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Hi Uli,
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<div class="">As a matter of fact not a lot changed in our mpi-implementation:</div>
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<div class="">- There is only the mother-process to do things like pick up parameters or mkdir etc. So the most probable situation is that the binary was in fact not mpi-capable when launched through mpirun.</div>
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<div class="">The easiest way to check is through ./instrument.out </div>
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<div class="">./ILL_IN4.out --help</div>
<div class="">ILL_IN4 (ILL_IN4.instr) instrument simulation, generated with McStas 2.5 - Dec. 12, 2018 (Dec. 12, 2018)</div>
<div class="">Usage: ./ILL_IN4.out [options] [parm=value ...]</div>
<div class="">Options are:</div>
<div class=""> -s SEED --seed=SEED Set random seed (must be != 0)</div>
<div class=""> -n COUNT --ncount=COUNT Set number of neutrons to simulate.</div>
<div class=""> -d DIR --dir=DIR Put all data files in directory DIR.</div>
<div class=""> -t --trace Enable trace of neutrons through instrument.</div>
<div class=""> -g --gravitation Enable gravitation for all trajectories.</div>
<div class=""> --no-output-files Do not write any data files.</div>
<div class=""> -h --help Show this help message.</div>
<div class=""> -i --info Detailed instrument information.</div>
<div class=""> --format=FORMAT Output data files using FORMAT=MCSTAS</div>
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<div class="">This instrument has been compiled with MPI support.</div>
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<div class="">… etc.</div>
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<div class="">The above line will not be present in case the instrument is not compiled with MPI.</div>
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<div class="">The only thing that comes to mind in terms of changes is that our two mcrun variants differ in how one specifies to compile with mpi, in the sense that</div>
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<div class="">Perl:<span class="Apple-tab-span" style="white-space:pre"> </span>mcrun.pl -c --mpi is enough</div>
<div class="">Python:<span class="Apple-tab-span" style="white-space:pre"> </span>
mcrun -c --mpi=some_integer (i.e. --mpi needs a. value)</div>
<div class="">(For the full list of differences, see <a href="https://github.com/McStasMcXtrace/McCode/wiki/mcrun-variants---table-overview" class="">https://github.com/McStasMcXtrace/McCode/wiki/mcrun-variants---table-overview</a> </div>
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<div class="">From the (python) gui, the easiest is to use “MPI (recompile)” from the run dialogue. </div>
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<div class="">Also remember that if you inadvertently make a change in the .instr code, then a save and exiting mcgui, the automatic recompile (since now the .instr code is newer than the .c code) may do a non-mpi compile for you.</div>
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<div class="">Finally, our recommended “standard” MPI to use is OpenMPI, but MPICH should be just as good.</div>
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<div class="">Hope this helps, otherwise write again - but expect some delay as I now started my summer vacation. ;-)</div>
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<div class="">Cheers,</div>
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<div class="">Peter</div>
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<blockquote type="cite" class="">
<div class="">On 19 Jul 2019, at 17.18, Wildgruber, Christoph U. <<a href="mailto:wildgrubercu@ornl.gov" class="">wildgrubercu@ornl.gov</a>> wrote:</div>
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<div class="">Hi,<br class="">
<br class="">
I am having a problen (mpi-) running mcstas 2.5 on centos 7.? with more than 1 node.<br class="">
It looks like every node tries to create the target directory wether I start from mcgui or<br class="">
use the mcrun command in the terminal. The location of the output directory does not<br class="">
seem to matter. I am using mpich on a newly installed OS<br class="">
and don’t remember having had that problem before.<br class="">
The 2.5 manual mentions new options but I did not find anything wrt this problem.<br class="">
What am I missing? <br class="">
<br class="">
Thanks,<br class="">
<br class="">
Uli<br class="">
_______________________________________________<br class="">
mcstas-users mailing list<br class="">
<a href="mailto:mcstas-users@mcstas.org" class="">mcstas-users@mcstas.org</a><br class="">
https://mailman2.mcstas.org/mailman/listinfo/mcstas-users<br class="">
</div>
</div>
</blockquote>
</div>
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<br class="">
Peter Kjær Willendrup<br class="">
Forskningsingeniør, Specialkonsulent<br class="">
Næstformand for DTU Fysik LSU<br class="">
<br class="">
DTU Physics<br class="">
<br class="">
</div>
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