Reading large grib2 files

From: Andrea Hahmann <ahah_at_nyahnyahspammersnyahnyah>
Date: Fri, 14 Aug 2009 15:36:21 +0200

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 N. Hahmann
Wind Energy Division
Risų DTU
Technical University of Denmark ­ DTU
Risų 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

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Received on Fri Aug 14 2009 - 07:36:21 MDT

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