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--- cluster:192 [2020/02/26 19:47]
hmeij07 [Usage]
+++ cluster:192 [2020/02/26 20:05]
hmeij07 [EXX96]
@@ Line 4: / Line 4: @@
 ===== EXX96 =====
-A page for me on how these 12 nodes were build up after they arrived. To make them "ala n37" which as the test node in redoing our K20 nodes, see [[cluster:172|K20 Redo]]
+A page for me on how these 12 nodes were build up after they arrived. To make them "ala n37" which was the test node in redoing our K20 nodes, see [[cluster:172|K20 Redo]]
 Page best followed bottom to top.
@@ Line 25: / Line 25: @@
              gputest gpu4
  Total             0    3
- Reserved        0.0  0.1
+ Reserved        0.0  1.0
 # old way of doing that
@@ Line 34: / Line 34: @@
 </code>
+Peer to peer communication is possible (via PCIe rather than NVlink) with this hardware.  This will get rather messy in setting up.  Some quick off the cuff performance data reveals some impact. Generally in our environment the gains are not worth the effort.  Using Amber and ''pmemd.cuda.MPI''
+<code>
+                                                                              cpu:gpu
+mdout.325288:|  Master Total CPU time:          982.60 seconds     0.27 hours   1:1
+mdout.325289:|  Master Total CPU time:          611.08 seconds     0.17 hours   4:2
+mdout.326208:|  Master Total CPU time:          537.97 seconds     0.15 hours  36:4
+</code>
 ==== Miscellaneous ====

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