Slapd Performance Under Load

Test Environment

OpenLDAP server (slapd V 2.0.27 ) installed on a Dual Intel(R) Xeon(TM) CPU 2.40GHz with 1GB of RAM running Scientific Linux 3. The size of the LDAP database is 20MB.

Test Description

To emulate cpu load, a simple script is used to run a do-nothing loop which as with nice (see http://linux.about.com/library/cmd/blcmdl1_nice.htm ) value having different process priorities.

The test script (load_cpu):

#!/bin/bash
while [ 1 ] ; do
 echo "" > /dev/null
done

Started using: nice -n 0 ./load_cpu

Test with Script

The graphs below show the average time a request takes to be processed. The left graph is the time/requests relation, the right one the timeout/request relation. Each scenario (with/without load) was done for 4 cycles each represented by one line in the graph.

Test Results

With Load

Without Load

With Indexing

• RUN1 indexed DB,
• RUN2 non-indexed DB,