I know that --disable-auto-cleanup is required to enable the fault-tolerant MPI features, but are there downsides to passing this? Performance implications?
I ask, because over at
https://github.com/sourceryinstitute/OpenCoarrays we've implemented much of the Fortran 2015 failed images feature on top of MPICH and other MPI implementations. But to use this, --disable-auto-cleanup must be passed to mpiexec. We provide wrapper scripts to try to abstract the back end (GASNet, MPI, OpenSHMEM etc.) in the form of a Fortran compiler wrapper, and an executable launcher. So I'm wondering, since failed images are part of the standard (2015) would it be dumb if we always pass --disable-auto-cleanup to mpiexec and only turn off support when explicitly asked for by the user, or is it safer/more performant to default to requiring the user to pass an additional flag to our wrapper script that results in --disable-auto-cleanup getting passed to mpiexec?