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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » Additional Instances of messageflow.

Additional Instances of messageflow.

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narki

Posted: Sun Oct 14, 2007 2:34 pm Post subject: Additional Instances of messageflow.

Acolyte

Joined: 19 Dec 2005
Posts: 67

There is an issue with throughput of one of messageflow. Message flow has i/p node and MQget node and sevreal subflows.
There are only 8 main messageflows in execution group. Also there is database insert and select.
Now we are considering either to increase the number of instances or create another execution group and deploy
same messageflow in other execution group. I heard that deploying same messageflow in two execution group has
beter performance. But I am considering to increase the nuber of instances first and see if throughput
matches the requirement, if not then deploy the same messageflow in the diffrent execution group.

Any suggestions.

jefflowrey

Posted: Sun Oct 14, 2007 2:37 pm Post subject:

Grand Poobah

Joined: 16 Oct 2002
Posts: 19981

A general rule of thumb is to have one or two EGs for each processor in the machine.

An absolute rule of thumb when dealing with performance is - find out where the bottleneck is.

If it's the database insert that's taking the most time when processing messages, then there might be nothing you can do in Broker to solve the problem -because for example, it's the DB that needs to be tuned or is CPU or IO bound and not Broker.
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narki

Posted: Sun Oct 14, 2007 3:15 pm Post subject:

Acolyte

Joined: 19 Dec 2005
Posts: 67

I do not think there is any database issue. sameflow was running in 2.1. and it has passed the same stress test. Onlychange we mad is got rid of Aggregate node and used MQGet nodes. Jeff I agree with you number of execution group depend should be same as number of CPU. What will happen if you have more execution group then #of CPU. Right now I do not have muchflexibility of changing the code, which option is better i.e. eith number of instances or same flow in two diffrent execution group.

fjb_saper

Posted: Sun Oct 14, 2007 6:23 pm Post subject:

Grand High Poobah

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

You might want to go back and keep the aggregate node. The performance of it has been greatly improved compared to 2.1 especially if you are in 6.0 or running in 5.x with the change to queues for the aggregate nodes...

Enjoy

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