[Wrf-users] Benchmarking problems

Bart Brashers bbrashers at Environcorp.com
Mon Mar 14 13:08:49 MDT 2011

I'm trying to benchmark WRF on two comparable systems, Intel X5660 and
AMD 6174, before I buy.  I'm also trying to do a benchmark for those of
us who have many 5-day WRF runs to complete -- many runs with relatively
low core counts, rather than a single run with large core counts (the
focus of most benchmarks).

I downloaded the WRF 3.0 Benchmark parts from
http://www.mmm.ucar.edu/wrf/WG2/bench/.  I compiled using option 2
(smpar for PGI/gcc) with no problems.  In the namelist.input I specified
(for one particular run):

 numtiles                            = 1,
 nproc_x                             = 3,
 nproc_y                             = 2,
 num_metgrid_levels                  = 40,

I set OMP_NUM_THREADS to 6 in my run script that calls wrf.exe.

And yet, when I look in the resulting wrf.out file I see:


Hey! I told you to use 1 tile and split it 3 by 2!

Is this a problem with WRF v3.0?  Looking at some WRF 3.2.1 runs where I
have numtiles = 1 and specified 4 by 1, I got more verbose output like "
WRF TILE   1 IS      1 IE    165 JS      1 JE     33".

Scaling is poor after only 4 cores, so I suspect something is going
wrong.  Any suggestions you have would be greatly appreciated.


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