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Subject: Re: File System Performance
To: akpm@zip.com.au (Andrew Morton)
Date: Mon, 12 Nov 2001 22:39:17 +0000 (GMT)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <3BF04A37.29E19B1A@zip.com.au> from "Andrew Morton" at Nov 12, 2001 02:16:23 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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>         Corrections to speed-up the sizeing pass in Amanda:
>         * tar.h: Declare dev_null_output.
>         * buffer.c (open_archive): Detect when archive is /dev/null.
>         (flush_write): Avoid writing to /dev/null.
>         * create.c (dump_file): Do not open file if archive is being
>         written to /dev/null, nor read file nor restore times.
>         Reported by Greg Maples and Tor Lillqvist.
> 
> One wonders why.

So when you archive the file set twice (once to compute its size) its
faster. Seems sane enough. 
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