Re: compilebench numbers for ext4

[Chris Mason <chris.mason@oracle.com>]

On Mon, 22 Oct 2007 19:31:04 -0400
Chris Mason <chris.mason@oracle.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