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--- hpc:bghep:benchmarks [2014/05/27 16:33]
edmay
+++ hpc:bghep:benchmarks [2014/05/27 16:45] (current)
edmay
@@ Line 67: / Line 67: @@
 http://www.hep.anl.gov/may/ALCF/new.vesta.4up.pdf Vesta Plots
 Focusing on the 'Efficiency' plots there appears to be some (small)
-improvements both at low core numbers and a high core numbers
+improvements both at low core numbers and a high core numbers: 80% rising to 90% and 20% rising to 40% respectively.
+The large step between 512 to 1024 is still present!
 As part of the bootcamp for MIRA the code was moved to the
@@ Line 74: / Line 75: @@
 IO model. The results are shown in
 http://www.hep.anl.gov/may/ALCF/new.mira.4up.pdf Mira figures
+Again focusing on the Efficiency plot the results are very
+similar. This suggest when using this naive IO model of each
+mpi rank writing its own output ProMC file should be limited to
+jobs of 512 cores or less for good utilization of the machine
+and IO resouces. This is OK for Vesta where the minimum charging
+is 32 nodes (ie 512 cores). While on Mira the minimum is 512
+nodes (ie 8192 cores) there is not a good match!
 [[hpc:bghep:| << back]]

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