ofi/common: fix code that broke sessions #12882
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With sessions initialization model (section 11.3 of MPI 4 standard) MPI may be initialized and finalized any number of times. This patch refactors code that was assuming a one shot init/finalize sequence for initializing Open MPI and its MCA param space The underlying problem with the replaced code was that when an app calls MPI_Session_finalize and there are no more sessions active, the MCA param space is destroyed. So if one does not build Open MPI to use dynamically load components, and a component is using static variables in a way that assumes the MCA param space is always preserved if a static variable is set to some value, then things break if a subsequent MPI_Session_init is invoked. Related to open-mpi#12869 Signed-off-by: Howard Pritchard <[email protected]> (cherry picked from commit 2f4ba1b)
edgargabriel
approved these changes
Oct 25, 2024
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With sessions initialization model (section 11.3 of MPI 4 standard) MPI may be initialized and finalized any number of times.
This patch refactors code that was assuming a one shot init/finalize sequence for initializing Open MPI and its MCA param space
The underlying problem with the replaced code was that when an app calls MPI_Session_finalize and there are no more sessions active, the MCA param space is destroyed. So if one does not build Open MPI to use dynamically load components, and a component is using static variables in a way that assumes the MCA param space is always preserved if a static variable is set to some value, then things break if a subsequent MPI_Session_init is invoked.
Related to #12869
Signed-off-by: Howard Pritchard [email protected]
(cherry picked from commit 2f4ba1b)