WRF and Parallel NetCDF

[John Michalakes]

Hi Han Lung,

Parallel NetCDF is in use by a number of users of the WRF system. I've 
used it regularly to improve I/O performance on the NCAR IBM systems, 
using GPFS, and on Lustre file systems at NREL and elsewhere.  You don't 
need to install NetCDF to use pNetCDF but people generally do.  To run 
WRF using pNetCDF, set the io_form_* variable in WRF's namelist.input 
file to 11 (instead of 2, which means regular NetCDF).  You can set 
these separately for input, history, boundary data, restart, and any of 
the auxiliary input and auxiliary history streams in WRF.

Please let me know if you need more information.  You can also contact 
wrfhelp at ucar.edu for assistance.

Regards,

John

On 8/31/2011 3:54 PM, Han Lung wrote:
>
> To whom it may concern,
>
> This is Han Lung, Director of HPC Group, Fujitsu America.  I am new to 
> WRF and parallel-netcdf, so if I have asked some stupid questions 
> please bear with me.
>
> From the README file for WRF, I realize WRF requires NetCDF.  In the 
> last section of the README file (Software section), I see  "* I/O: 
> NetCDF, parallel NetCDF (Argonne), HDF5,...", but I do not see how to 
> use parallel NetCDF with WRF.
>
> My questions are:
>
> 1. Do you know anyone who used WRF + Parallel NetCDF?
>
> 2. Do I have to install NetCDF for WRF even if I want to use Parallel 
> NetCDF?
>
> 3. How do I run WRF with Parallel NetCDF?
>
> Your help is deeply appreciated.
>
> Thanks and best regards,
>
> Han Lung
>
> Director, HPC Group
>
> Fujitsu America, Inc.
>
> hlung at us.fujitsu.com <mailto:hlung at us.fujitsu.com>
>

-- 
John Michalakes
National Renewable Energy Laboratory
1617 Cole Blvd.
Golden, Colorado 80401
Phone: 303-275-4297
Fax: 303-275-4091
http://www.nrel.gov/csc/staff_michalakes.html

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