[Darshan-users] darshan and fluent

[Harms, Kevin N.]

Thomas,

  I don't know anything about fluent, but you might inquire what
interfaces they use for I/O.
  I would check to see what part of the executable you are running is
dynamically linked as well.

  ldd <binary name>
    will show what libraries are pulled in via dynamic linking.

kevin

>Hi,
> 
>I try to use darshan to profile the IO of fleunt.
>For that I do
> 
>export LD_PRELOAD=
>/scratch/tgeenen/build/darshan-runtime-icc14.0/lib/libdarshan.so
>and run fluent
>fluent -mpi=intel -g 3ddp -t2 -i journal_lowb
> 
>this does not work.
>After looking into it a bit more carefully I found that in the script
>ansys/15.0.5/v150/fluent/fluent15.0.0/multiport/mpi_wrapper/bin/mpirun.fl
>LD_PRELOAD Is overwritten
>So I hacked it a little,
>FS_MPIRUN_FLAGS="$FS_MPIRUN_FLAGS -genv LD_PRELOAD $LD_PRELOAD"
> 
>Now I get some results but it seems that not all IO is intercepted.
> 
>[tgeenen at ln001 30]$ darshan-job-summary.pl
>tgeenen_fluent_mpi.15.0.0_id24021_7-30-52184-13493803983035018749_1.darsha
>n.gz
>Slowest unique file time: 0
>Slowest shared file time: 0.001565
>Total bytes read and written by app (may be incorrect): 0
>Total absolute I/O time: 0.001565
>Warning: empty y range [0:0], adjusting to [-1:1]
>Warning: empty y range [0:0], adjusting to [-1:1]
> 
> 
>[tgeenen at ln001 30]$ darshan-summary-per-file.sh
>tgeenen_fluent_mpi.15.0.0_id24021_7-30-52184-13493803983035018749_1.darsha
>n.gz output_directory
>Status: Generating summary for file 1 of 1: thermo.db
>=======================================================
>Slowest unique file time: 0
>Slowest shared file time: 0.001565
>Total bytes read and written by app (may be incorrect): 0
>Total absolute I/O time: 0.001565
>Warning: empty y range [0:0], adjusting to [-1:1]
>Warning: empty y range [0:0], adjusting to [-1:1]
>=======================================================
>darshan-summary-per-file.sh done. Results can be found in
>output_directory/*.pdf.
>[tgeenen at ln001 30]$ ls output_directory/
>thermo.db.gz  thermo.db.pdf
> 
>seems that only io for thermo.db is captured
> 
>I posted a question with Ansys support but they seem to be not very
>familiar with darshan.
>I would be interested to understand if other users have experience with
>profiling fluent.
> 
>thanks
>Thomas Geenen
> 
>Project Lead High Performance Computing
> 
>HPC Application & Infrastucture Expert/Architect
>thomas.geenen at asml.com
>
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