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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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To learn about what's going on, see About the Archive Site.
Hi Robb, thanks for the information. I'll take a look at regenerating the gbx files.For what its worth--the *biggest* percentage slowdown is not with grib or grib2 files, but with netCDF files, surprisingly enough. My c routine (using an earlier version of netCDF) reads the files almost instantly--the java-netcdf4 arrangement reads the file much more slowly.
-Bill On 3/31/2009 12:56 PM, Robb Kambic wrote:
On Fri, 27 Mar 2009, Bill Moninger wrote:Hello netcdf-java folks,Thanks to good help from the netcdf-java staff, I'm now able to read and generate soundings from RUC files in netCDF, grib, and grib2 format. Its really nice to be able to use the same code for all three formats.Unfortunately, I find that, at least as I've implemented it, netcdf-java is 20% to 50% slower than my previous methods (using C).Bill,If you use the the grib index file, those are the files with the gbx suffix that are usually in the same dir as the grib file. You should delete them all and then regenerate them. The new index file read in much quicker. Currently, i working on grib performance issuesRobb...Moreover, it appears that java 1.6 is slower than 1.5 (though I haven't recompiled the underlying UCAR code in 1.6--only my code).If folks have any thoughts about how to speed things up, I will be much obliged to hear them.-Bill -- William R. Moninger http://www-frd.fsl.noaa.gov/~moninger/ NOAA / Earth Systems Research Laboratory / Global Systems Division 325 Broadway, R/GSD1 voice: 303-497-6435 Boulder, CO 80305 fax: 303-497-3329 _______________________________________________ netcdf-java mailing list netcdf-java@xxxxxxxxxxxxxxxxFor list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/===============================================================================Robb Kambic Unidata Program Center Software Engineer III Univ. Corp for Atmospheric Research rkambic@xxxxxxxxxxxxxxxx WWW: http://www.unidata.ucar.edu/===============================================================================
-- William R. Moninger http://www-frd.fsl.noaa.gov/~moninger/ NOAA / Earth Systems Research Laboratory / Global Systems Division 325 Broadway, R/GSD1 voice: 303-497-6435 Boulder, CO 80305 fax: 303-497-3329
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