up with video
35:21games as well a third question um is 152
35:26more like the course an E6 series or
35:3061c person says I personally greatly
35:32prefer how topics such as circuits are
35:34approached in 61c over 16b are are are
35:38any of the more advanced mathematical
35:39topics from 16b needed as well this is
35:41for 152 so 152 is more like 61c and it
35:45actually more about architecture and
35:47software so there's very little on the
35:49sort of circuit or even logic design
35:51level if you want the logic design
35:52experience you should take 151 um but
35:55152 is more architecture and
35:56interactions with soft
35:58MH and there questions if I'm enjoying
36:00161c but didn't really enjoy 16b should
36:02I still take 152 and it sounds like
36:05yes like it
36:08more secret I don't enjoy 16b
36:12either side oh boy boy I should I should
36:17have paused the recording what are you
36:18doing here come
36:20on I can edit that out in
36:23post I'll edit in post it's okay I've
36:26been vocal about
36:29this it's still it's a course in
36:31development we're still working on it
36:32we're still working on it this is great
36:34this recommend 152 for students who
36:36planing for curan software oh you can
36:38the question you're working on lowlevel
36:39software like compilers or operating
36:41systems like deep heavy or performance
36:44high performance software definitely 1
36:4615 will help you understand how to make
36:48a machine run fast and do well
36:50understand all the features what
36:52industries do you see as a future for
36:53RIS 5 everything eventually um it's all
36:57a matter of time scale so right now
36:59embed in iot uh very good for R 5 I
37:03think you'll be surprised at how soon
37:05phones are going to switch to RIS 5 oh
37:08that's going a lot sooner than anybody
37:10thinks interesting a lot of interest
37:12there servers will probably the last
37:14thing that switches over wow wow there's
37:16a lot lot of interest in Mobile right
37:18now so the recent one one thing that's
37:21happened is this recent acquisition of
37:22arm by Nvidia has really really
37:25accelerated interest in Risk 5 um so
37:28many of the companies who had been
37:30developing project risk 5 a lot of the
37:32big ones had been now they're really
37:33really they're planning to move
37:35completely to RIS
37:37five where are some places oh didn't did
37:40three help teach 16 I never T 16b yeah I
37:43never T 6B neither neither me but we
37:45probably need
37:47to I'll let you go first B enjoy
37:51it there are some places where people
37:53are switching to risk life and so um a
37:57lot of the what we call minion cor a lot
37:59of these big chips when you build a big
38:01chip like U like your smartphone or um
38:04even a laptop processor there's the big
38:07core that everybody knows about like the
38:08x86 or the arm but there's also like
38:10dozens of other little processors on
38:12those soc's and those those are places
38:14where people are switching those from
38:16what they are currently are over to r
38:17five another area where we seeing a lot
38:19of activities in storage controlers like
38:21SSD drives um so you know B like Western
38:25Digital announc they're switching
38:26everything over to 5 you know they ship
38:29billions of devices um they need they're
38:31paying a lot of En royalties on those
38:32CES they're really Keen to move to risk
38:345 also they can customize it so this
38:36ssds have custom ECC error control and
38:39uh compression algorithms and they build
38:41extensions that optimize those so that's
38:44another area um AI accelerator lot of
38:46startups building AI stuff using RIS 5
38:49um Network processes so a lot of things
38:51around servers people are moving to R5
38:53it's sort of all the all the little
38:54cores are currently moving but like I
38:56said mobile is over the next big area
38:58you get a CS five show
39:00up good stuff so I I I have a I have a
39:03question and then we'll let you go uh we
39:05have some other logistical things so the
39:07CI announced this um um PC like uh
39:12platform um that is risk Fire based I
39:15think it would be
39:16spectacular um to move all of our 61c
39:21Lives to that then we we go from you
39:23know from the beginning till the end
39:26right staying this don't have to to
39:29switch over to x86 x86 who how
39:34painful how painful is that going to be
39:37or how how ready is this
39:38platform um I think it's it's very this
39:42year or next year um so one thing you're
39:45going to see many many many more death
39:48boards come out next year there's a lot
