36 lines
1.6 KiB
Diff
36 lines
1.6 KiB
Diff
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,
|