[OpenAFS-devel] fsync/nofsync performance numbers on Solaris

[Christopher D. Clausen]

Robert Banz <banz@umbc.edu> wrote:
> I know this isn't a super-scientific test, but, I wanted to get an
> idea of what sort of write performance changes you see on Solaris
> with different filesystems, using, or not using fsync()'ing all over
> the fileserver...
> [snip]
> Yes, that really is a 4x performance boost on writes.  w00t, as the
> kids say...

Being one of these "w00t" saying kids, I can state similar speed 
improvements in vos moves between our servers, which are now nearly all 
running 1.4.2 namei + fsync patches on sun4x_510 (with the single 
exception of a lone Debian machine using back ported 1.4.2 packages 
without mods.)  Volume moves of certain largish volumes with lots of 
small files used to take literaly 3 hours and the vos move time has now 
been reduced to a few minutes or in some cases 10s of seconds.  A 
significant improvement.  I'm all for getting these patches into the 1.5 
branch and into a stable release at some point in time.  We have not 
encountered any problems as a result of these fsync mods and hope others 
are willing to try them out as well.

<<CDC
-- 
Christopher D. Clausen
ACM@UIUC SysAdmin