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World Community Grid Forums
Category: Completed Research
Forum: The Clean Energy Project - Phase 2 Forum
Thread: Elapsed time weirdness [RESOLVED] |
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Thread Status: Active Total posts in this thread: 34
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
Now I'm having a lazy moment. How to log top cumulative process info to a file. I just saw 6 briefly flash by on nFLT... watching it is tiring.
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WCG
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
After 2 days of pulling out what little of hair I have left, I think I may have tracked down the root cause of CEP2 not running at 100% CPU.
My setup: Intel 980x Host OS: Win 7 x64 Virtual machine: VirtualBox running Ubuntu 10.04.1 x64 Each machine has 6 CPU's being used by BOINC Here's a screenshot of Ubuntu running 6 HCC WU's. Resource monitor shows a nice flat line at 100% as it should.  Here's a screenshot of it running 6 CEP2 WU's. Resource monitor shows large dips in CPU useage at random intervals. Sorry for the BOINC message overlaying Memory and Swap history...lol!  And here is what I believe to be the culprit: huge bursts of hard drive I/O activity! I put several resource monitors all on one screen and watched for a while. The dips in CPU useage correspond with bursts in disk activity coming from CEP2.  |
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
Yes, unfortunately as it is BOINC does not take this disk I/Oing into account, a reason that I'm persisting to run mix not to stretch the envelope and push more to the slowest element of a system... the HD. Was reading about moving the Linux swapfile to memory, for now reciding in it's own partition on the fastest drive. That's no option for me though at 4Gb cap... just set the BOINC RAM permission to max use by BOINC, 90% during use, 100% when idle, which then keeps it during idle time in bounds. Losses continue to range from 20-45 minutes per task.
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WCG
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Dark Angel
Veteran Cruncher Australia Joined: Nov 11, 2005 Post Count: 728 Status: Offline Project Badges: 
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If you're running 64bit Linux then you can use a LOT more than 4GB or RAM. If you don't mind recompiling your kernel, or installing a server edition rather than a desktop one (you can install the desktop stuff on Ubuntu Server quite easily if you want to), you can use more than 4GB or RAM in 32bit Linux as well.
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