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Lassen: No MPI 4+ Support #5759
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ax3l
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Mar 12, 2025
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`mpi4py>=4.0` were released and support MPI 4 features. But Lassen does not support MPI 4 in the IBM Spectrum rolling releases. Thus, limit the upper versions of `mpi4py` for now. Also making the compilers for `h5py` a bit more robust, using the Lassen-specific wrapper name (hey, thanks for being special). https://hpc.llnl.gov/documentation/tutorials/using-lc-s-sierra-systems#Compilers
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TOSS4 never arrived.
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Hm, I see segfaults of the form
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and
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They go away if I remove the
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Causes segfaults
@bzdjordje this fixes it for me. Maybe all you need to do is update your |
Merging to show fully working example to the user in the live docs & mainline scripts. |
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mpi4py>=4.0
was released and supports (and requires) MPI 4 features. But Lassen does not support MPI 4 in the IBM Spectrum rolling releases.Thus, limit the upper versions of
mpi4py
for now.Making the compilers for
h5py
a bit more robust, using the Lassen-specific wrapper name. https://hpc.llnl.gov/documentation/tutorials/using-lc-s-sierra-systems#CompilersThe Lassen TOSS4 upgrade never was shipped, so we can simplify our paths and names again. Some confusion was left here in paths that prevented a smooth install
cc @bzdjordje
Fix #5728
To Do