bug#60506: feature: parallel grep --recursive

[Paul Jackson]

There's no need for special logic in grep to run parallel grep's.

The "parallel" command can handle that for you.

For example, on the 12 core, 24 thread Ryzen CPU that I am using:

find $HOME -xdev -type f -ctime -333  |  wc -l     ## counts 136126 files.

find $HOME -xdev -type f -ctime -333 |
    parallel -m grep -l foobar | wc -l                        ## takes about 13 
seconds

find $HOME -xdev -type f -ctime -333 |
    xargs -d '\n' grep -l foobar | wc -l                      ## takes about 52 
seconds

The above parallel invocation ran 24 grep commands in parallel, and took
about 1/4 the time, otherwise performing rather like xargs, which ran one grep
command at a time.

(Granted, reading either the 'parallel' or 'xargs' man pages is not easy 
<grin>.)

-- 
                Paul Jackson
                pj@usa.net