From ab0f1afc484bdd5fc656c0757c86dae8cd55863c Mon Sep 17 00:00:00 2001
From: Matthieu Schaller <schaller@strw.leidenuniv.nl>
Date: Thu, 7 May 2020 21:39:15 +0200
Subject: [PATCH] Added some limited hints about OpenMPI from the GADI system

---
 README-mpi-hints.md | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/README-mpi-hints.md b/README-mpi-hints.md
index eef9967638..94c3948c3e 100644
--- a/README-mpi-hints.md
+++ b/README-mpi-hints.md
@@ -35,3 +35,16 @@ using the asynchronous progression settings:
 
 ## OpenMPI
 
+_Open MPI_ comes in many flavours with many combinations of underlying
+transport libraries and running on many different fabrics. A complete
+description of all combinations is beyond the scope of this guide.
+
+On Mellanox hardware, we have had success running version 4.0 with the
+UCX layer version 1.6 and using the following settings:
+
+```
+-mca coll_hcoll_enable 0
+UCX_TLS=ud_x,shm,self
+UCX_RC_MLX5_TM_ENABLE=n
+UCX_DC_MLX5_TM_ENABLE=n
+```
-- 
GitLab