How can I force Matlab system command to use a different mpiexec than its own?

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Marcel Beining
Marcel Beining 2017-10-27
评论： Andrea Michelotti 2021-9-27
I have to run another program from Matlab, which however has a parallel environment and thus uses the mpiexec. However, even though I installed Microsoft Open MPI, when I check which mpiexec will be used when running my program with the Matlab system command I get this:
[~,cmd] = system('where mpiexec')
cmd =
C:\Program Files\MATLAB\R2016b\bin\win64\mpiexec.exe
C:\Program Files\Microsoft MPI\Bin\mpiexec.exe
which means Matlab prioritizes its own mpiexec over Microsoft's. However I get errors with the one from Matlab, so I need the other one. I see when I check the path variable with getenv('PATH') there is no Matlab in the path variable, however using
[~,cmd] = system('echo %PATH%')
cmd =
C:\Program Files\MATLAB\R2016b\bin\win64;C:\Program Files\Microsoft MPI\Bin\;.....
clearly shows that Matlab adds itself to the path once it is opening the shell... So how can I force Matlab system command to not add itself or at least to use the other mpiexec?
Thanks!
  1 个评论
Andrea Michelotti
Andrea Michelotti 2021-9-27
Hi,
I had the same issue and I tried many cmd lines trying to execute mpiexec in the right way.
At the end, I just copied mpiexec.exe from Microsoft MPI folder into my MATLAB one and it worked fine.

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回答（1 个）

Marcel Beining
Marcel Beining 2017-10-27
Well, I found some workaround myself (searching for the mpi software on the path and temporarily putting it in front of Matlab, see below), but if there is a more elegant solution than this, please report it to me, thanks!
[~,pth] = system('echo %PATH%');
pth = strsplit(pth,';');
mpisoftw = cellfun(@(x) ~isempty(strfind(x,'mpi'))|~isempty(strfind(x,'MPI')),pth);
[~,cmd] = system(sprintf('set PATH=%s;%%PATH%%& where mpiexec',pth{find(mpisoftw,1,'first')}))
cmd =
C:\Program Files\Microsoft MPI\Bin\mpiexec.exe
C:\Program Files\MATLAB\R2016b\bin\win64\mpiexec.exe

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