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Re: openldap profiling tools

Sébastien Georget wrote: 
 I did not mention it because I was looking for a general way to find
 what's the bottleneck in an openldap installation. I can stress the
 server and play with the configuration to find what parameters
 improve performances (reduce failed authentications) but it's a long
 and not so easy process. I thought that server-side performances
 mesuring tools would have help in tuning the configuration with
 information such as

It sounds like you're asking a pretty general question about code profiling then, not something specific to LDAP or OpenLDAP.

 - time spent processing filters - time spent processing acl - time
 spent in backend specific code

On x86 Linux valgrind can be useful here (with calltree module). On Solaris and Linux I use FunctionCheck 1.5.4 for profiling. (Originally written by Yannick Perret, significantly enhanced by me.)

http://freshmeat.net/projects/fncchk/

 - number of connections rejected - peak request/s - ...

 Here is the configuration I am using : - openldap 2.2.27 with 8 bdb
 backends (1 + 7 subordinates) - 250 entries, will certainly grow to
 2000-3000
> What sort of entry cache do you have?
 cachesize 2000 default for other parameters I plan to make tests with
 : idlcachesize, conn_max_pending, timelimit, idletimeout

 Since the bdb files are very small (<200k) I supposed that they stay
 in memory and I dit not look at DB_CONFIG files, should I ?

Probably. Use db_stat -m, that will tell you whether the current (default) settings are working well or not.

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 -- Howard Chu
 Chief Architect, Symas Corp.       Director, Highland Sun
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