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This allows us to get better performance by default on machines with OmniPath hardware. * gnu/packages/patches/openmpi-psm2-priority.patch: New file. * gnu/packages/mpi.scm (openmpi)[source]: Use it. * gnu/local.mk (dist_patch_DATA): Add it.
21 lines
981 B
Diff
21 lines
981 B
Diff
PSM2 is the only valid implementation for OmniPath (OPA). UCX also
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supports OmniPath, but it does so via Verbs, thus getting much lower
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performance (typically 3 GiB/s instead of 10 GiB/s).
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To work around that, give the mtl_psm2 component a higher priority
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than the pml_ucx component.
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See <https://www.mail-archive.com/users@lists.open-mpi.org/msg33581.html>.
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--- openmpi-4.0.2/ompi/mca/mtl/psm2/mtl_psm2_component.c 2019-11-15 17:06:15.142076840 +0100
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+++ openmpi-4.0.2/ompi/mca/mtl/psm2/mtl_psm2_component.c 2019-11-15 17:06:22.242009379 +0100
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@@ -126,7 +126,7 @@ ompi_mtl_psm2_component_register(void)
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setenv("PSM2_DEVICES", "self,shm", 0);
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}
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- param_priority = 40;
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+ param_priority = 55;
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(void) mca_base_component_var_register (&mca_mtl_psm2_component.super.mtl_version,
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"priority", "Priority of the PSM2 MTL component",
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MCA_BASE_VAR_TYPE_INT, NULL, 0, 0,
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