Fine-grained locking for POSIX local sockets (UNIX domain
hadara at bsd.ee
Tue May 9 15:14:49 UTC 2006
On Tuesday 09 May 2006 03:42, Kris Kennaway wrote:
> On Tue, May 09, 2006 at 03:34:59AM +0300, Sven Petai wrote:
> > > Hmm, with this patch mysql 4.1 seems to crash at startup. I haven't
> > > yet had time to investigate. Is anyone else seeing this?
> > Seems to run fine here with 4.1.18 on amd64, but doesn't seem to make
> > much difference though.
> > I ran the tests again on the 8 core machine with and without rwatsons
> > patch and this time with 6 tests for each setting and generated graphs:
> > http://bsd.ee/~hadara/debug/mysql4/stats.html
> > thr + select smack dynamics with the patch really do look quite
> > interesting
> > PS
> > I'm currently running testround with rwatsons patch +
> > http://people.freebsd.org/~csjp/kern_descrip.c.1145074052.diff + mysqld
> > change davidxu suggested.
> > Are there any other patches out there that I should try ?
> Sorry, I meant
> instead of that patch. Also try turning down HZ to 100, and changing
> the wakeup()s to wakeup_one() in sys/filedesc.h.
I preformed additional tests with the settings you suggested,
updated graphs are available @
* with rwatsons patch + mysqld change suggested by davidxu +
there doesnt seem to be much difference, but in general things seem to be
couple of percent better
mutex profiles for this configuration are available @
with 10 smack threads:
with 100 smack threads:
* second run was with same patches, but HZ set to 100
this helps performance a lot but creates large fluxuations in select results
with >20 threads + thr, sometimes difference between 2 runs with same
settings was 10000+ q/s
I'm currently still testing wakeup() -> wakeup_one() suggestion.
In addition I did full testrun on linux to see how much this hardware
is really capable of... graphs for that are available on the stats page too.
More information about the freebsd-performance