From: Steve Lord <lord@sgi.com>
To: Andrew Morton <akpm@zip.com.au>
Cc: Ben Israel <ben@genesis-one.com>, linux-kernel@vger.kernel.org
Subject: Re: File System Performance
Date: 12 Nov 2001 15:45:02 -0600 [thread overview]
Message-ID: <1005601502.13301.12.camel@jen.americas.sgi.com> (raw)
In-Reply-To: <3BF04289.8FC8B7B7@zip.com.au>
In-Reply-To: <3BF03402.87D44589@zip.com.au>, <3BF02702.34C21E75@zip.com.au>, <00b201c16b81$9d7aaba0$5101a8c0@pbc.adelphia.net> <3BEFF9D1.3CC01AB3@zip.com.au> <00da01c16ba2$96aeda00$5101a8c0@pbc.adelphia.net> <3BF02702.34C21E75@zip.com.au> <1005595583.13307.5.camel@jen.americas.sgi.com> <3BF03402.87D44589@zip.com.au> <1005600431.13303.10.camel@jen.americas.sgi.com> <3BF04289.8FC8B7B7@zip.com.au>
On Mon, 2001-11-12 at 15:43, Andrew Morton wrote:
>
> It's tar. It cheats. It somehow detects that the
> output is /dev/null, and so it doesn't read the input files.
> I think.
>
Yep it cheats all right:
execve("/bin/tar", ["tar", "cf", "/dev/null", "linux"], [/* 30 vars */])
= 0
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
59.70 1.114097 740 1505 getdents64
37.22 0.694516 55 12650 lstat64
1.62 0.030264 39 775 3 open
0.56 0.010518 14 777 close
0.40 0.007395 10 770 fstat64
0.24 0.004553 6 749 fcntl64
0.11 0.001972 986 2 poll
0.02 0.000420 210 2 2 connect
0.02 0.000418 32 13 read
0.02 0.000345 20 17 old_mmap
0.02 0.000286 36 8 munmap
0.02 0.000281 18 16 mmap2
0.01 0.000189 47 4 socket
0.01 0.000161 16 10 brk
0.01 0.000101 51 2 sendto
0.00 0.000076 15 5 mprotect
0.00 0.000076 38 2 recvfrom
0.00 0.000075 25 3 uname
0.00 0.000059 30 2 readv
0.00 0.000057 29 2 bind
0.00 0.000056 28 2 setsockopt
0.00 0.000039 39 1 readlink
0.00 0.000025 13 2 getpid
0.00 0.000023 23 1 rt_sigaction
0.00 0.000021 21 1 time
0.00 0.000021 21 1 gettimeofday
0.00 0.000014 7 2 ioctl
------ ----------- ----------- --------- --------- ----------------
100.00 1.866058 17324 5 total
Not a lot of reads in there.... I should have known it could
not go that fast.
Steve
--
Steve Lord voice: +1-651-683-3511
Principal Engineer, Filesystem Software email: lord@sgi.com
next prev parent reply other threads:[~2001-11-12 21:50 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-12 13:54 Ben Israel
2001-11-12 16:33 ` Andrew Morton
2001-11-12 17:50 ` Ben Israel
2001-11-12 19:46 ` Andrew Morton
2001-11-12 19:59 ` Richard Gooch
2001-11-12 23:07 ` Mike Fedyk
2001-11-13 0:04 ` Richard Gooch
2001-11-13 0:08 ` Mike Fedyk
2001-11-13 0:26 ` Richard Gooch
2001-11-13 0:47 ` Mike Castle
2001-11-13 1:28 ` Mike Fedyk
2001-11-13 6:34 ` Richard Gooch
2001-11-13 20:56 ` Andreas Dilger
2001-11-13 7:45 ` Andreas Dilger
2001-11-12 20:06 ` Steve Lord
2001-11-12 20:41 ` Andrew Morton
2001-11-13 0:17 ` Andreas Dilger
2001-11-13 0:40 ` Peter J . Braam
2001-11-13 20:46 ` Andreas Dilger
2001-11-16 22:07 ` Peter J . Braam
2001-11-16 23:14 ` Mike Fedyk
2001-11-12 21:27 ` Steve Lord
2001-11-12 21:43 ` Andrew Morton
2001-11-12 21:48 ` Linus Torvalds
2001-11-12 22:11 ` Lionel Bouton
2001-11-12 19:41 ` Gérard Roudier
2001-11-12 22:14 ` Linus Torvalds
2001-11-12 22:30 ` Ragnar Kjørstad
2001-11-12 22:36 ` Andrew Morton
2001-11-12 23:04 ` Mike Castle
2001-11-13 9:56 ` Peter Wächtler
2001-11-13 9:41 ` Henning P. Schmiedehausen
2001-11-12 22:16 ` Andrew Morton
2001-11-12 22:32 ` Lionel Bouton
2001-11-12 22:45 ` Alan Cox
2001-11-12 22:39 ` Alan Cox
2001-11-12 22:39 ` Xavier Bestel
2001-11-12 22:46 ` Mike Castle
2001-11-12 22:26 ` Steve Lord
2001-11-12 21:45 ` Steve Lord [this message]
2001-11-12 21:53 ` Lionel Bouton
2001-11-12 16:40 ` Ben Israel
2001-11-12 17:29 ` Andrew Morton
2001-11-12 22:36 Grant Erickson
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