39:50of silicon in Flight right now um so I
39:51think I'll be picking the right the
39:53right Dev board um but definitely yeah I
39:57think the the good thing is it's a very
39:59open environment so you don't have to
40:00worry about binary blobs and everything
40:02so students can see all the source code
40:03all the way down like from boot all the
40:05way through I think that'll be a good
40:07part of the experience um and uh you
40:10know the your matchboard could be fine
40:12it has it runs um AMD gpus because they
40:15released open drivers you can see the
40:17source code so I think it would be good
40:19for the students because all the code is
40:20open all the interfaces are open so they
40:22can get in and actually see you know
40:23from the very you know from hitting
40:25reset everything that happens to bring
40:27the the machine up so I think that'll be
40:29very good for people to understand
40:30that's you know you that's one of the
40:32standard interview questions when you
40:33hit reset on a computer what happens so
40:36your goals as students that be to
40:37understand everything that happens from
40:38reset onwards and bring up a bring up a
40:41system yeah that's great there are two
40:43quick questions can we get quick on
40:45liners are there any parts of the RIS by
40:47Isa
40:49um uh let me see that you want to do
40:52differently or disagree that you would
40:53want to do differently or disagree
40:55with yeah five years or 10 years of
41:00already there's already annoying things
41:01that we put in there like we wish we did
41:03differently but they're not they're not
41:05that bigger problem it's like them um we
41:08know the problems but they're not really
41:10a big they're not worth starting again
41:12the other thing you realize as soon as
41:13you build an Isa you kind of get stuck
41:15with Legacy and you have to just work
41:16with what you decided to do before and
41:18part of the craft of an architect is
41:20actually working with Legacy that's what
41:22you have to do instruction sets live for
41:24like 50 years and so you have to you
41:26know think as
41:27no matter how far ahead you think you
41:29always get something wrong once you
41:30consider some new constraint or some new
41:32thing that comes along so yeah there's
41:34lots of things I would change well a few
41:35things I would change nothing major
41:37nothing that um you know makes me think
41:39we should start again no way um but yeah
41:42um disagree with no i' I've agreed with
41:44everything so far um having been
41:46involved in designing most of it but um
41:48uh there's definitely things we'd like
41:49to do differently if we could if we
41:51could go again but we can't so we're
41:52just going to keep building if you
41:54switch the Linux PS and last question
41:57question if you switch the link PCS will
41:59we not need to simulate risk 5 in Venus
42:01and instead run it locally yeah if if
42:03it's running on a real risk 5 natively
42:05you don't need to simulate though the
42:06simulator gives you more observability
42:08you may want to simulate it so you can
42:10you know trace and debug and do things
42:12uh and see what's going on better than
42:14running on the actual
42:16hardware and actually you know relative
42:18to to what's happening tomorrow there's
42:20a call for open Hardware open software
42:22for voting machines so you can imagine
42:24some future where BAS on this you know
42:28open Aran architecture you can see all
42:30the way down you here's a voting machine
42:31and if you want to tear it apart there's
42:33nothing that would be proprietary so you
42:34can imagine a future that might involve
42:36that yeah there's actually government
42:38grants for that for is five there's
42:39people building voting machines around
42:41is five yeah that's wonderful thank you
42:43for doing that great stuff yeah thank
42:46you so much let's give k a hand thank
42:47you
42:49much great to see you thank you again
42:51for here it's funny how how close our
42:54connection was we both were you know
42:55Brad students here at Berkeley together
42:56it's that you were on the I it's on the
42:58fifth floor doing Graphics you were on
43:00the fourth floor probably with Randy and
43:01Dave and all that it's funny how we all
43:04together last week we had Tom bird in
43:06here and I think he took that class in
43:1189 AMD senior fellow
43:14now all right good okay thanks again
43:17Chris thank you good to see you my
43:19friend all right very good all right so
43:22we're back here let's talk about some
