What is the differences between “-genvall” and “-envall” ?

[jj_l_]

In the man doc of mpirun, it says that:

-genvall

              Use this option to enable propagation of all environment variables to all MPI processes.

 -envall

              Use this option to propagate all environment variables in the current argument set.

May I have a more plain-spoken explanation in their meaning and differences?

Thank you.

[jj_l_]

Optimization Notice is COMPLETELY USELESS.

it is NOT related to my questions at all.

[McCalpinJohn]

This might be easier to test than to try to understand from the documentation....

You can run "env" in the parent environment, then use mpirun to launch a script using each of the two options above.  The script can run "env" with the output redirected to a unique file name (e.g., a file name generated by "mktemp") so the output from multiple ranks does not get mixed together).

[jj_l_]

McCalpin, John wrote:

This might be easier to test than to try to understand from the documentation....

You can run "env" in the parent environment, then use mpirun to launch a script using each of the two options above.  The script can run "env" with the output redirected to a unique file name (e.g., a file name generated by "mktemp") so the output from multiple ranks does not get mixed together).

Thanks for your suggestion. It is a way to test it. If any intel tech support guys see this post, I still wish to have their official response.