How do I fix issues of really poor performance

[Rob Tanner <rtanner@linfield.edu>]

Hi,

I'm replacing an old Netscape server running on a 296 MHz dual processor 
Solaris 5.7 (sun4u sparc) box with OpenLDAP 2.3.27 running on a single 
2.4GHz processor Intel box running Fedora Core 4.  I have duplicated one 
of my hierarchies -- approx 9000 entries.  There is an index on an 
attribute called deptaffiliationcodes (on both systems) which I'm using  
as a search filter to make sure everything is working.  Dumping the 
results to /dev/null, a search on the Netscape server takes typically 35 
milliseconds to complete.  The exact same search on the OpenLDAP server 
takes between 2.5 to 3.5 seconds.  And that's way too slow for me to put 
the OpenLDAP server into production.

I am using the bdb backend and the example DB_CONFIG file which sets the 
cache size to 268435456 bytes, which is bigger than the actual size of 
dn2id.bdb and id2entry.bdb combined (about 16Mb).  What other factors 
can affect performance?

Any help would be most appreciated.

Thanks,
Rob


--

Rob Tanner
UNIX Services Manager
Linfield College, McMinnville OR