From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh-users@zsh.org
Subject: Re: if the file is not found the files is not found is the file not found
Date: Sun, 04 Mar 2012 13:47:21 -0800 [thread overview]
Message-ID: <120304134721.ZM25119@torch.brasslantern.com> (raw)
In-Reply-To: <CAHYJk3RsBwFCFLwdeQYJPygmRsYGQ9CxjvAF+YtnkE4PwxZfQQ@mail.gmail.com>
On Mar 4, 9:13pm, Mikael Magnusson wrote:
}
} >> if () { (( $# )) } arglblargh*(N[1]); then echo yes; else echo no; fi
} >
} > (Also, the [1] in your formula is extraneous, but that's a nit.)
}
} I like to imagine that it causes less data to be copied around. :)
According to valgrind, for a pattern matching six files the ([1]) saves
3 mallocs and 3 frees but uses 346 *more* bytes of memory. "time" on
10 runs of each shows no difference at all.
The ([1]) does begin to win on memory as well when the number of matched
files grows, but even at 360+ files no difference in time is detectable,
probably because the vast bulk is taken up by doing the glob in the first
place.
(e:'[ -f "$REPLY" ]':) takes about 3 times as long and uses 5 times as
much memory, with or without ([1]) added. (e:'[[ -f "$REPLY" ]]') is
better, only double time and triple memory, and is on a par with adding
(.) as a qualifier.
So there you go. :-)
next prev parent reply other threads:[~2012-03-05 0:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-04 14:31 meino.cramer
2012-03-04 14:36 ` Moritz Bunkus
2012-03-04 14:37 ` Mikael Magnusson
2012-03-04 18:37 ` Bart Schaefer
2012-03-04 18:48 ` Mikael Magnusson
2012-03-04 19:44 ` Bart Schaefer
2012-03-04 20:13 ` Mikael Magnusson
2012-03-04 21:47 ` Bart Schaefer [this message]
2012-03-05 0:48 ` Mikael Magnusson
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