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World Community Grid Forums
Category: Completed Research
Forum: Help Stop TB
Thread: Can't run full blast on my 32 core machine (64 threads) |
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Thread Status: Active Total posts in this thread: 23
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
I wonder if it doing something to the on-chip cache. If you shutdown to 32 (match actual physical cores) does it go to 100%. Just a thought...
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LCB001
Advanced Cruncher CANADA Joined: Oct 14, 2009 Post Count: 69 Status: Offline Project Badges: 
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Seeing the same thing as Anhhai and Nanoprobe on a dual AMD 6272 (32core).
----------------------------------------These HSTs remind me a lot of the LLR wus from PrimeGrid which use a lot of level3 cache. If you try to run too many of those at the same time the cache fills and it has to use some of the regular Ram as cache which slows it all down. PrimeGrid actually recommends disableing hyperthreading or only using half your cores/threads for that reason. YMMV...  |
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nanoprobe
Master Cruncher Classified Joined: Aug 29, 2008 Post Count: 2998 Status: Offline Project Badges:
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Nanoprobe, Sorry, guess I wasn't clear. It got to 96% because I was only running 34-35 HSTB WU, rest were UGM. It was 96% before I restarted it and was still 96% right after I restarted it, this suggest that the check pointing isn't the issue. edit: Sorry, English isn't my first language Understood. I can get to 100% with a 50/50 HST1/OET1 load or running only OET1. Running only HST1 and the CPUs max out at 56%.
In 1969 I took an oath to defend and protect the U S Constitution against all enemies, both foreign and Domestic. There was no expiration date.
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Found this in the Gromacs install guide:
For versions 4.5.x, threading is enabled by default - this is incompatible with MPI, so choose one or the other. Threading is useful only when all your cores are real (i.e. not hyper-threading) and do not need any network to communicate. Whether that is related to what you are seeing or not, don't know. Techs will probably have to weigh in... |
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enels
Senior Cruncher Joined: Apr 25, 2008 Post Count: 286 Status: Offline Project Badges: 
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It doesn't appear HST1 WUs use more than 1 thread. So Gromacs threading probably isn't enabled.
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SekeRob
Master Cruncher Joined: Jan 7, 2013 Post Count: 2741 Status: Offline |
Ibercivis uses gromacs too so maybe their forums carry some discussion.
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
It doesn't appear HST1 WUs use more than 1 thread. So Gromacs threading probably isn't enabled. You are correct: Using 1 MPI thread |
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kinski
Advanced Cruncher Joined: Nov 25, 2006 Post Count: 104 Status: Offline Project Badges: 
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I dont see any issues with CPU usage being abnormally low on my 2P L5640 and E5649 crunchers. Both Ubuntu 15.10 x64.
----------------------------------------http://i.imgur.com/0xNwWBU.png http://i.imgur.com/pIFkr4W.png Neither on Win7x64 1P E5-2675v3. http://i.imgur.com/wRfgVED.png  |
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enels
Senior Cruncher Joined: Apr 25, 2008 Post Count: 286 Status: Offline Project Badges:
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24 threads is a lot less than 64, but your efficiency looks really good [xs]anubis. Are you using SSDs?
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nanoprobe
Master Cruncher Classified Joined: Aug 29, 2008 Post Count: 2998 Status: Offline Project Badges:
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Efficiency is fine as long as I don't try to run all threads on HST1.
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In 1969 I took an oath to defend and protect the U S Constitution against all enemies, both foreign and Domestic. There was no expiration date.
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