From: Andrew Morton <akpm@digeo.com>
To: linux-kernel@vger.kernel.org
Subject: iosched: time to copy many small files
Date: Thu, 20 Feb 2003 21:25:54 -0800 [thread overview]
Message-ID: <20030220212554.3e99ec3e.akpm@digeo.com> (raw)
In-Reply-To: <20030220212304.4712fee9.akpm@digeo.com>
This test simply measures how long it takes to copy a large number of files
within the same filesystem. It creates a lot of small, competing read and
write I/O's. Changes which were made to the VFS dirty memory handling early
in the 2.5 cycle tends to make 2.5 a bit slower at this.
Three copies of the 2.4.19 kernel tree were placed on an ext2 filesystem.
Measure the time it takes to copy them all to the same filesystem, and to
then sync the system. This is just
cp -a ./dir-with-three-kernel-trees/ ./new-dir
sync
The anticipatory scheduler doesn't help here. It could, but we haven't got
there yet, and it may need VFS help.
2.4.21-pre4: 70 seconds
2.5.61+hacks: 72 seconds
2.5.61+CFQ: 69 seconds
2.5.61+AS: 66 seconds
next prev parent reply other threads:[~2003-02-21 5:14 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-21 5:23 IO scheduler benchmarking Andrew Morton
2003-02-21 5:23 ` iosched: parallel streaming reads Andrew Morton
2003-02-21 5:24 ` iosched: effect of streaming write on interactivity Andrew Morton
2003-02-21 5:25 ` iosched: effect of streaming read " Andrew Morton
2003-02-21 5:25 ` Andrew Morton [this message]
2003-02-21 5:26 ` iosched: concurrent reads of many small files Andrew Morton
2003-02-21 5:27 ` iosched: impact of streaming write on streaming read Andrew Morton
2003-02-21 5:27 ` iosched: impact of streaming write on read-many-files Andrew Morton
2003-02-21 5:27 ` iosched: impact of streaming read " Andrew Morton
2003-02-21 10:40 ` Andrea Arcangeli
2003-02-21 10:55 ` Nick Piggin
2003-02-21 11:23 ` Andrea Arcangeli
2003-02-21 21:11 ` Andrew Morton
2003-02-23 15:16 ` Andrea Arcangeli
2003-02-25 12:02 ` Pavel Machek
2003-02-21 5:28 ` iosched: effect of streaming read on streaming write Andrew Morton
2003-02-21 6:51 ` IO scheduler benchmarking David Lang
2003-02-21 8:16 ` Andrew Morton
2003-02-21 10:31 ` Andrea Arcangeli
2003-02-21 10:51 ` William Lee Irwin III
2003-02-21 11:08 ` Andrea Arcangeli
2003-02-21 11:17 ` Nick Piggin
2003-02-21 11:41 ` Andrea Arcangeli
2003-02-21 21:25 ` Andrew Morton
2003-02-23 15:09 ` Andrea Arcangeli
2003-02-21 11:34 ` William Lee Irwin III
2003-02-21 12:38 ` Andrea Arcangeli
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