Re: Reading large grib2 files

Hi Andrea,

You know this is coming...can you email me offline and provide
me with the location of your script and data on gale?

The code shouldn't hang, so this leads me to believe that you may be
trying to read in a variable that is larger than 4 Gb in size.

--Mary

On Fri, 14 Aug 2009, Andrea Hahmann wrote:

> Dear NCLelers,
>
> I have been running into troubles when reading large (> 2GB) grid2 files
> with NCL. The data comes from the 0.5 x 0.5 degree GFS model output from
> the NCAR MSS (ds335.0/GFS0p5). The NCL reads a single file, extracts the
> analysis (single time) 0.995 sigma level U and V winds, computes the wind
> speed, and writes a single NetCDF file containing the resulting output.
> Most times, the script takes 2-3 minutes to execute. Other times it just
> hangs without returning any errors. Any ideas of what I can do to improve
> the performance? All computations are done on the CISL data processing
> servers gale, gust, or breeze.
>
> Thanks in advance,
> Andrea
> --
>
> Andrea N. Hahmann
>
> Wind Energy Division
> Risø DTU
>
> Technical University of Denmark ­ DTU
> Risø National Laboratory for Sustainable Energy
> Frederikborgvej 399, P.O. Box 49
> Building 125
> DK-4000 Roskilde, Denmark
>
> Direct +45 4677 5471
> Fax +45 4677 5083
> ahah_at_risoe.dk
> www.risoe.dtu.dk
>
>
>

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Received on Fri Aug 14 2009 - 14:05:39 MDT