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WRF Timing Comparison: CX1 vs Discover

VERSION 4  Click to view document history
Created on: Apr 24, 2009 9:31 AM by Rahman Syed - Last Modified:  Feb 19, 2010 12:00 PM by Rahman Syed

This document is intended to present timing comparisons between 30-day runs of the WRF real test case on Discover and a Cray CX1 "desktop supercomputer".  Runs were limited to at most 16 cpus, as the CX1 currently configured only has two available compute nodes.

 

WRF was run on the southeast quadrant of the US at 30km resolution, from 3/1/09 until 3/31/09 with GFS data provided by National Climatic Data Center (NCDC).  Please see the attached WRF namelist for additional parameters that were used.

 

System specifications

One CX1 compute node

2 x Xeon X5472 @ 3ghz (8 cores total)

32gb RAM

mvapich2 v1.2p1 MPI Library

Intel v10.1 Fortran/C compiler

 

One Discover "Harpertown node"

2 x Xeon X5482 @ 3.2ghz (8 cores total)

16gb RAM

Intel v.3.2.011 MPI Library

Intel v10.1 Fortran/C compiler

 

Results

 

CX1 walltime (min)

Discover walltime (min)

1 cpu

132.08

152.46

2 cpus

64.90

75.91

4 cpus

45.25

42.77

8 cpus

25.78

24.28

16 cpus

15.13

19.23

 

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