[Wrf-users] Nesting problem

[Bridgham, Christopher J TSgt USAF PACAF 36 OSS/OSW]

Dr. Puranik,

	I have found that the WRF needs at least 2000 grid points to
complete a run. I have run into the same problems trying to run small
grids but increasing the grid size to about 2000 points does solve the
problem. I don't know if there is an option you can set on compile to
actually try and improve this.

Respectfully,
Chris Bridgham
Weather Forecaster
United States Air Force

-----Original Message-----
From: wrf-users-bounces at ucar.edu [mailto:wrf-users-bounces at ucar.edu] On
Behalf Of Wg. Cdr. Dileep Puranik (Faculty at DOSS)
Sent: Wednesday, December 24, 2008 6:54 AM
To: wrf-users at ucar.edu
Subject: [Wrf-users] Nesting problem

Hello,

I have WRF V3.0 installed on an Intel quad-core machine with 4 GB of
RAM,
Fedora 9 Linux.

WRF V3.0 is compiled with 'dmpar' option since OpenMPI-2 is used for 
parallelizing. This troubles me since all four CPU cores are addressing
the same memory. Should we not use 'smpar'? Nesting option is 'basic'.

The model is run for a modestly sized domain, 15 x 15 degrees. When the
model is run at dx = 27 km, 15 km, 9 km it runs smoothly. When it is run
over a 360 km x 360 km domain at dx = 5 km or even 3 km, it runs without
problem. In the &domain part of the WRF namelist file, feedback = 1 so
that 2-way nesting should be OK. However with even one tiny nest of 5x5
grid points, computation aborts with the (memory) Segmentation error.

I request help to solve the problem.

Dileep Puranik

Dr D M Puranik
Department of Atmospheric and Space Science
University of Pune, Pune 411007, India

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