On 06/27/2014 11:04 AM, Matthieu Dorier wrote:
> Hi Darshan users/dev
>
> I would like some precisions about the first graph in the darshan pdf
> summary (see attached for example).
> There are two bars, one for POSIX and one for MPI-I/O. So if I
> understand correctly, MPI-I/O calls in the POSIX bar will appear in
> purple (label "other"), and so will the POSIX operations in the
> MPI-I/O bar, correct?
>
Hi Matthieu,
Not exactly. An example might be the best way to clarify. Imagine a
job that runs for 100 seconds. It does an MPI_File_Write for 50
seconds, and that MPI_File_write internally calls a POSIX write for 25
seconds. The MPI graph will be 50% green and 50% purple. The POSIX
graph will be 25% green and 75% purple.
Since the POSIX operation was generated as a step within the MPI-IO
operation, it will count towards the MPI-IO write time in the MPI-IO graph.
If you wanted to find out how much time was spent by MPI-IO *not*
including the POSIX operations, then you will have to subtract that out
manually. We don't have a graph showing that.
thanks,
-Phil
> Thanks,
>
> Matthieu Dorier
> PhD student at ENS Rennes
> http://people.irisa.fr/Matthieu.Dorier
>
Hi Darshan users/dev
I would like some precisions about the first graph in the darshan pdf summary (see attached for example).
There are two bars, one for POSIX and one for MPI-I/O. So if I understand correctly, MPI-I/O calls in the POSIX bar will appear in purple (label "other"), and so will the POSIX operations in the MPI-I/O bar, correct?
Thanks,
Matthieu Dorier
PhD student at ENS Rennes
http://people.irisa.fr/Matthieu.Dorier
Dear Darshan users,
I encourage those of you who use Darshan-Ruby to update the gem to the 1.1.4 version (working with darshan-2.2.9-pre1 and more recent versions). A bug was found in Darshan-Ruby versions 1.1 to 1.1.3 that affects the values returned for fcounters (floating point values were mistakenly converted into integers).
Best,
Matthieu Dorier
PhD student at ENS Rennes
http://people.irisa.fr/Matthieu.Dorier
