[Darshan-users] darshan and fluent

[Thomas Geenen]

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.darshan.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.darshan.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<mailto:thomas.geenen at asml.com>
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