On Mon, Jan 12, 2015 at 8:19 PM, Charlie Zender <zender@xxxxxxx> wrote:
> 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.
>
indeed -- a reasonable default chunking for any dimension variable would be
good (even though it is, indeed, impossible to define the "best" one
without knowing the use-cases)
-Chris
--
Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chris.Barker@xxxxxxxx
