[Wrf-users] WRF on BlueGene/L

Andrew Porter andrew.porter at stfc.ac.uk
Fri Oct 2 07:37:10 MDT 2009

> We have been running WRF on our Intel based linux cluster and we wanted to
> try to run it on a BlueGene/L that we have access to. So, I just wanted to
> enquire as to whether anyone on this mailing list has had experience running WRF
> on this platform, and whether any open issues are present. The BlueGene/L that
> we have has 8096 processors.
I have run on a BG/P up to ~23K processors. Up to 8096 I was able to do 
this without problems (albeit playing with the node occupation because 
of the low memory per node). On large core counts I found the default 
netcdf IO layer of WRF becomes a huge bottleneck. Although I haven't 
tried it on the BG, I've found slides on t'internet that indicate that 
this is why the parallel netcdf layer was put into WRF.

God bless,


Dr. Andrew Porter
Computational Scientist
Advanced Research Computing Group
Computational Science and Engineering Dept.
STFC Daresbury Laboratory
Keckwick Lane
Tel. : +44 (0)1925 603607
email: andrew.porter at stfc.ac.uk

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