OL2.3 vs OL2.4 perf issues

[Quanah Gibson-Mount <quanah@zimbra.com>]

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.

--Quanah

--

Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
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