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,
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<div class='path'>path: <a href='/guix/log/?id=ecb0469e10fc4cef3b3b6b5884de3caec635685c'>root</a>/<a href='/guix/log/gnu?id=ecb0469e10fc4cef3b3b6b5884de3caec635685c'>gnu</a>/<a href='/guix/log/gnu/packages?id=ecb0469e10fc4cef3b3b6b5884de3caec635685c'>packages</a>/<a href='/guix/log/gnu/packages/uucp.scm?id=ecb0469e10fc4cef3b3b6b5884de3caec635685c'>uucp.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/uucp.scm?id=ecb0469e10fc4cef3b3b6b5884de3caec635685c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-11-09 21:33:55 +0000'>2024-11-09</span></td><td><a href='/guix/commit/gnu/packages/uucp.scm?id=8ee3669af48d78c919b42b124eb05d7d2bf2a2d0'>gnu: go-github-com-dustin-go-humanize: Move to golang-xyz.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/golang.scm (go-github-com-dustin-go-humanize): Move from
here ...
* gnu/packages/golang-xyz.scm: ... to here.
* gnu/packages/uucp.scm: Add golang-xyz module.

Change-Id: Ic0913615d559ec255bf98abfab99383edf3c9a84
</span></span></td><td>Sharlatan Hellseher</td></tr>
<tr><td><span title='2024-07-25 21:26:19 +0100'>2024-07-25</span></td><td><a href='/guix/commit/gnu/packages/uucp.scm?id=734bf6bf02494e75808404c63b4c4f6384835f8a'>gnu: go-github-com-hjson-hjson-go: Rename variable.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/golang-web.scm (go-github-com-hjson-hjson-go): Rename
variable to go-github-com-hjson-hjson-go-v4 to reflect go.mod import path.
Apply new package style.
* gnu/packages/networking.scm (yggdrasil) [propagated-inputs]: Remove
go-github-com-hjson-hjson-go, add go-github-com-hjson-hjson-go-v4.
* gnu/packages/uucp.scm (nncp) [propagated-inputs]: Remove
go-github-com-hjson-hjson-go, add go-github-com-hjson-hjson-go-v4.

Change-Id: I9e99f208feaf535d9946e11dff09a81fc4a01a7a
</span></span></td><td>Sharlatan Hellseher</td></tr>
<tr><td><span title='2024-06-29 09:37:40 +0100'>2024-06-29</span></td><td><a href='/guix/commit/gnu/packages/uucp.scm?id=e7349f1f8155b714b757a716439827578e2f6cec'>gnu: nncp: Apply "-trimpath" flag.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/uucp.scm (nncp) [arguments]:
&lt;#:phases&gt;: Remove 'remove-go-references phase.
Set BUILDFLAGS=-trimpath to replace 'remove-go-references phase in
'configure phase.

Change-Id: I7cfe14174e38708d36329d8e33ed6bb1ce0ae220
</span></span></td><td>Sharlatan Hellseher</td></tr>