Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Performance Tuning Guide

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### ORB Thread Pool Parameters

The ORB thread pool contains a task queue and a pool of threads. Tasks or jobs are inserted into the task queue and free threads pick tasks from this queue for execution. Do not set a thread pool size such that the task queue is always empty. It is normal for a large application’s Max Pool Size to be ten times the size of the current task queue.

The Application Server uses the ORB thread pool to:

- Execute every ORB request.

- Trim EJB pools and caches.

Thus, even when one is not using ORB for remote-calls (via RMI/ IIOP), set the size of the threadpool to facilitate cleaning up the EJB pools and caches.

Set ORB thread pool attributes under Configurations > config-name > Thread Pools > thread-pool-ID, where thread-pool-ID is the thread pool ID selected for the ORB. Thread pools have the following attributes that affect performance.

- Minimum Pool Size: The minimum number of threads in the ORB thread pool. Set to the average number of threads needed at a steady (RMI/ IIOP) load.

- Maximum Pool Size: The maximum number of threads in the ORB thread pool.

- Idle Timeout: Number of seconds to wait before removing an idle thread from pool. Allows shrinking of the thread pool.

- Number of Work Queues

In particular, the maximum pool size is important to performance. For more information, see Thread Pool Sizing.

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