Re: [netcdfgroup] Per variable chunking with nccopy

• To: netCDF Mail List <netcdfgroup@xxxxxxxxxxxxxxxx>
• Subject: Re: [netcdfgroup] Per variable chunking with nccopy
• From: Charlie Zender <zender@xxxxxxx>
• Date: Mon, 12 Jan 2015 20:19:42 -0800

Hi Aidan,

NCO version 4.4.7 (and later) implement the Rew chunking algorithm:

ncks -4 --cnk_plc=all --cnk_map=rew in.nc out.nc

http://nco.sf.net/nco.html#cnk
The C-code is in nco_cnk.c.

NCO only utilizes this algorithm for 3D variables.
4D variables in the same file will not be chunked by this algorithm,
though NCO will preserve their chunking from a previous algorithm.

We're open to suggestions on how to make this more usuable.
One idea would be to make, in NCO-speak, a chunk policy that
uses 'rew' chunk map for 3D vars, and something else for other ranks.

Followups on NCO-related implementation to NCO list please:
http://sf.net/p/nco/discussion/9829

Best,
cz
--
Charlie Zender, Earth System Sci. & Computer Sci.
University of California, Irvine 949-891-2429 )'(

• Follow-Ups:
  • Re: [netcdfgroup] Per variable chunking with nccopy
    • From: Chris Barker