[Wrf-users] Benchmarking problems

[Bart Brashers]

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):

&domains
...snip...
 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:

 WRF NUMBER OF TILES FROM OMP_GET_MAX_THREADS =   6
 WRF NUMBER OF TILES =   6

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.

Bart



This message contains information that may be confidential, privileged or otherwise protected by law from disclosure. It is intended for the exclusive use of the Addressee(s). Unless you are the addressee or authorized agent of the addressee, you may not review, copy, distribute or disclose to anyone the message or any information contained within. If you have received this message in error, please contact the sender by electronic reply to email at environcorp.com and immediately delete all copies of the message.