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--- cluster:91 [2010/12/28 18:45]
hmeij
+++ cluster:91 [2010/12/28 18:50]
hmeij
@@ Line 139: / Line 139: @@
   * ETHERNET
-  * N calculation: 20 nodes, 4/8/16 gb mix for a total of 192 gb which yields 24 gb double precision (8 byte) elements … 24 gb is 40*1024*1024*1024 = 25,769,803,776 … take the square root of that and round 160529 … 80% of that is 128423
+  * N calculation: 20 nodes, 4/8/16 gb mix for a total of 192 gb which yields 24 gb double precision (8 byte) elements … 24 gb is 24*1024*1024*1024 = 25,769,803,776 … take the square root of that and round 160529 … 80% of that is 128,423
+  * NB: start with 64, then 128, try 192 ...
+  * PxQ: perfect square of 10x16=160, the number of cores we have
+  *
+  * INFINIBAND
+  * N calculation: 16 nodes, 8 gb per node for a total of 128 gb which yields 16 gb double precision (8 byte) elements … 16 gb is 16*1024*1024*1024 = 17,179,869,184 … take the square root of that and round 131,072 … 80% of that is 104,850
   * NB: start with 64, then 128, try 192 ...
   * PxQ: perfect square of 10x16=160, the number of cores we have

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