[GE users] Theoretical question about wallclock and qacct

reuti reuti at staff.uni-marburg.de
Tue Mar 3 18:49:00 GMT 2009

Am 03.03.2009 um 16:14 schrieb mhanby:

> I have a theoretical question regarding the number presented by qacct
> for WALLCLOCK. I'm running GE 6.1u5 with OpenMPI 1.2.8 compiled on the
> head node (so OpenMPI should be GE aware).
> As a test, I ran a 32 slot OpenMPI job that had a total runtime of 60
> minutes. The WALLCLOCK reported in the email delivered after job
> completion was 1:00:04 hours.
> The qacct command for that same job reports 18020, which translates  
> to ~
> 5:00:05 hours.

Is there only one record in the accounting file for this job? With a  
Tight Integration you should get 6 - one for the jobscript and one  
for each qrsh made.

> The job ran on 5 hosts, so it appears that the WALLCLOCK is only
> recording the seconds on each host and not each CPU / slot?
> Is this the way it's supposed to work, or is this a tight vs loose
> integration thing?
> I would have expected the WALLCLOCK for the 32 slot job to be ~  
> 32:00:00
> hours

For 6.2 it's an issue for the new ability to summarize the accounting  
records automatically:


Although it's still open to discuss to sum up the walltime at all.  
You could even argue that it should be just the time passed by, i.e.  
1 hr in your case. So upgrading woudn't help in yoru case anyway.

-- Reuti

> Thanks,
> Mike
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