[torqueusers] calculating cpu time

Glen Beane beaneg at umcs.maine.edu
Tue Oct 11 11:58:05 MDT 2005



On Tue, 11 Oct 2005, Doug Smith wrote:

> This is a basic question but I seem to be getting conflicting answers 
> from people.
> 
> When defining a queue in qmgr setting resources_max.cput = 24:00:00 
> should set the maximum amount of cpu time a job can have right?  Is this 
> a per CPU setting or a general cpu time setting? Meaning if I submit a 
> job to 16 processors should it run for 1.5 hours (24hours/16processors) 
> or will it run for 24 hours on each cpu?

24 hours cumulative.  Assuming all processes are under torque's control.

> 
> I have gotten conflicting answers to this question.
> 
> And what if any relation does resources_max.wallclock have to this 
> issue? I was under the impression that wallclock time meassured the time 
> from when a job was submitted to when it terminated. If you set 
> resources_max.wallclock = 48:00:00 a job could be in the system for 48 
> hours in what ever stat E Q R... but that 48 hours after it was 
> submitted it was going to get terminated by the scheduler/resource manager.
> 
> Is this correct?

48 hours in the R state.  It could be in the Q state for 2 years -
walltime has no relation to Q time.

> 
> jds
> 
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