[GE users] qacct WALLCLOCK interpretation

Greg Lukeman glukeman at stfx.ca
Tue May 29 18:39:43 BST 2007


Cool.  Thanks.  I'll probably use something like max(WALLCLOCK,CPU)  
for my reporting.

Is there any way I can prevent users from running multithreaded when  
they only ask for a serial slot?


On 29-May-07, at 1:02 PM, Rayson Ho wrote:

> If they are using more CPUs than SGE allocates them...
>
> eg. a multithreaded job (including OpenMP) submitted as a serial job
> running on an SMP machine.
>
> Rayson
>
>
>
> On 5/29/07, Greg Lukeman <glukeman at stfx.ca> wrote:
>> Hi All,
>>
>> As far as I understand (probably not far), when qacct reports
>> WALLCLOCK for a job, it sums up the ru_wallclock for each parallel
>> task.  Similarly when qacct reports CPU for a job, it sums up the cpu
>> for each parallel task.
>>
>> In what situations, then, could qacct show CPU greater than  
>> WALLCLOCK?
>>
>> I have some users for whom CPU is significantly (like 7x) greater.
>>
>> Cheers,
>>
>> Greg
>>
>>
>>
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