From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Wed, 26 Jan 2005 15:18:48 -0700
From: andrey mirtchovski <mirtchov@cpsc.ucalgary.ca>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] fossil speed
In-Reply-To: <bcad6afcd37a3dc9f5ec58a336592223@plan9.ucalgary.ca>
Message-ID: <Pine.LNX.4.60.0501261514390.2276@fbsd.cpsc.ucalgary.ca>
References: <bcad6afcd37a3dc9f5ec58a336592223@plan9.ucalgary.ca>
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i managed to find a way of slowing down fossil even more (while discussing
this and how to include anything past the pipe in the timing on irc) by
working with many small files in a single directory:

plan9% ls b24 | wc -l; du b24
    3601
11827	b24
plan9% time tar cf b24.tar b24
0.05u 0.75s 7.31r 	 tar cf b24.tar b24
plan9% time tar xf b24.tar
0.09u 0.94s 4.99r 	 tar xf b24.tar
plan9%

$ time tar cf b24.tar b24

real    0m0.251s
user    0m0.060s
sys     0m0.175s
$ time tar xf b24.tar

real    0m1.291s
user    0m0.062s
sys     0m1.207s
$


repeated timings get the factor of difference up to 7, but still way below
the one you're observing..