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Hi, sorry that I have not been clearer, but my main complaint is that > NetCDF: Invalid argument > Location: file nccopy.c; line 637 isn't a useful feedback to a user trying to chunk some dimensions.I think it is caused by nccopy using 0 (NC_UNLIMITED) as default for unlimited dimension which doesn't work for chunking. 1 or anything else would be much, much better than 0.
In my world of operational meteorology, file-formats change very slowly - a default of 1 is very similar to what netcdf-3 has been doing with unlimited dimensions and it won't surprise users as a default.
Best regards, Heiko On 2014-10-23 16:22, Ed Hartnett wrote:
This gives very poor performance when the number of timesteps in the file is large. On Thu, Oct 23, 2014 at 5:25 AM, Heiko Klein <Heiko.Klein@xxxxxx <mailto:Heiko.Klein@xxxxxx>> wrote: Hi, when chunking files with unlimited dimension, the unlimited dimension must be given explicitly in nccopy, and will usually be set to one. In a file with time as unlimited dimension, and X and Y as dimensions, it is currently required to use $ nccopy -k 4 -c "time/1,X/100,Y/100" in.nc <http://in.nc> out.nc <http://out.nc> When running without time, it does not work: $ nccopy -k 4 -c "X/100,Y/100" in.nc <http://in.nc> out.nc <http://out.nc> NetCDF: Invalid argument Location: file nccopy.c; line 637 Only for unlimited dimensions, one needs to give the dimension explicitly, for all other dimensions a useful default (full dim-size) is used. I think a useful default for unlimited dimensions is 1. Heiko -- Dr. Heiko Klein Tel. + 47 22 96 32 58 <tel:%2B%2047%2022%2096%2032%2058> Development Section / IT Department Fax. + 47 22 69 63 55 <tel:%2B%2047%2022%2069%2063%2055> Norwegian Meteorological Institute http://www.met.no P.O. Box 43 Blindern 0313 Oslo NORWAY _________________________________________________ netcdfgroup mailing list netcdfgroup@xxxxxxxxxxxxxxxx <mailto:netcdfgroup@xxxxxxxxxxxxxxxx> For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/__mailing_lists/ <http://www.unidata.ucar.edu/mailing_lists/>
-- Dr. Heiko Klein Tel. + 47 22 96 32 58 Development Section / IT Department Fax. + 47 22 69 63 55 Norwegian Meteorological Institute http://www.met.no P.O. Box 43 Blindern 0313 Oslo NORWAY
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