[Distributed_systems] ?==?utf-8?q? week 7

Tue Mar 31 21:04:57 CEST 2020

 Dear All,

I rephrased Robi's exercises to make them more talkative and gave a what-to-do.
Solutions are next to them under my branch.

Peter, please, check them. I have not reviewed all of them (two junior colleagues were allocated to solve them).

I hope, at the end of this semester, we have a full exercise list with handsout and so.

Thank you,
Mark

2020 Március 31, Kedd 16:38 CEST dátummal, Lukács Dániel <dlukacs at caesar.elte.hu> ezt írta: 

> Dear Márk,
> 
> Thank you for contributing all this! Yes, your branch is a good choice 
> for this kind of content!
> 
> Dániel
> 
> 
> On 3/31/20 2:18 PM, Török Márk wrote:
> > Dear All, Dani,
> >
> > As mentioned previously I push my solutions for the first three topics (basics, socket, multithreading).
> > I reviewed some of them, but not all of them. Since not decided which one should be assigned to which folder,
> > I will push all of them under my branch (tmark) as I have finished my work.
> >
> > Peter, please, take a look at them, hope they can help you, inspire you, or even all the multithreading socket topic could be covered by them.
> >
> > Mark
> >
> >   
> >   
> > 2020 Március 31, Kedd 12:52 CEST dátummal, Lukács Dániel <dlukacs at caesar.elte.hu> ezt írta:
> >   
> >> Hi Márk,
> >>
> >>
> >> I've seen the change, this is what I referred to as "new counter". Even
> >> there, I can only reproduce race conditions (since counter += 1 is not
> >> atomic), but what I hoped too see is that a thread consistently works
> >> with an old (cached) value of the non-volatile variable. But my solution
> >> doesn't work for me either. Maybe my OpenJDK doesn't do caching. Not
> >> sure if it's required by the JVM specs.
> >>
> >>
> >> Video: See MS Stream in my other mail. You can use your INF account to
> >> upload there. Did you mean something like that?
> >>
> >>
> >> I introduced some system in the repo, please see the timeline and update
> >> your local copy. The handout (neither mine or yours) doesn't have any
> >> info about wait/notify. Do you have some time to upgrade the Hungarian one?
> >>
> >>
> >> Dániel
> >>
> >>
> >> On 3/31/20 11:33 AM, Török Márk wrote:
> >>>    
> >>> Hi Dani,
> >>>
> >>> Yesterday I changed the exercise regarding volatile.
> >>>
> >>> Is it possible to arrange a storage place for videos where we can see video streaming?
> >>> It would be a nice approach if we can use the videos in the next semesters as well.
> >>>
> >>> If we use teams for this, we should add students to the same course in every semester to use the same video.
> >>> Do we have a video portal where we can upload videos and videos are available like in youtube or any other kind of video sharing portal?
> >>>
> >>> Mark
> >>>    
> >>> 2020 Március 31, Kedd 00:15 CEST dátummal, Lukács Dániel <dlukacs at caesar.elte.hu> ezt írta:
> >>>    
> >>>> Done, but I still cannot seem to reproduce memory inconsistency neither
> >>>> with mine or your new counter. For me, reads and writes in your counter
> >>>> code are always in proper "happens-before" order even without volatile :/
> >>>>
> >>>> Maybe it's platform specific (is it?). If it works for you it's fine.
> >>>>
> >>>>
> >>>> On 3/30/20 8:47 PM, Török Márk wrote:
> >>>>
> >>>>> Hi Dani,
> >>>>>
> >>>>> Can you please add some solutions for the last exercise of week7?
> >>>>>
> >>>>> Thank you,
> >>>>> Mark
> >>>>>     
> >>>>>     
> >>>>> 2020 Március 30, Hétfő 20:30 CEST dátummal, Török Márk <tmark at caesar.elte.hu> ezt írta:
> >>>>>     
> >>>>>> Hi All,
> >>>>>>
> >>>>>> Do we have a streaming server? Where can we store these videos and how can we make them available for students?
> >>>>>>
> >>>>>> Thank you,
> >>>>>> Mark
> >>>>>>     
> >>>>>>     
> >>>>>> 2020 Március 30, Hétfő 14:25 CEST dátummal, Lukács Dániel <dlukacs at caesar.elte.hu> ezt írta:
> >>>>>>     
> >>>>>>> Hi!
> >>>>>>>
> >>>>>>> That's awesome! :) I think most of us are new to this, so it's still all
> >>>>>>> experimental.
> >>>>>>>
> >>>>>>> The length should be around 20 minutes. Maybe less, but definitely not
> >>>>>>> more.
> >>>>>>>
> >>>>>>> I guess the topic is mostly up to you (until it's multithreaded servers
> >>>>>>> :)), but if you need a plan:
> >>>>>>>
> >>>>>>>      * The *video* could be some theory intro and a demo about moving from
> >>>>>>>        iterative server to multithreaded server. (With iterative server,
> >>>>>>>        one client has to wait until the other client finished
> >>>>>>>        communication. Threads can solve this problem.) If you don't want to
> >>>>>>>        code everything from scratch, it may be a good idea to create a
> >>>>>>>        supplementary handout and refer to that in the video.

