Re: SMP performance degradation with sysbench

Lorenzo Allegrucci
2007-03-01T17:03:36Z

On Tue, 2007-02-27 at 20:05 +0100, Lorenzo Allegrucci wrote:
> On Tue, 2007-02-27 at 09:02 -0500, Rik van Riel wrote:
> > That still doesn't fix the potential Linux problem that this
> > benchmark identified.
> >
> > To clarify: I don't care as much about MySQL performance as
> > I care about identifying and fixing this potential bug in
> > Linux.
>
> Here http://people.freebsd.org/~kris/scaling/mysql.html Kris Kennaway
> talks about a patch for FreeBSD 7 which addresses poor scalability
> of file descriptor locking and that it's responsible for almost all
> of the performance and scaling improvements.

How does Linux scale with many threads contending for file descriptor
lock?
Has anyone tried to run the test with oprofile?