43:23Computing in the news uh let's see
43:27remove gerer from the list there okay
43:30all right so go ahead SciFi go ahead do
43:33anything yeah do do we have energy to
43:36you know they unve unveil the Linux PC
43:38based on risk fire processors do we you
43:40know are we ready to shift the labs can
43:42we get can we get going oh and swich
43:46over to the ls I mean it turns out that
43:47it took a grant I believe is either a
43:49grant or somebody had money to buy the
43:51to buy The Hive so we're going to need
43:53some equivalent thing and and he he he
43:55kept talking about a board so it may be
43:58that you know we have to have a a full
44:00fully debugged uh you know machine that
44:04can
44:05drop this thing you plug in I mean by
44:07looking at what is in there you plug in
44:08the supply uh Network and and um and a
44:12keyboard then uh right and monitor goes
44:16right you can imagine a model where
44:19where we do um we could see how how you
44:21know what the horsepower of this thing
44:22is whether it can support all the users
44:24who are going to be using it but no no
44:26we need that we need we need probably a
44:28couple of hundred of these yeah I know
44:29that's this feels very Raspberry Pi like
44:31it feels like we could have a lot of
44:32them it doesn't look that expensive a
44:34lot of them and then you know hook them
44:36up to a big Network and then just log
44:37into you know uh maybe put maybe
44:39actually put them in the machine room to
44:40be honest if not I hadist said that you
44:43could check remotely I love that idea
44:46but it might take a grant to make it
44:47happen yeah yeah I mean that they're not
44:50that terribly expensive I think I I saw
44:53I mean it's going to be quite a bit of
44:54development 600 something bucks right 6
44:58yeah that's but you know you need
45:00supplies and monitors and stuff like
45:02that for hobbyist and Engineers yeah it
45:03it's basically a much faster much more a
45:06much better produced Raspberry Pi
45:07essentially right it's a it's a Bo it
45:09looks like this you get exactly that and
45:10You' have to then wire it together and
45:12put kind of for casing around it that
45:13kind of thing yeah all right I'm looking
45:15at four minutes left we got some things
45:17to cover it's exciting that's some good
45:18stuff that's some good stuff let's do a
45:20quickie schedule check in uh we're week
45:2311 we're at lecture 29 Monday we're
45:26basically a new you want Bor introduce
45:28it mentioning this is a whole new reset
45:29F lectures again yeah so yeah we we
45:32every few weeks in this semester we kind
45:35of uh in this class we get a fresh start
45:37so we are now on Friday we start with a
45:41module that deals with the operating
45:43system support virtual memory and IO um
45:47so it's um you know it builds up on on a
45:51lot of stuff that we have talked about
45:53it covers some of these questions that
45:56uh um
45:58K mentioned what happens to a computer
46:01when you press the power switch and it
46:04starts booting and you realize you don't
46:06have a keyboard uh
46:10connected and so on right so we we you
46:14know we we cover uh some of that uh this
46:18part of material is you you
46:21actually don't need too much of it for
46:25the project for um it does help
46:28understanding generally how things work
46:31but it is um you know we have a um a
46:35homework that is
46:38um that does cover that material and
46:42there are Labs that are helpful as again
46:44as we said from last week the labs are
46:49optional um and we cover it um
46:54um yeah so so that is essentially what
46:58we have with us and then we are going
46:59into parallelism next week so things are
47:01moving fairly fast parallelism is
47:03covered by project 4 right perfect
47:06perfect um there was a question are two
47:09homeworks do next Monday I thought we
47:10collapsed two homework into one um to
47:13say they both do at the same time we
47:15move we moved two of them right but it
47:17looks the schle we postponed it from
47:19yeah the schedule may not have revealed
47:21it because it says 8 is due 119 and 9 is
47:23due 1116 I think we actually ended up
47:26moving 8 to 9 due date isn't that right
47:29we didn't update the website I thought
47:30that's what he had done so make sure to
47:32fix the website on that one yeah I think
47:33that there are two that I would do next
47:35week because we moved one that was due
47:38uh we want we didn't want to have
47:40anything also due this week either so
47:42that's another concern we've been
47:43bringing that this who knows what's
