[mpiwg-hybridpm] mpi_memory_alloc_kinds questions/clarifications

[Raffenetti, Ken]

I asked about the last scenario in Slack, but the discussion is unfortunately lost. My recollection was that this sentence on pg 509, ln 26-27:

  The substrings that indicate support for these memory allocation kinds must be identical to those supplied by the user.

means that you cannot _only_ return “rocm” when the request was for “rocm:device”. MPICH will return both “rocm,rocm:device” for such a request.

Ken

From: mpiwg-hybridpm <mpiwg-hybridpm-bounces at lists.mpi-forum.org> on behalf of Edgar Gabriel via mpiwg-hybridpm <mpiwg-hybridpm at lists.mpi-forum.org>
Date: Wednesday, January 29, 2025 at 11:55 AM
To: Hybrid working group mailing list <mpiwg-hybridpm at lists.mpi-forum.org>
Cc: Edgar Gabriel <edgar.gabriel1 at outlook.com>
Subject: [mpiwg-hybridpm] mpi_memory_alloc_kinds questions/clarifications

More relevant however is potentially something else. When user requests e.g. with



           mpiexec -mpi-memory-alloc-kinds system,mpi,rocm:device -np 32 …



the MPI library is allowed to return more memory types than requested by the user, e.g. it would be valid for mpi_memory_alloc_kinds info to contain



            mpi,system,rocm:device,rocm:host,rocm:managed



or



            mpi,system,rocm



which is equivalent in my understanding, since device,host,and managed are all the memory types supported by the rocm memkind, and supporting all three of them is equivalent to not providing any restrictors. Our examples in the side document could not handle that however, what we would need to do e.g. for the rocm testcase would be something like
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