[Wrf-users] Radiative transfer performance in DM+SM run

Matt Foster Matthew.Foster at noaa.gov
Fri Jan 7 06:00:01 MST 2011

During some recent testing of a newly-configured domain (474x474, 3km) I 
noticed a rather significant difference in the performance of the 
radiative transfer (RRTM/Dudhia) when running a DM+SM build.  The 
radiative transfer timesteps are sometimes as much as 60% longer in 
DM+SM vs DM.  I've found this to be true with either OpenMPI or 
MVAPICH2, although it seems to be more pronounced with MVAPICH2.

Does anyone know why I'm seeing this behavior?


Do not go where the path may lead; go instead where there is no path and leave a trail.
-- Ralph Waldo Emerson

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