Date: Fri, 10 Feb 2012 16:24:58 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-questions@freebsd.org Subject: Re: 'rm' Can not delete files Message-ID: <4F3544DA.8010003@infracaninophile.co.uk> In-Reply-To: <CAB%2B9ogewck4LU9wPtE4hWtT03ZoRBhYz3p-43WHkMcLoiX3Ahg@mail.gmail.com> References: <1237723287.20120207235924@yandex.ru> <4F31A260.20109@infracaninophile.co.uk> <20120207231716.31aa8bc3@gumby.homeunix.com> <20120209032544.GA58560@ozzmosis.com> <CAE7N2kdmbm_5=c8oNknYQE5HOrvVjtfS4XTGYvxTjEQVbGr-7Q@mail.gmail.com> <4F353D1F.3020100@herveybayaustralia.com.au> <CAB%2B9ogewck4LU9wPtE4hWtT03ZoRBhYz3p-43WHkMcLoiX3Ahg@mail.gmail.com>
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On 10/02/2012 16:04, Matthew Story wrote:
> find . -type f -depth 1 -print0 | xargs -n99 -0 -s8192 -c5 rm --
>=20
> or some such, depending on your needs, I believe in most situations thi=
s
> particular invocation will also out-perform find ... -delete.
Why would you believe that? find ... -delete calls unlink(2) directly on
each file it finds as it searches the directory tree given that it
matches the other find predicates.
Whereas find ... -print0 | xargs ... rm ... involves a whole complicated
sequence of find doing the same searching and matching job, then
marshalling lists of filenames, piping them between processes, then
xargs exec(2)ing rm with chunks of that arglist; each rm invocation then
finally ... calling unlink(2) on each of the named files.
Actually, I doubt you'ld see much difference above the noise in the
speed of either of those two commands: they're both going to spend the
vast majority of the time waiting for disk IO, and that's common to any
way of doing this job.
Cheers,
Matthew
--=20
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
JID: matthew@infracaninophile.co.uk Kent, CT11 9PW
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