> >>>>>>>      * During class they could implement Robi's chat server and chat client
> >>>>>>>        during *class*. They will need a detailed assignment text for this.
> >>>>>>>        As Robi said, a demo (or written instruction) could be necessary
> >>>>>>>        here if there are difficult or unexpected or tricky operations.
> >>>>>>>      * Finally, they could solve Robi's HTTP server for *homework*. They
> >>>>>>>        will need a detailed assignment text for this.
> >>>>>>>
> >>>>>>> If they have this down, then week 9 could be about implementing
> >>>>>>> ping-pong and avoiding deadlocks.
> >>>>>>>
> >>>>>>> Is it realistic for you to finish the video until Thursday night? We
> >>>>>>> could then review it on Friday and publish it, so students would have
> >>>>>>> time to watch it during the weekend.
> >>>>>>>
> >>>>>>> Bests,
> >>>>>>>
> >>>>>>> Dániel
> >>>>>>>
> >>>>>>>
> >>>>>>> On 3/30/20 10:17 AM, Grünwald Péter wrote:
> >>>>>>>> Sziasztok!
> >>>>>>>>
> >>>>>>>> Hát ilyen videót még nem csináltam, de megpróbálom.
> >>>>>>>> Milyen hosszú legyen?
> >>>>>>>> Milyen témákat tárgyaljon pontosan?
> >>>>>>>>
> >>>>>>>> Üdv,
> >>>>>>>> Péter
> >>>>>>>>
> >>>>>>>> On Sun, Mar 29, 2020 at 1:16 PM Lukács Dániel <dlukacs at caesar.elte.hu
> >>>>>>>> <mailto:dlukacs at caesar.elte.hu>> wrote:
> >>>>>>>>
> >>>>>>>>        Dear All,
> >>>>>>>>
> >>>>>>>>        No one signed up yet for preparing teaching materials for week 8 (the
> >>>>>>>>        one starting on April 6). The topic is Multithreaded client-server 1.
> >>>>>>>>
> >>>>>>>>        I would do it because new topics are usually easier, but I'm already
> >>>>>>>>        working on the large assignment :(
> >>>>>>>>
> >>>>>>>>        Péter, is it possible for you to prepare the materials for week 8?
> >>>>>>>>
> >>>>>>>>        Dániel
> >>>>>>>>
> >>>>>>     
> >>>>>>     
> >>>>>>
> >>>>>>
> >>>>>> _______________________________________________
> >>>>>> Distributed_systems mailing list
> >>>>>> Distributed_systems at plc.inf.elte.hu
> >>>>>> https://plc.inf.elte.hu/mailman/listinfo/distributed_systems
> >>>>>     
> >>>>>     
> >>>>>
> >>>>>
> >>>    
> >>>    
> >>>
> >>>
> >   
> >   
> >
> >