What is the differences between "-genvall" and "-envall"?

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When I need to pass my environment variables in my mpi job, what is the differences between "-genvall" and "-envall" options? I really cannot understand the description in man file.

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Take a look at https://docs.par-tec.com/html/psmpi-userguide/rn01re01.html

you will see

-genvall Export all environment variables to all processes. Same as --envall.

So there is no difference.