[Distributed_systems] week 7

[Lukács Dániel]

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
>>>>>>>>
>>>>>>     
>>>>>>     
>>>>>>
>>>>>>
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>>>>>> https://plc.inf.elte.hu/mailman/listinfo/distributed_systems
>>>>>     
>>>>>     
>>>>>
>>>>>
>>>    
>>>    
>>>
>>>
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