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and, with reference to my previous message, I forgot specifying that the script is composed of a sole dynamic analysis of a very large model to be processed in parallel (OpenSeesSP).

Thank you for your response.
Unfortunately, it has not solved the issue in my case.
Anyway, I repeated the installation procedure on another multi-core machine and it works properly.

Actually, I would have another question. I am running a .tcl script in the OpenSeesSP interpreter through the following command
mpiexec -np 10 OpenSeesSP myfile.tcl
and, although the script is well processed by the interpreter, it seems that the analysis is computed 10 times, as many as the number of processors assigned to the job. I am probably missing something.
I really thank you in advance for any suggestions you might provide me.

Hi,
I am dealing with the same problem.
MPICH2 is correctly installed (mpiexec -validate => SUCCESS) and I am able to run properly the test file "mpiexec -n 4 cpi" but, as described by Paysheen, the command "mpiexec -np 4 openseesSP(or MP) myfile.tcl" does not show anything and goes to a new command on the console.
I would be really grateful for any suggestions you might provide me.
Thank you in advance.