slapd lightweight dispatcher

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

I've done a lot of testing in the last several days on a binary with the 
lightweight dispatcher code enabled (2.3 base), and I just want to say I'm 
a very big fan of it.  It allows slapd to scale under high load at a rate 
I've not previously seen.  I've also played with the multi-conn flag as 
well, and haven't seen it particularly affect the rates when only it is 
enabled, but I haven't tried the lightweight dispatcher without it being 
enabled at the same time.

One thing I'll note about multi-conn is that it requires a variable in 
connection.c to be set to the number of cpu's on the system where slapd 
will be run.  I think this should instead be changed to a parameter in 
slapd.conf (slapd-cpus ??) so one doesn't have to have fixed slapd's for 
given systems.  That same parameter could be used for giving guidelines to 
slapadd/slapdindex as well, and the tool-threads parameter could be 
replaced by the new one.


--Quanah

--
Quanah Gibson-Mount
Product Engineer
Symas Corporation
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