From: Eli Zaretskii <eliz@gnu.org>
To: Miles Bader <miles@gnu.org>
Cc: schwab@suse.de, lennart.borgman@gmail.com, emacs-devel@gnu.org
Subject: Re: Why does not rgrep use "grep -r"?
Date: Sat, 03 Nov 2007 10:40:02 +0200 [thread overview]
Message-ID: <u1wb7sowt.fsf@gnu.org> (raw)
In-Reply-To: <877il06ltg.fsf@catnip.gol.com> (message from Miles Bader on Sat, 03 Nov 2007 12:37:47 +0900)
> From: Miles Bader <miles@gnu.org>
> Date: Sat, 03 Nov 2007 12:37:47 +0900
> Cc: Andreas Schwab <schwab@suse.de>, Emacs Devel <emacs-devel@gnu.org>
>
> > I believed that grep had to be started many times. Is not that the case?
>
> xargs invokes grep in "batches," with as many filenames as will fit on
> the command line; for e.g. linux, that's many thousands at once, so
> process invocation overhead will tend to be in the noise compared to
> file I/O overhead.
Yes, but I believe "grep -r" will be still faster, even on GNU/Linux,
since all it does to recurse is `readdir' and `fnmatch'; the need for
writing file names to the pipe and reading them on the xargs side is
avoided.
next prev parent reply other threads:[~2007-11-03 8:40 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-02 21:42 Why does not rgrep use "grep -r"? Lennart Borgman (gmail)
2007-11-02 22:44 ` Miles Bader
2007-11-02 23:29 ` Andreas Schwab
2007-11-02 23:56 ` Lennart Borgman (gmail)
2007-11-03 1:31 ` Miles Bader
2007-11-03 1:45 ` Lennart Borgman (gmail)
2007-11-03 3:37 ` Miles Bader
2007-11-03 8:40 ` Eli Zaretskii [this message]
2007-11-03 9:43 ` David Kastrup
2007-11-03 11:01 ` Eli Zaretskii
2007-11-03 11:54 ` Lennart Borgman (gmail)
2007-11-04 18:59 ` David Kastrup
2007-11-05 5:24 ` Eli Zaretskii
2007-11-03 4:01 ` Ken Raeburn
2007-11-03 8:41 ` Eli Zaretskii
2007-11-03 8:37 ` Eli Zaretskii
2007-11-03 14:01 ` Stefan Monnier
2007-11-04 0:57 ` Kim F. Storm
2007-11-04 1:03 ` Lennart Borgman (gmail)
2007-11-04 1:15 ` Miles Bader
2007-11-04 10:32 ` Jason Rumney
2007-11-04 11:32 ` Lennart Borgman (gmail)
2007-11-04 11:48 ` Jason Rumney
2007-11-04 12:01 ` Lennart Borgman (gmail)
2007-11-05 5:22 ` Eli Zaretskii
2007-12-12 1:56 ` Lennart Borgman (gmail)
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