Re: OL2.3 vs OL2.4 perf issues

[Howard Chu <hyc@symas.com>]

Quanah Gibson-Mount wrote:
> --On July 28, 2009 10:36:08 AM -0700 Quanah Gibson-Mount
> <quanah@zimbra.com>  wrote:
>
> > I've been spending some time perf testing OL 2.4 in relation to OL 2.3.
> > Unfortunately, RE24 is noticeably slower than 2.3 was.  Results of simple
> > auth testing with slamd show:
> >
> > OL 2.3: 21,745 auths/second
> >
> > OL 2.4: 15,733 auths/second
> >
> > So OL 2.4 is 6,000 auths/second (aka 12,000 searches/second) slower than
> > 2.3.  I.e., 27% slower.
> >
> > Howard committed a patch that slightly helps some situations, and
> > Hallvard has a rewrite of part of the lber library that I've been testing
> > that he'll commit soon.  That helps somewhat:
> >
> > OL 2.4 with howard and hallvard's patches: 17,086 auths/second.
> >
> > That still leaves us over 4,500 auths/second (or 9000 searches/second)
> > slower than RE2.3. I.e., 21.5% slower.  Which is quite a substantial gap.
>
> Here are the numbers with --enable-debug=no.
>
> OL 2.3: 22,356 auths/second
>
> OL 2.4: 17,396 auths/second
>
> So for 2.3, this is an improvement of 611 auths/second.  For 2.4, this is
> an improvement of 1,663 auths/second.  Which I find rather significant. ;)

OK, that lends some weight to the idea that we have too many assert()s in the 
2.4 code...

--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/