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@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@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@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

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