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v11: Update Intel MPI flags #632

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Testing by @wmputman and @pchakraborty on SLES15 at NCCS show that using:

setenv I_MPI_FABRICS shm:ofi
setenv I_MPI_OFI_PROVIDER psm3

is all that is needed. So this PR changes the flags on SLES15 to reflect this. For now it should keep the SLES12 flags as they were before.

This should be used only in concert with GEOS-ESM/GEOSgcm#804 which moves GEOSgcm to Intel MPI 2021.13. It might work with older Intel MPI...but I've only tested with that version.

NOTE: Once Cascade Lake moves to SLES15, this might need to be revisited as perhaps these are Milan-only flags.

@mathomp4 mathomp4 added the 0 diff The changes in this pull request have verified to be zero-diff with the target branch. label Jul 24, 2024
@mathomp4 mathomp4 self-assigned this Jul 24, 2024
@mathomp4 mathomp4 marked this pull request as ready for review July 30, 2024 15:50
@mathomp4 mathomp4 requested a review from a team as a code owner July 30, 2024 15:50
@mathomp4 mathomp4 added the Contingent - DNA Do Not Approve (DNA). These changes are contingent on other PRs label Jul 31, 2024
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This PR is being prevented from merging because you have added one of our blocking labels: Contingent - DNA, Needs Lead Approval, Contingent -- Do Not Approve. You'll need to remove it before this PR can be merged.

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