HP-UX Directory Server 8.1 Performance Tuning and Sizing Guidelines

• Access logging enabled to ensure SSL functions correctly

Table 7 shows that the connect-and-bind performance of HPDS 8.1 is degraded about 872% when

SSL is enabled.

Table 7: Performance in relation to SSL connection setting (Enabled or Disabled)

SSL Connection

Searches per second

Enable 1963.33

Disable 7259.05

For all the previous data collections, the “bind once as root” option is selected when running the

benchmark test with the rsearch script. It means once an ldap connection is initialized, all the

following search operations will use the same connection. In an SSL environment, overhead usually

occurs during the connection setup time. To investigate how the extra workload affects the

performance, the “bind for every operation” option is selected when running the benchmark test with

the ldclt script. This ensures a new connection is created for all search requests.

The rsearch and ldclt scripts are located in the /opt/dirsrv/bin directory on a system

installed with HPDS 8.1.

Additional tuning reference

There are several ways to manage the directory server’s performance by limiting the amount of

resources the server uses to process client search requests. For example, the size limit attribute, time

limit attribute, and so forth can be tuned to limit the resources the server uses. Increasing the

checkpoint interval can increase the performance of directory write operations in certain rare

conditions. Be cautious when tuning attributes related to the transaction log, because setting these

attributes and other configuration attributes inconsistently may cause the directory to be unstable. The

“Tuning Directory Server performance” chapter of the

HP-UX Directory Server administrator guide

provides more detailed information to help optimize directory server performance.

Appendix A: HPDS 8.1 performance test details

Test Environment

Operating system

The HP-UX 11i v3 release (Update 8, March 2011) was selected to illustrate the performance of HP-

UX Directory Server 8.1 on HP Integrity servers.

System parameter tuning

All the system parameters on the test machines are tuned as recommended in the “Sizing and tuning

overview” section.

General directory server configuration

For all the test data to be comparable, assume the data is collected based on the following directory

server configuration (unless specified separately within each data collection section.)

1. Logging: access log: off

error log: on

audit log: off

2. No referrals