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Posts by Exar Kun [HoloNet]

21) Message boards : Application Code Discussion : GPU app teaser (Message 11369)
Posted 18 Feb 2009 by ProfileExar Kun [HoloNet]
Post:
I noticed something strange of the website (zslip.com) : the link for the ATI GPU app is labeled "Windows optimized apps (0.17 - latest, cuda)".

Cuda ?
22) Message boards : Application Code Discussion : GPU app teaser (Message 11038)
Posted 16 Feb 2009 by ProfileExar Kun [HoloNet]
Post:
max_ncpus back to "1".

avg_ncpus set to 0.25. If I keep the default value of 0.50, I have only three WU running at the same time : two optimized MW and one World Community Grid. With avg_ncpus to 0.25 I have four workunits (two for each project)

Travis > thank you very much for your answer about the credits, it's a very good news. For maximum number of units per core, I can say that : with a Core2Duo and a HD4850 512Mo, I crunched 2000 workunits in 6 hours (with no other projet running at the same time, so the CPU wasn't at full use). So 4.000 workunits per core and day will be enough for this configuration (my computer is working "only" 12 hours per day or so, so 4.000 WU per core and day is the very, very maximum). I don't know how many workunits can be crunched with another model of ATI.

Cluster > If I understand correctly, your optimization uses "only" one core at a time, is that right ? Is it possible to use more core, so we can use only Milkyway on one computer with more than one core ?

Do you need something special to help you for your tests ?

PS : during this writing I reached my 2.000 workunits limit - later than before, probably because I tried avg_ncpus to 0.10 ...
23) Message boards : Application Code Discussion : GPU app teaser (Message 11007)
Posted 16 Feb 2009 by ProfileExar Kun [HoloNet]
Post:
avg_ncpus set to 0.1

max_ncpus set to 3 (core2duo)

Seems to work very fine, the Milkyway units are still completed in 8 or 10 seconds. It's the same time when I used 0.50 core, is it "normal" ?

Too bad we have the 1000 workunit-per-cpu limit, is it possible to send a request somewhere to remove this limit when using an optimized app ? This limit is now obsolete when you can calculate 3 or 4 times more units in a day with an optimized app. The only reason I'm moving a computer on milkyway is to help you for your excellent work on ATI graphic cards, but the credits are not very interesting ^^

THank you for this app, anyway ^^
24) Message boards : Application Code Discussion : GPU app teaser (Message 10682)
Posted 14 Feb 2009 by ProfileExar Kun [HoloNet]
Post:
How have you guys installed the BOINC client?
In the protected mode under Vista the application may not have the necessary access rights. CUDA apps also fail when tried to run in such a scenario. On XP64 and Server2003 it should also run in the protected mode.

If also the people where it runs could report on this?


Default options for me on Vista64, so I think I used the protected mode. It worked very fine until the 2000 WU limit. I earned 1939 credits in 6 hours. Only three WU went wrong during the initial tests, but it was my fault ^^
25) Message boards : Application Code Discussion : GPU app teaser (Message 10654)
Posted 14 Feb 2009 by ProfileExar Kun [HoloNet]
Post:
Works fine on my E7200 2.53 GHz & HD4850. I get about 300 credits per hour, with four workunits at the same time (Core2Duo).

Thanks for the feedback on the Vista64 issue.
The credits you get are less than a Quadore with an optimized CPU app gets (432credits/hour). Furthrmore you can't let it run for 24h a day. After about 6 hours you have used up your WU limit of 1000 WUs per day and core and that will earn you less than 2000 credits a day.
So you should definitely run another project at the same time. The MW GPU app uses only one core no matter how many WUs run concurrently. The work done for MW won't change, if you run it only with 50% resource share (2 WUs at the same time). Just try it!


Thank you very much for this information ^^

I tried a few hours ago to (re)join my main project (World Community Grid), but I stopped when I saw "only" two MW workunits instead of 4 before ^^ But the 1000 Wu limit per day change everything ^^

Question : if the GPU app uses only one core, is it possible to use the other core for a CPU-optimized app ? Or use all the cores with the GPU ?
26) Message boards : Application Code Discussion : GPU app teaser (Message 10651)
Posted 14 Feb 2009 by ProfileExar Kun [HoloNet]
Post:
Works fine on my E7200 2.53 GHz & HD4850. I get about 300 credits per hour, with four workunits at the same time (Core2Duo).


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