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World Community Grid Forums
Category: Completed Research
Forum: The Clean Energy Project - Phase 2 Forum
Thread: Most cores to crunch this project |
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Thread Status: Active Total posts in this thread: 22
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Bearcat
Master Cruncher USA Joined: Jan 6, 2007 Post Count: 2803 Status: Offline Project Badges: 
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Been doing only a couple wu's at a time. Now I plan on crunching 100% to get my sapphire. What's the most cores used without to much lost time between crunch time and actual time? From what I've read so far, 4 cores isn't to bad. Will be using my dual quad core (ubuntu 64) and a hex (win 7 64). Just don't want to loose to much time. I know this project is hard on the hard drives. Tnks
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Crunching for humanity since 2007!
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Dear Bearcat,
we usually don't see issues with 3-5 cores on a single hd. Beyond that, performance can start to drop. Here are some more detailed suggestions: http://cleanenergy.harvard.edu/documents/Tips_Tricks_CEP2_Custom_Settings.pdf Hope this helps. Thanks for supporting CEP! Best wishes from Your Harvard CEP team |
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Bearcat
Master Cruncher USA Joined: Jan 6, 2007 Post Count: 2803 Status: Offline Project Badges:
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Thanks. Pretty much what I'm doing now.
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Crunching for humanity since 2007!
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Bearcat
Master Cruncher USA Joined: Jan 6, 2007 Post Count: 2803 Status: Offline Project Badges:
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Win7 seems to handle 4 at a time fairly well with only a few minutes different between CPU and actual time. Ubuntu gets hit with 10 to 15 min difference.
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Crunching for humanity since 2007!
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
and if we have 24 cores , how many process do you recommend on a single 10K RPM Disk ? (the OS is Kubuntu 11.10 on EXT4)
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Dear warmachine,
that is an unusual setup with lots of cores but only one (albeit fast) hd. We don't have experience with such a constellation but we'd try 10 CEP2 processes - if you observe an I/O bottleneck you can decrease it, if not increase it. Best wishes Your Harvard CEP team |
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LCB001
Advanced Cruncher CANADA Joined: Oct 14, 2009 Post Count: 69 Status: Offline Project Badges: 
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I've run up to 11 CEP processes in combination with other WCG projects on a dual-quad (2x E5520 @3.74GHZ Win7) for stability testing purposes without running into to any significant HDD thrashing on a WD640 Black.
----------------------------------------Having lots of fast RAM (12GB) seemed to make more of an impact than anything else. That was awhile ago though so I can't provide any recent efficiency numbers...  [Edit 1 times, last edit by LCB001 at Oct 21, 2011 12:18:20 AM] |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
ok thanks for your feedback
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Bearcat
Master Cruncher USA Joined: Jan 6, 2007 Post Count: 2803 Status: Offline Project Badges:
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Let us know how the raptor does. I was doing 6 at a time on dual quad E5640 with hyperthreading off and got around 10 minute difference between CPU time and actual time. The hard drive was a 1gb hitachi. Went back to mixing this project with HCC to lower the difference in time. Am back to 14 threads though doing this now.
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Crunching for humanity since 2007!
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Bearcat
Master Cruncher USA Joined: Jan 6, 2007 Post Count: 2803 Status: Offline Project Badges:
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Bumped it up to 10 per day. Getting around 20 minute difference between CPU and actual time. Would extending the time to write to disk help calm this down?
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Crunching for humanity since 2007!
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