47:45going to happen tomorrow we we've talked
47:46about this in other classes trying to
47:48you know if there might be protests
47:49there might be chaos we hope that
47:51everything's peaceful um whatever ends
47:52up happening but uh we don't know so
47:55we're all trying to most people are not
47:56having classes anything due on Tuesday
47:59and giving you some time to vote if you
48:00need the time uh and trying to remove
48:02the assignments this week so we're
48:03trying to push these out a little bit to
48:04give some some free free of that all
48:07right let's do some more this is the
48:08last slide one in a minute or two here
48:10left and I can also stay a little bit
48:11later B when people want to ask
48:12questions and answer them no problem
48:14okay so uh there was a we tried to get
48:17the midterm autog graders done but we're
48:19actually backed up we're still working
48:20on the quest retake autog graders that's
48:23happened we basically have a small inner
48:24core team Who does these things and they
48:26work on that one because that's the
48:27quest retake so we're good in that one
48:30so the midterm Auto graders which are
48:31the one that affects everybody they're
48:33still being worked on um we were
48:35planning on having a midterm retake this
48:37sun this weekend but we may delay this
48:39and part of that is normally what we do
48:40is we look at the grades of before and
48:43then we make some decisions about who
48:44needs to take it based on that it's not
48:45just a blind thing it's about the
48:46factors of grades in as well um there
48:49there always were questions about do I
48:51need to take it for the whole exam and
48:52no you never need to take it for the
48:53whole exam only for the question for the
48:54sections you had technical problems on
48:56oh you know I had some trouble in
48:58section three the one I started with and
48:59then the camera fell but then I figured
49:01out how to plug it in and not and not
49:02have to fall and so then everything else
49:04was fine well then it's only question
49:05section three you might need to do it
49:07it's not a guarantee we might actually
49:08wave it um so we well that's the the
49:10plan so we may end up having to delay
49:12the retake this weekend so that we have
49:14all the grades in to know who would need
49:16to take it so it's not like if you had a
49:18if you had a we just want to we don't
49:19want to make people have to do more work
49:21than they had to and S will just take
49:22the gr if depends we'll we'll have to
49:23read all the the quotes you know well
49:25the video went off for 3 seconds well
49:27probably 3 seconds is okay well it went
49:29out for 5 minutes went out for 20
49:30minutes like how long so there's there's
49:32a kind of a soft Edge on this and we
49:34have to make some calls there and I I've
49:35made that calls and and I forgot to
49:37submit the video well then y exactly I I
49:40forgot well about that um project 4 does
49:43launch this week so that's the exciting
49:44one that that we need some of the
49:46material for this week to to launch and
49:48here's the there was a question that
49:49came up by the way I should mention um
49:52there is a group of students who are
49:54organizing um representatives to come
49:56with us in our staff meeting on
49:57Wednesdays please do respond to that
49:59Patza post I didn't link it here but
50:01there's a Patza post where people were
50:02saying fill in this form and we'll have
50:04a meeting we'll kind of choose some
50:05folks we'll have a rotating group of
50:06students who come visit us that'd be
50:07great to get feedback from everybody if
50:09you want to be one of those students
50:10please fill in that form and talk to
50:11those students and then get yourself on
50:13the list to to come meet with us one of
50:15the things that one of the questions
50:16came up during that important meeting we
50:18had last week and I want to thank the
50:19students for doing that was you've made
50:22some homework optional is it really
50:23optional and we certainly want to say it
50:25100% is optional what that means by
50:27making it optional is it's good for you
50:29it's like eating your broccoli you can
50:30survive on eating your broccoli that
50:31meal if you just want to eat something
50:33that doesn't have any green vegetables
50:34in it that's okay you probably survive
50:35but it's better for you to give your
50:36broccoli that's what this is this is
50:38good for you but you will survive it
50:40which means on the exam the material
