* seekwatcher IO visualization
@ 2007-08-09 20:53 Andreas Dilger
2007-08-10 3:01 ` Jose R. Santos
0 siblings, 1 reply; 2+ messages in thread
From: Andreas Dilger @ 2007-08-09 20:53 UTC (permalink / raw)
To: Jose R. Santos; +Cc: linux-ext4
I saw on #linuxfs today some graphs and movies by Chris Mason showing
the poor IO locality for ext3 compared to btrfs and XFS. It would be
interesting to run this with ext4+mballoc+delalloc, and a separate
one with the FLEXBG feature enabled to see how that improves the
seeking/locality.
http://oss.oracle.com/~mason/seekwatcher/
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: seekwatcher IO visualization
2007-08-09 20:53 seekwatcher IO visualization Andreas Dilger
@ 2007-08-10 3:01 ` Jose R. Santos
0 siblings, 0 replies; 2+ messages in thread
From: Jose R. Santos @ 2007-08-10 3:01 UTC (permalink / raw)
To: Andreas Dilger; +Cc: linux-ext4
On Thu, 9 Aug 2007 14:53:55 -0600
Andreas Dilger <adilger@clusterfs.com> wrote:
> I saw on #linuxfs today some graphs and movies by Chris Mason showing
> the poor IO locality for ext3 compared to btrfs and XFS. It would be
> interesting to run this with ext4+mballoc+delalloc, and a separate
> one with the FLEXBG feature enabled to see how that improves the
> seeking/locality.
>
> http://oss.oracle.com/~mason/seekwatcher/
>
> Cheers, Andreas
> --
> Andreas Dilger
> Principal Software Engineer
> Cluster File Systems, Inc.
>
I was planing to use seekwatcher to look at fsck activity when using
FLEX_BG since I'm already seeing noticeable improvements by using this
feature alone.
We can try other workloads and see how ext4 compares.
-JRS
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2007-08-09 20:53 seekwatcher IO visualization Andreas Dilger
2007-08-10 3:01 ` Jose R. Santos
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