Differences

This shows you the differences between two versions of the page.

--- hpc:bghep:benchmarks [2014/05/27 16:23]
edmay
+++ hpc:bghep:benchmarks [2014/05/27 16:45] (current)
edmay
@@ Line 66: / Line 66: @@
 produced the following figures:
 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: 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
 BG/Q Mira and a subset up the benchmarks were run in the new
-IO model. The results are shown in [[http://www.hep.anl.gov/may/ALCF/new.mira.4up.pdf][Mira figures]]
+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]]
- --- //[[[email protected]|Ed May]] 2014/02/04 10:42//
+ --- //[[[email protected]|Ed May]] 2014/02/04 //
+ --- //[[[email protected]|Ed May]] 2014/05/27 //
  --- //[[[email protected]|Sergei Chekanov]] 2014/02/04 10:42//

ATLAS Support Center