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From: Grant Coady <gcoady@gmail.com>
To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: Bernd Eckenfels <be-news06@lina.inka.de>, linux-kernel@vger.kernel.org
Subject: Re: Why is 2.4.32 four times faster than 2.6.14.6??
Date: Mon, 09 Jan 2006 06:20:41 +1100	[thread overview]
Message-ID: <aap2s1diakl9dg7noa8a4p4kr688lhc1b5@4ax.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0601081303140.30148@yvahk01.tjqt.qr>

On Sun, 8 Jan 2006 13:04:22 +0100 (MET), Jan Engelhardt <jengelh@linux01.gwdg.de> wrote:

>
>>grant@deltree:~$ time grep -v 192\.168\. /var/log/apache/access_log |cut -c-96
>>
>>real    0m1.671s
>>user    0m0.550s
>>sys     0m0.300s
>>grant@deltree:~$ time grep -v 192\.168\. /var/log/apache/access_log |cut -c-96 >/dev/null
>>
>>real    0m0.510s
>>user    0m0.420s
>>sys     0m0.080s
>
>Given that the first command is the first one accessing access_log at 
>all, then: the second time, access_log is already cached and 
>therefore can be accessed faster.

I did repeat measurements to check for variation due to caching, 
and that is not what is happening, we comparing going out over 
ssh terminal to dumping output locally.

Grant.

  reply	other threads:[~2006-01-08 19:20 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-01-08  6:16 Why is 2.4.32 four times faster than 2.6.14.6?? Grant Coady
2006-01-08  6:58 ` Markus Rechberger
2006-01-08  7:18   ` Bernd Eckenfels
2006-01-08  7:42     ` Grant Coady
2006-01-08  8:00       ` Bernd Eckenfels
2006-01-08  8:11         ` Con Kolivas
2006-01-08  9:12           ` Bernd Eckenfels
2006-01-08 12:04       ` Jan Engelhardt
2006-01-08 19:20         ` Grant Coady [this message]
2006-02-22 19:27           ` Enrico Weigelt
2006-02-22 23:17             ` Adrian Bunk
2006-01-08  7:28   ` Grant Coady
2006-01-08  9:57     ` Willy Tarreau
2006-01-08 10:23       ` Bernd Eckenfels
2006-01-08 10:54         ` Willy Tarreau
2006-01-08 11:09           ` Bernd Eckenfels
2006-01-08 11:16             ` Willy Tarreau
2006-01-08 11:18         ` Grant Coady
2006-01-09  2:37           ` Jesse Brandeburg
2006-01-09  2:46             ` Lee Revell
2006-01-09  2:59             ` Grant Coady
2006-01-09  6:56             ` Grant Coady
2006-01-08 11:05       ` Grant Coady
2006-01-08 18:21         ` Octavio Alvarez Piza
2006-01-08 19:27           ` Grant Coady

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