linux-ext4 - Re: compilebench numbers for ext4

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Message-ID: <20071022194854.0c98d583@think.oraclecorp.com>
Date:	Mon, 22 Oct 2007 19:48:54 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: compilebench numbers for ext4

On Mon, 22 Oct 2007 19:31:04 -0400
Chris Mason <chris.mason@...cle.com> wrote:
 
> I did expect delayed allocation to help the write phases of
> compilebench, especially the parts where it writes out .o files in
> random order (basically writing medium sized files all over the
> directory tree).  But, every phase except reads showed huge
> improvements.
> 
> http://oss.oracle.com/~mason/compilebench/ext4/ext-create-compare.png
> http://oss.oracle.com/~mason/compilebench/ext4/ext-compile-compare.png
> http://oss.oracle.com/~mason/compilebench/ext4/ext-read-compare.png
> http://oss.oracle.com/~mason/compilebench/ext4/ext-rm-compare.png

This might make the IO during reads a little easier to see.  The dirs
will look like the kernel after a make -j.  So each directory will have
a bunch of small .c files that are close together and a bunch of .o
files that are randomly created across the tree.

http://oss.oracle.com/~mason/compilebench/ext4/ext4-read.mpg

-chris
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