Message boards : ATLAS application : 4 CPUS tasks will not start on 4x Thread Processor (HyperThreading related)
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mike

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Message 33067 - Posted: 15 Nov 2017, 19:34:04 UTC
Last modified: 15 Nov 2017, 19:44:56 UTC

Hello,

I am receiving 4 CPUs tasks on my 2 CPUs processor that has HyperThreading enabled (2x Threads per CPU) which will result in an apparent 4 CPUs which are actually 4 Threads and I presume that is why the tasks that I receive remain forever in the state "ready to start".

Is there a solution to "force" them start ? Or is there a way to fetch only 2CPUs tasks ?

Thx.


Cpu: Intel Core i5-4210M
Ram: 8GB
OS: Windows 10, 64bit
Boinc version: 7.8.2

Update:
after 30min the status changed to "Waiting for memory"
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tullio

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Message 33070 - Posted: 16 Nov 2017, 9:27:17 UTC - in response to Message 33067.  
Last modified: 16 Nov 2017, 9:28:20 UTC

You have a small RAM. I am using only one CPU on 2 Linux boxes with 8 GB RAM, 2 CPUs on a Windows 10 PC with 22 GB RAM. The CPU, A10-6700, is sold as 4 cores but the Windows Task Manager sees 2 cores and 4 logical processors.
Tullio
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Profile Yeti
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Message 33071 - Posted: 16 Nov 2017, 22:19:33 UTC

Try my checklist: https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=4161


Supporting BOINC, a great concept !
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Crystal Pellet
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Message 33073 - Posted: 17 Nov 2017, 9:07:01 UTC - in response to Message 33067.  

Is there a solution to "force" them start ? Or is there a way to fetch only 2CPUs tasks ?

Go to your project preferences and set Max # jobs to 1 and Max # CPUs to 2 and ask new tasks.
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Profile HerveUAE
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Message 33076 - Posted: 18 Nov 2017, 20:07:53 UTC

Hi,

I am running 4-core tasks with 2 cores, HyperThreading and 8Gbytes RAM with no problems on that host: https://lhcathome.cern.ch/lhcathome/show_host_detail.php?hostid=10420599
My settings at LHC@Home preferences are:
- Max # jobs: 6
- Max # CPUs: 4
No specific app_config.xml file.
We are the product of random evolution.
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Jim1348

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Message 33077 - Posted: 18 Nov 2017, 20:26:33 UTC - in response to Message 33067.  
Last modified: 18 Nov 2017, 20:35:22 UTC

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Jim1348

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Message 33078 - Posted: 18 Nov 2017, 20:38:24 UTC - in response to Message 33076.  

You may not have enough memory. Try three cores per work unit.
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Message boards : ATLAS application : 4 CPUS tasks will not start on 4x Thread Processor (HyperThreading related)


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