The current default value for PoolMax is 4. The actual
value to set depends on the hardware configuration and the expected
usage in your environment.
For optimal use, we recommend that the lower limit of PoolMax
not be less than the number of CPUs that are available. The upper
limit must be determined by the load pattern on your server. Generally,
the upper limit should be set to twice the number of CPUs cores
on your server.
Modify the existing PoolMax value
Log in to the WebSphere Administrative
Console.
In the navigation tree, click Servers > Application Servers > [server name] > Java and Process Management > Process Definition >Java Virtual Machine > Custom Properties.