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gnu: openmpi: Raise the priority of the PSM2 component.

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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.
This commit is contained in:
Ludovic Courtès 2019-11-15 17:15:05 +01:00 committed by Ludovic Courtès
parent 348caf3d2c
commit faab7082ab
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3 changed files with 24 additions and 1 deletions
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1
gnu/local.mk
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@ -1192,6 +1192,7 @@ dist_patch_DATA = \
%D%/packages/patches/opencv-rgbd-aarch64-test-fix.patch \
%D%/packages/patches/openfoam-4.1-cleanup.patch \
%D%/packages/patches/openjdk-10-idlj-reproducibility.patch \
%D%/packages/patches/openmpi-psm2-priority.patch \
%D%/packages/patches/openocd-nrf52.patch \
%D%/packages/patches/opensmtpd-fix-crash.patch \
%D%/packages/patches/openssl-runpath.patch \

3
gnu/packages/mpi.scm
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@ -174,7 +174,8 @@ (define-public openmpi
(version-major+minor version)
"/downloads/openmpi-" version ".tar.bz2"))
(sha256
(base32 "0ms0zvyxyy3pnx9qwib6zaljyp2b3ixny64xvq3czv3jpr8zf2wh"))))
(base32 "0ms0zvyxyy3pnx9qwib6zaljyp2b3ixny64xvq3czv3jpr8zf2wh"))
(patches (search-patches "openmpi-psm2-priority.patch"))))
(build-system gnu-build-system)
(inputs
`(("hwloc" ,hwloc-2 "lib")

21
gnu/packages/patches/openmpi-psm2-priority.patch Normal file
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@ -0,0 +1,21 @@
PSM2 is the only valid implementation for OmniPath (OPA). UCX also
supports OmniPath, but it does so via Verbs, thus getting much lower
performance (typically 3 GiB/s instead of 10 GiB/s).
To work around that, give the mtl_psm2 component a higher priority
than the pml_ucx component.
See <https://www.mail-archive.com/users@lists.open-mpi.org/msg33581.html>.
--- openmpi-4.0.2/ompi/mca/mtl/psm2/mtl_psm2_component.c 2019-11-15 17:06:15.142076840 +0100
+++ openmpi-4.0.2/ompi/mca/mtl/psm2/mtl_psm2_component.c 2019-11-15 17:06:22.242009379 +0100
@@ -126,7 +126,7 @@ ompi_mtl_psm2_component_register(void)
setenv("PSM2_DEVICES", "self,shm", 0);
}
- param_priority = 40;
+ param_priority = 55;
(void) mca_base_component_var_register (&mca_mtl_psm2_component.super.mtl_version,
"priority", "Priority of the PSM2 MTL component",
MCA_BASE_VAR_TYPE_INT, NULL, 0, 0,