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Issues in Performance Tesing of OpenLDAP using SLAMD

Hi all,


Currently I am involved in an activity that deals with measuring performance of OpenLDAP on Solaris 10 – x_86 machine.


Hardware Specs –

  1. Two identical servers (Servers ‘NodeA’ and ‘NodeB’) with the following configuration:
    1. Sun Fire X4200 M2 x64 Server
    2. 2x AMD Opteron Model 2220 (2.8GHz/1MB) processor
    3. 1x 4GB PC2-5300 DDR2-667 memory
    4. 2x 146GB HDD 15K RPM (Hardware RAID-1, so available disk space is 146 GB).
  2. One server ‘NodeC’ is used as a traffic injector and has the following hardware configuration:
    1. Sun Fire X4200 M2 x64 Server
    2. 2x AMD Opteron Model 2218
    3. 4x 2GB PC2-5300 DDR2-667 memory
    4. 4x 73GB HDD 10K RPM.

Software installation common to all servers:

  1. JDK 1.6
  2. Symas CDS Version 3.9.3


For traffic injection, SLAMD v2.0.0-alpha1 is installed on NodeC.


Both Node A and B are Mirror-Mode replicas.


The database is having 1 Million subscribers and both the cache sizes are set as follows in slapd.conf :

cachesize       250000

idlcachesize    250000 i.e 25% of the subscriber base.


Two identical SLAMD SearchRate Jobs, one pointing to Node A and other to Node B are run from Node C.

However, there is a wide difference in the number of lookups/sec performed in both the servers.


The read rates obtained vary in the ratio of 1:7 or so on both the servers.


I am using 1 SLAMD client and 2 threads for targeting on 1 server.


If I increase the number of thread, SLAMD starts reporting exceptions.


Please suggest a way by which Predictable/ similar read rates could be achieved on both the servers as both being exactly same.


Thanks a ton in advance for suggesting a solution.



Shilpa Sethi



Plot 6, Electronic City,

Sector - 18,

Gurgaon 122015

Haryana, India 



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