[MITgcm-support] question about TIMER stats breakdown

[Martin Losch]

Hi Dan,

Constantinos once answered a similar question here:
<http://mitgcm.org/pipermail/mitgcm-support/2009-July/006141.html>

There’s a little more to find with a google search like this: 
site:mitgcm.org/pipermail system time
but I’ll let you browse the results yourself.

Martin


On Mar 11, 2014, at 11:22 PM, Daniel Goldberg <dngoldberg at gmail.com> wrote:

> Hi All
> 
> Apologies if this is made clear in the documentation.
> 
> I am wondering about the system time/user time breakdown of the TIMER stats. Might it vary from machine to machine what is considered "system time" or is it pretty standard? My understanding is that system time refers to time spent in kernel code rather than user code, but I'm wondering if that's generalized e.g. to external libraries, such as PETSc, or if my long system times are due to slow MPI exchanges (in the particular S/R I am looking at there are no file reads or writes, save writing to STDOUT).
> 
> Thanks very much
> Dan
> 
> -- 
> 
> Daniel Goldberg, PhD
> Lecturer in Glaciology
> School of Geosciences, University of Edinburgh
> Geography Building, Drummond Street, Edinburgh EH8 9XP
> 
> 
> em: Dan.Goldberg at ed.ac.uk
> web: http://ocean.mit.edu/~dgoldberg
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