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Robby1959

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Message 67367 - Posted: 20 Apr 2018, 3:09:54 UTC

n body is using little cpu and run time is hitting 13 days . any ideas ?
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Profilemikey
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Message 67371 - Posted: 20 Apr 2018, 12:17:33 UTC - in response to Message 67367.  

n body is using little cpu and run time is hitting 13 days . any ideas ?


Pause the crunching and then resume it, if that doesn't help suspend it and then reboot the pc. If even that doesn't help you may just want to stop doing the n-body wu's until they figure out what the problem SOME people have running it.
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melk

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Message 67372 - Posted: 20 Apr 2018, 12:42:43 UTC

Are n-body tasks for CPU? I didn't realize that. I have lots of cpu hosts I can dedicate to it if so.
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ProfileJStateson
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Message 67373 - Posted: 20 Apr 2018, 14:21:52 UTC - in response to Message 67372.  
Last modified: 20 Apr 2018, 14:29:55 UTC

GpuGrid's quantum chemistry uses multiple CPUs but is Linux. I believe Amicable numbers also has a multiple cpu application.

Also, you cannot take the initial waiting time, that 13 days, literally. It takes a while to determine how efficient the system is and usually the time drops significantly. My problem is older core 2 quads that barely keep up with feeding the Milkyway GPU tasks. I also noticed that when first attaching, or re-attaching, one can pick up an n-body even if you have checked the "DO NOT USE CPU". I posted about this over at BOINC since it is their scheduler (I am guessing) that asks for tasks before it checks the venues, resources, or restrictions.
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melk

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Message 67374 - Posted: 20 Apr 2018, 14:45:53 UTC

Yeah I retired all my Core 2 Quads. Performance just isn't there for the energy cost. Even first gen Core is getting my stinkeye as I start to consolidate. Moving to Sandy as the bottom cutoff for desktop stuff. Found it's better still to just go multi-socket Xeon. LGA1366 is kinda iffy and is the bottom of what I will even consider. LGA20111 is plentiful and cheap on the used market.
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Robby1959

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Message 67376 - Posted: 20 Apr 2018, 15:51:40 UTC

thanks it used to run good cranked up the 4 core xeon'775 slot but lately low CPU usage and crawling . 12 days for one unit uugghh .right now I am running Gpu units .
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Message 67380 - Posted: 21 Apr 2018, 11:13:59 UTC - in response to Message 67374.  

Yeah I retired all my Core 2 Quads. Performance just isn't there for the energy cost. Even first gen Core is getting my stinkeye as I start to consolidate. Moving to Sandy as the bottom cutoff for desktop stuff. Found it's better still to just go multi-socket Xeon. LGA1366 is kinda iffy and is the bottom of what I will even consider. LGA20111 is plentiful and cheap on the used market.


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Message boards : Number crunching : n body crawling

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