Re: [HTCondor-users] ASSIGN_CPU_AFFINITY does not work as expected

[Anthony Tiradani <tiradani@xxxxxxxx>]

Your top output doesn't show which core the processes are using.  what 
does ps -aeF show?  The PSR column will show the last core that the 
process ran on.  You can also use taskset to determine cpu affinity.

Thanks,

Anthony Tiradani

On 12/09/2014 08:15 AM, qing wrote:
> Dear Condor Expert:
>
>    I am using condor 8.2.2 and from the manual I see that if we set
> 'ASSIGN_CPU_AFFINITY = True' for the STARTD daemon, then a
> multi-threaded job will not use more cores than the number it requests.
> I made a quick test but seems 'ASSIGN_CPU_AFFINITY = True'  does not work:
>
> 1. I added 'ASSIGN_CPU_AFFINITY = True' for the STARTD daemon, after
> that I restarted the condor daemon on node008.
> [root@node008 ~]# condor_config_val -dump | grep AFFINI
> ASSIGN_CPU_AFFINITY = True
>
> 2. I submit a 4 threads job to node008, but I assign 'RequestCpus = 1'
> in the submission file:
>
> [scotg001@node003 test]$ condor_submit submit.stress
> Submitting job(s).
> 1 job(s) submitted to cluster 41.
>
> [scotg001@node003 test]$ cat submit.stress
> Universe       = vanilla
> Executable     = stress.sh
> Output         = stress.out
> Log            = stress.log
>
> RequestMemory  = 1000
> RequestCpus = 1
> requirements  = ((Arch == "INTEL" || ARCH == "X86_64") && (machine
> =="node008"))
>
> Queue 1
>
>
> [scotg001@node003 test]$ cat stress.sh
> #!/bin/bash
> echo $HOSTNAME
> echo `date`
> stress --vm 4  --vm-bytes 800M --timeout 60s
>
>
> 3.  Condor shows that this job requires 1 cpu:
>
> [scotg001@node003 test]$ condor_history  41.0 -af RequestCpus
> 1
>
> but on node008 with top I can see the job is actually occupying 4 cores.
>   5232 scotg001  30  10  806m 767m  140 R 94.7  9.8   0:07.60 stress
>   5233 scotg001  30  10  806m 651m  140 R 94.7  8.3   0:07.48 stress
>   5230 scotg001  30  10  806m  15m  140 R 92.9  0.2   0:07.46 stress
>   5231 scotg001  30  10  806m 201m  140 R 92.9  2.6   0:07.54 stress
>
>   Any idea why 'ASSIGN_CPU_AFFINITY = True'  does not work as expected?
> I use partitionable slots but in 8.2.2 the previous bug should already
> be fixed.
>
>    Cheers,Gang
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