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| author | Ludovic Courtès <ludo@gnu.org> | 2019-11-29 13:51:50 +0100 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2019-11-29 15:54:19 +0100 |
| commit | 68ac34e1209c8ba631aea119a2a547f267a88576 (patch) | |
| tree | 6fe4019a24002429632502eea72e9ef175cdc7d7 /gnu/packages/patches/openmpi-mtl-priorities.patch | |
| parent | f02fc042a4eccdf51489bdd18db0f37d5628b92d (diff) | |
| download | patches-68ac34e1209c8ba631aea119a2a547f267a88576.tar patches-68ac34e1209c8ba631aea119a2a547f267a88576.tar.gz | |
gnu: openmpi: Increase priority of the PSM component.
* gnu/packages/patches/openmpi-psm2-priority.patch: Rename to...
* gnu/packages/patches/openmpi-mtl-priorities.patch: ... this. Add hunk
to change the priority of PSM.
* gnu/packages/mpi.scm (openmpi)[source]: Adjust accordingly.
* gnu/local.mk (dist_patch_DATA): Likewise.
Diffstat (limited to 'gnu/packages/patches/openmpi-mtl-priorities.patch')
| -rw-r--r-- | gnu/packages/patches/openmpi-mtl-priorities.patch | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/gnu/packages/patches/openmpi-mtl-priorities.patch b/gnu/packages/patches/openmpi-mtl-priorities.patch new file mode 100644 index 0000000000..fd76594ddd --- /dev/null +++ b/gnu/packages/patches/openmpi-mtl-priorities.patch @@ -0,0 +1,35 @@ +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, + +Likewise for PSM: we want InfiniPath to be taken care of by PSM, not by UCX, +since UCX achieves worse performance. + +--- openmpi-4.0.2/ompi/mca/mtl/psm/mtl_psm_component.c ++++ openmpi-4.0.2/ompi/mca/mtl/psm/mtl_psm_component.c +@@ -92,7 +92,7 @@ ompi_mtl_psm_component_register(void) + + + /* set priority high enough to beat ob1's default */ +- param_priority = 30; ++ param_priority = 54; + (void) mca_base_component_var_register (&mca_mtl_psm_component.super.mtl_version, + "priority", "Priority of the PSM MTL component", + MCA_BASE_VAR_TYPE_INT, NULL, 0, 0, |