[torqueusers] Is resources_used.mem reliable?

[Martin Thompson]

Hi there

I'm having some problems with the value of resources_used.mem as
provided by qstat -f.  Should I be able to rely on the accuracy of
this attribute?

I find that, in comparison to the output from top, resources_used.mem
is occasionally correct, but more often than not it reports a much
smaller value.  This happens with very simple single-cpu jobs and 
two-cpu OpenMP jobs.  Each of these jobs have very steady memory 
usage once they get up and running.

Our cluster is running SLES 9, with a vanilla 2.6.10 kernel, and
torque-1.1.0p4.  However, I have seen the same problem with 
torque-1.2.0p2.

Also, I extracted just enough code from torque-1.2.0p2 to call the 
resi_proc(int pid) function and it seems to report the correct value
every time.

Cheers.

Mart.