From: Miles Bader <miles@gnu.org>
To: "Lennart Borgman \(gmail\)" <lennart.borgman@gmail.com>
Cc: Andreas Schwab <schwab@suse.de>, Emacs Devel <emacs-devel@gnu.org>
Subject: Re: Why does not rgrep use "grep -r"?
Date: Sat, 03 Nov 2007 12:37:47 +0900 [thread overview]
Message-ID: <877il06ltg.fsf@catnip.gol.com> (raw)
In-Reply-To: <472BD29F.5090205@gmail.com> (Lennart Borgman's message of "Sat\, 03 Nov 2007 02\:45\:03 +0100")
"Lennart Borgman (gmail)" <lennart.borgman@gmail.com> writes:
>> Neither method should use many processes unless the command-line
>> arg limit is very short (though on windows, maybe that's the case...).
>
> 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.
-Miles
--
It wasn't the Exxon Valdez captain's driving that caused the Alaskan oil spill.
It was yours. [Greenpeace advertisement, New York Times, 25 February 1990]
next prev parent reply other threads:[~2007-11-03 3:37 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 [this message]
2007-11-03 8:40 ` Eli Zaretskii
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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