50:43from I believe it homework 911 Bor if
50:45you want to correct me on that 91 are
50:48the ones that are optional yeah and so
50:49that means that material from the
50:51homework will not be an exam in a way I
50:54say whatever material on the exam around
50:57that material will be from lecture okay
50:59so if you don't do the homework at all
51:01you can get a perfect score on the exam
51:03does that makes I'll say it again if you
51:04don't do the homework you could still be
51:06able to answer the questions based on
51:08attending the lecture understanding it
51:09from there and moving forward there'll
51:11be nothing from directly from the
51:12homework that you had only seen from the
51:14homework will be assessing there might
51:16be overlapping if it's on the homework
51:17and on the on the lecture well they we
51:19can test it because on the lecture but
51:21nothing only from the homework that's
51:22not in the lecture we will test that
51:24that makes sense and and and ju just to
51:26make sure I mean went carefully through
51:27the material of the classes that depend
51:29on us on 61c y um and you know homework
51:33eight you know if you don't do it if you
51:35don't retain any of that material on
51:37virtual memory you're not going to have
51:39any good time in 152 or 16 you to take
51:42one I mean yeah yeah that's not going to
51:45work right but homeworks 9 and 11 I
51:49think that those are reasonably cover
51:51from scratch and any anywhere else where
51:54they depend on us um
51:58and there was also so there there two
51:59questions um so the the labs truly
52:03optional like homework what we're going
52:04to say is the labs are a place for you
52:07to learn the material deeper so the labs
52:09are things where your the labs are not
52:13being checked off you're not being
52:15graded for them but the material that's
52:17this is important we're distinguishing
52:19what we did with the labs with the
52:20homework homework again you don't have
52:21to do it you can Ace the exam I would
52:24say not true for the labs I would say
52:26you need to go through the labs to learn
52:28them to do that what's different is you
52:30don't have to do the labs that week that
52:32was the difference and you don't ever
52:33have to show us at all if you went
52:34through the labs and eventually learned
52:36the material that's going to show up on
52:38the exam the labs are not optional it's
52:40a good question to ask the labs are not
52:42optional in terms of the material still
52:44covered that material is a great
52:46exercise it's great practice and that is
52:48going to be then tested so it's not
52:49going to say well what do we do on the
52:50lab page 14 we won't do that but to
52:52learn the material in a deeper richer
52:54way that then would be there so it's not
52:56something you have to oh my gosh there's
52:5819 things do this week no relax it it's
53:01not something you have you never need to
53:02show us we just know but we encourage
53:04you to do it we encourage you to ask
53:06questions to your Tas and to your staff
53:07about it but we're never going to force
53:09you to do it by a deadline but that
53:11material is still on exams again never
53:14directly from what's on line 14 but that
53:16material is how you go deeper into the
53:18material you maybe example caches
53:20there'll be some problems on caches
53:21you'll do in labs and it might be an
53:23exam question that's very similar or not
53:25at all similar but you are learning
53:26about caches there and caches are
53:28certainly on the exam so that's the idea
53:30so labs are truly optional in the sense
53:31of not having to show us anything but
53:33the material is covered unlike homeworks
53:35where that material isn't covered the
53:37lecture will be fine that's all you need
53:39for this there
53:41um and the we're not sure if we need to
53:43do a midterm retake should we expect an
53:44email soon there's only emails I'm going
53:46to wait for this is why I think we might
53:48need to be delaying the midterm retake
53:50is we need to be looking at students
53:53grades and how they did and whether they
53:55need to do it again and I need to be
53:57reading I need to take the time to read
53:58all the you know all the little
54:00something went wrong and I I read about
54:01it I make a I make a judgment call I did
54:03that for every single person who wrote
54:04something in the in the field and to do
54:06this again for again a thousand people
54:07so that's a lot of reading a lot of
54:09stuff and it might need and what happen
54:11for the queston it took so long was we
