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--- technical:whitepaper:start [2018-12-10 11:00] – frey
+++ technical:whitepaper:start [2021-02-12 16:01] – frey
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 {{ :technical:whitepaper:1344435822_27-edit_text.png?128|}}Some of the content in this area will be in PDF format and may need to be downloaded before being read.
+===== Mellanox UCX and Open MPI on DARWIN =====
+During early-access testing of the DARWIN cluster several users reported issues with their MPI jobs' crashing unexpectedly in code locations that worked on previous clusters (like Caviness).  The [[technical:whitepaper:darwin_ucx_openmpi|full troubleshooting and mitigation]] of the issue should be instructive for DARWIN users who attempt to build and manage their own Open MPI libraries on DARWIN.
+===== /dev/shm exhaustion =====
+As time goes by, the ''/dev/shm'' filesystem on compute nodes can fill with orphaned files.  Without swap matching the amount of RAM in the node, these files will begin putting pressure on subsequent applications that run on the node.  In [[technical:whitepaper:automated_devshm_cleanup|Automated /dev/shm cleanup]], a method of removing orphaned files from ''/dev/shm'' is outlined.
 ===== R: runtime configurable BLAS/LAPACK =====
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   * [[hpcc open64 acml|open64 compiler with ACML and openmpi libraries]]