Sun GlassFish Enterprise Server v2.1.1 Performance Tuning Guide

Tuning NumberOfLocks

Start with the default value. Look for exceptions with the indicated error codes in the Enterprise Server log files. Remember that under normal operations (no ongoing refragmentation) only half of the locks might be acquired by the client application.

To get information on allocated locks and locks in use, use the following command:

hadbm resourceinfo --locks

For example, the output displayed by this command might look something like this:

Node No.     Avail             Free            Waits
0            50000             50000           na
1            50000             50000           na