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New tool: codes_split_file. Point to the new confluence tools documentation page.
Example using 8 processes in parallel:
% time grib_set -s date=20171201,shortName=t 1million.grib1 reference.grib
219.394u 0.515s 3:40.00 99.9%   0+0k 0+338784io 0pf+0w

% time ./grib_set_parallel_split.sh 1million.grib1 final.grib date=20171201,shortName=t
376.212u 1.675s 0:51.33 736.1%  0+0k 0+1016416io 0pf+0w