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<p>Hello everyone,</p>
<p>I enjoyed a lot working with installed darshan on HPC systems and I tried to install it on my Linux Ubuntu machine to profile posix related IOs.</p>
<p>Installation went fine using darshan 3.1.6<br>
</p>
<p>``` <span><br>
</span></p>
<p><span>./configure CC=mpicc --prefix <span>/home/jeremy/Devel/Darshan_try/</span> --with-mem-align=8 --with-log-path-by-env=DARSHAN_LOG_DIR --with-jobid-env=NONE</span></p>
<p><span>make && make install</span></p>
<p><span>```</span></p>
<p><span><br>
</span></p>
<p><span>Then I have intended to use darshan dynamic load mode with a sample program that write a file with 4k bytes:</span></p>
<p><br>
<span></span></p>
<p><span>```</span></p>
<p><span></p>
<div>include <fstream><br>
#include <cstdlib><br>
#include <mpi.h><br>
int main (int argc, char** argv) {<br>
MPI_Init (0, nullptr);<br>
std::ofstream output (argv[1], std::ofstream::binary);<br>
size_t size = atoi(argv[2]);<br>
char* buffer = new char[size];<br>
output.write (buffer, size);<br>
output.close();<br>
delete [] buffer;<br>
MPI_Finalize();<br>
return 0;<br>
}<br>
</div>
```</span>
<p></p>
<p><span>compiled with mpic++, backend compiler g++, mpi library: openmpi <br>
</span></p>
<p><span>```<br>
</span></p>
<p><span>mpic++ --std=c++14 my_program.cpp -o my_program</span></p>
<p><span>```<br>
</span></p>
<p><span>launched in a test.sh file:</span></p>
<p><span><br>
</span></p>
<p><span>```</span></p>
<p><span></p>
<div>#!/usr/bin/env sh<br>
current_path=`pwd`<br>
#export DARSHAN_LOGFILE=${current_path}/logs/darshan.log<br>
export PATH=${PATH}:/home/jeremy/Devel/Darshan_try/bin<br>
export DARSHAN_LOG_DIR=${current_path}/logs<br>
rm -rf ${current_path}/logs<br>
mkdir ${current_path}/logs<br>
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/jeremy/Devel/Performances/Darshan/example/<br>
export LD_PRELOAD=/home/jeremy/Devel/Darshan_try/lib/libdarshan.so <br>
# writing 4k bytes in a file<br>
mpirun -n 1 ./mpi_write_file test.txt 4000<br>
<br>
darshan-job-summary.pl ${current_path}/logs/*<br>
<span>```</span><br>
<span></span></div>
</span>
<p></p>
<p><span><br>
</span></p>
<p>the output of darshan-job-summary is the following:</p>
<p>```</p>
<p></p>
<div>This darshan log has no file records. No summary was produced.<br>
jobid: 3881<br>
uid: 1000<br>
starttime: Mo Okt 29 16:07:41 2018 ( 1540825661 )<br>
runtime: 1 (seconds)<br>
nprocs: 1<br>
version: 3.10<br>
<br>
</div>
<p></p>
<p>```<br>
</p>
<p><br>
</p>
<p>I don't really understand why there is no records for my file write of 4000 bytes, is there something I have done incorrectly ?</p>
<p>I have attached the darshan output file.</p>
<p><br>
</p>
<p><br>
</p>
<p>Best regards,</p>
<p>Jeremy.</p>
<p><br>
</p>
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