Re: PostgreSQL 9.2 benchmarks

[Francois Tigeot <ftigeot@xxxxxxxxxxxx>]

Hi Mindaugas,

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 <ftigeot@wolfpond.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

-- 
Francois Tigeot