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Slow enqueue during load

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talalanwar

Posted: Sun Jul 06, 2014 10:35 pm Post subject: Slow enqueue during load

Newbie

Joined: 26 Jan 2013
Posts: 7

We are facing performance degradation issues on MQv7.5. Enqueue time is on average 45-65 msec per message using IBM Integration Bus with MQOutput Node on a local Queue Manager. Time increases when enqueue and dequeue happens in parallel. If dequeue stops average time is below 10 msec. For this specific application, 10 threads are queuing and 19 threads are dequeuing in parallel. 7.5 Million messages are normally processed by this application within four hours. We have also seen the same behavior for other applications too. Is this the normal behavior of MQ or we need any optimization. Please guide if environment needs to be optimized.

fjb_saper

Posted: Sun Jul 06, 2014 10:50 pm Post subject:

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY

When a number of things like that happen in parallel it is apparently more efficient if all the gets are made under syncpoint (at least from a J2EE perspective, extrapolating to the message broker here).
You could try and see if that gives you any better/worse performance...
For this type of volume you may need to optimize your environment with more than average queue buffers. (change the qm.ini, bounce the qmgr, delete and recreate the queues in question).
This may avoid a build up in the queue and favor a "hand of in memory".

Let us know what worked best for you. Remember your mileage will vary...
I'd expect you getting the biggest bang from the bigger queue buffers...
Can you keep up with the instances to avoid writing to the queue?

Make sure the logs and queues are set up on the fastest disk you can find. (san with fiberoptic channel?)

Have fun

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