[Beowulf] Scaling issues on Xeon E5-2680
tegner at renget.se
Sun Feb 28 07:27:33 PST 2016
have issues with performance on E5-2680. Each of the nodes have 2 of
these 12 core CPUs on SuperMicro SuperServer 1028R-WMR (i.e., 24 cores
on each node).
For one of our applications (CFD/OpenFOAM) we have noticed that the
calculation runs faster using 12 cores on 4 nodes compared to when using
24 cores on 4 nodes.
In our environment we also have older AMD hardware (nodes with 4 CPUs
with 12 cores each), and here we don't see these strange scaling issues.
System is CentOS-7, and communication is over FDR Infiniband. BIOS is
recently updated, and hyperthreading is disabled.
Feel a bit lost here, and any hints on how to proceed with this are
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