Best Practices from Oracle Development's A‑Team

OSB MQ Transport Tuning - Proxy Service threads

Mike Muller
Cloud Solution Architect

The MQ Transport is a polling transport.  At the user defined interval, a polling thread, fired by a timer, checks for new messages to process on a designated queue.  If messages are found, a number of worker thread requests are scheduled to execute via the WebLogic work scheduler.  Each of these worker threads will get messages from the queue and initiate the processing of a proxy service.

The number of worker threads to schedule is based on the following factors:

The queue depth
The number of managed servers
The number of worker threads currently executing for this proxy service
The max number of threads defined for the work manager associated with the proxy service

If a work manager is not assigned to the proxy service, it will use the WLS Default work manager and if a Max Threads Constraint has not been defined for the Default work manager it will use 16 as a default value.  Therefore, without any tuning, the default will result in a maximum of 16 threads concurrently processing for a given MQ Proxy service.  In order to change this, define a new work manager with the desired max thread constraint and assign it to the proxy service via its dispatch policy setting.

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