DragonFly kernel List (threaded) for 2012-08
Re: PostgreSQL 9.2 benchmarks
On Mon, Aug 27, 2012 at 04:11:59PM +0100, Mindaugas Rasiukevicius wrote:
> I am CC-ing tech-kern as well.
Good. I was not sure in which of the numerous NetBSD lists I should have
posted to ;)
> > On Mon, Aug 27, 2012 at 11:31:30AM +0100, Mindaugas Rasiukevicius wrote:
> > > Francois Tigeot <firstname.lastname@example.org> wrote:
> > You're right, it's much better with a Unix socket. NetBSD follows the
> > FreeBSD curve up to 24 clients (including the peak).
> > Sadly, it all goes downhill from there.
> Good to know. Do you have a graph somewhere?
I took some time to run an almost complete serie with NetBSD+AF_UNIX and
update the pdf document (see page 3).
Get it there: http://dl.wolfpond.org/benchs/Pg-benchmarks.2012-08.pdf
> > Performance with 32 clients is on par with the initial 127.0.0.1 results.
> > Tests with 48 or more clients are still running and will probably yield
> > bad results too.
> > The system is almost completely unresponsive. Just seeing 'ls' appear on
> > the remote shell I use takes about 20 seconds with a long pause between
> > the two letters.
> This is somewhat unexpected. Do you use some unusual configuration or just
> a plain GENERIC kernel? Could you perhaps run pgbench under lockstat(8)?
I'm using an almost-default installation with GENERIC.
A small top(1) extract:
CPU23 states: 0.0% user, 0.0% nice, 100% system, 0.0% interrupt, 0.0% idle
Memory: 12G Act, 6312M Wired, 15M Exec, 12G File, 2895M Free
Swap: 24G Total, 24G Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
0 root 96 0 0K 55M CPU/2 279:29 896% 896% [system]
380 ftigeot 79 0 6324M 6322M select/6 22:24 0.00% 0.00% postgres
818 ftigeot 85 0 6327M 42M select/0 0:12 0.00% 0.00% postgres