54:12had to get all the grades in then I had
54:14to read everybody then cross correlate
54:15them to decide who's doing it and then
54:17once I give the list I give you one more
54:18chance to say well I'm not on the list
54:20or I shouldn't be on I should either
54:21should be on the list or should not be
54:22on the list to find what the final list
54:24is all that took about four weeks so
54:27we're hoping the midterm doesn't delay
54:29that much but it looks like that's where
54:30we're all leaning but we want to make a
54:31final call we'll let you know uh soon
54:34about whether that's GNA happen that's
54:35the place okay sh thank you all what a
54:39good day I'm glad we had Sharon ker that
54:41was a great that was a great set of
54:42visits good stuff and then went went
54:44long but we actually didn't have any
54:45more than this this is my last slide
54:46before before we have our little ask us
54:49anything uh hope everybody had a safe
54:50Halloween by the way I I you know I
54:52didn't go anywhere but we dressed up I
54:54was I was our family was the characters
54:56from Among Us I know Bor did you family
54:57do anything for Halloween but it was
54:59lots of fun yeah you're B you're muted
55:02uh it was it was a good time mut myself
55:03because my son is practicing piano in
55:05the other room oh okay that's that's
55:08okay all right I we didn't do anything I
55:11mean really my son went and you know
55:13they had a closed uh Court um uh trick
55:18and tree thing you know five houses
55:19organiz little houses that's yeah small
55:22thing yeah yeah yeah that's great so it
55:24was you know all set up no no surprises
55:27over my my my uncle went went my uncle
55:30lives in New York and he bought you know
55:31he said he showed on Facebook he bought
55:33hundreds of pieces of candy wrapped them
55:35all you know zip locks you know sprayed
55:37them wiped them all down he had like 200
55:40things ready for all the kids 10 people
55:42came by had 200 things to give away
55:45nobody came you know it's a little crazy
55:48but people are staying safe I'm glad
55:49people people are staying safe and that
55:52is you know that's the red call I think
55:53it's just hard for younger kids I think
55:54is it all right folks this is a good
55:57week go ahead ahead finish up we we have
56:00a so next week visitors are from Apple
56:02uh so get your questions ready and I
56:05think if we are ready they may give out
56:08some prizes we'll find out if depends on
56:10us how if we can get the grading done
56:13that's exciting good stuff and then and
56:16just you asked him about any internships
56:18and stuff like that back then jobs
56:20whatever you need wonderful wonderful
56:23and also next week we close up VM and we
56:25start TLP thread level processing so
56:28we'll we'll we'll talk about that next
56:30week and uh uh we'll talk about threads
56:32and how to do things in parallel that'll
56:34set you up very well for your project
56:35four um one last word your vote counts
56:39please do vote folks we put it on the
56:40first slide we'll put in every slide on
56:42the top right please do vote if you
56:44haven't uh look to all of us especially
56:46if you are outside of California it work
56:49it's worked a lot more than our votes
56:51that's a good point that's a good point
56:52yes indeed good stuff all right folks
56:55all right take care bora's son is gonna
56:57take us off with the little piano eude
56:59to take us home here all right thank you
57:01good stuff everybody take care folks all
57:03right bye
57:05bye

About this transcript

This page contains the full transcript of [CS61C FA20] Weekly Lecture 11.LIVE - OS, VM, & I/O by CS 61C Departmental, generated from the public captions YouTube serves with the video. The transcript has 11,855 words across 1,587 segments, with the original timestamps preserved so you can click any line to jump to that moment in the embedded player.

What you can do with it

Use the transcript to take notes, quote the speaker, build a study guide, generate a summary with ChatGPT or Claude via the YouTube Summary tool, or export it as a timed subtitle file with YouTube to SRT. You can also re-open it in the transcriber to translate the transcript into 100+ languages.

Free YouTube transcript tool

YouTube2Text is a free YouTube transcript generator — no signup, no daily limit. Paste any YouTube link and get the full transcript instantly, with timestamps, click-to-jump, translation to 100+ languages, AI prompts for ChatGPT, Claude, and Gemini, and exports to TXT, SRT, VTT, or Markdown.