On Fri, 2008-08-15 at 09:45 -0400, Theodore Tso wrote:
quoted text
> On Fri, Aug 15, 2008 at 08:46:01AM -0400, Chris Mason wrote:
> > Whoops the link above is wrong, try:
> > 
> > http://oss.oracle.com/~mason/compilebench
> 
> Thanks, I figured it out.
> 
> > It is worth noting that the end throughput doesn't matter quite as much
> > as the writeback pattern.  Ext4 is pretty solid on this test, with very
> > consistent results.
> 
> There were two reasons why I wanted to play with compilebench.  The
> first is we have a fragmentation problem with delayed allocation and
> small files getting forced out due to memory pressure, that we've been
> working for the past week. 

Have you tried this one:

http://article.gmane.org/gmane.linux.file-systems/25560

This bug should cause fragmentation on small files getting forced out
due to memory pressure in ext4.  But, I wasn't able to really
demonstrate it with ext4 on my machine.

-chris



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