[Darshan-users] Darshan & EPCC benchio different behaviour

[Harms, Kevin]

Piero,

  just to confirm, the serial case is still running in parallel, 36 processes, but the I/O is only from rank 0?

kevin

________________________________________
From: Darshan-users <darshan-users-bounces at lists.mcs.anl.gov> on behalf of Piero LANUCARA <p.lanucara at cineca.it>
Sent: Wednesday, February 5, 2020 4:56 AM
To: darshan-users at lists.mcs.anl.gov
Subject: Re: [Darshan-users] Darshan & EPCC benchio different behaviour

p.s

to be more "verbose" I add to the discussion:

Darshan output for the "serial" run (serial.pdf)

Darshan output for the MPI-IO run (mpiio.pdf)

benchio output for "serial" run (serial.out)

benchio output for "MPI-IO" run (mpi-io.out)

thanks

Piero

Il 04/02/2020 19:44, Piero LANUCARA ha scritto:
> Dear all
>
> I'm using Darshan to measure EPCC benchio benchmark
> (https://github.com/EPCCed/benchio) behaviour on a given x86 Tier1
> machine.
>
> running two benchio tests (MPI-IO and serial) a different behaviour
> appear
>
> while Darhsan pdf log file is able to recover the estimated time and
> bandwidth in the MPI-IO case, the "serial" run is completely
> underestimated by Darshan (the time and bandwidth are less/greater
> than benchio output).
>
> Suggestions are welcomed
>
> thanks
>
> Piero
>
> _______________________________________________
> Darshan-users mailing list
> Darshan-users at lists.mcs.anl.gov
> https://lists.mcs.anl.gov/mailman/listinfo/darshan-users