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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » Broker JVM Threading Model - In regard to Java Computes (v6)

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Paul D
PostPosted: Wed Mar 21, 2007 8:27 pm    Post subject: Broker JVM Threading Model - In regard to Java Computes (v6) Reply with quote

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Joined: 16 May 2001
Posts: 200
Location: Green Bay Packer Country
I'm trying to get an understanding of how the broker's JVM does threading for java code invoked from a Java Compute. I understand the JVM is running inside the broker's PID. Does it consume/use one thread or multiple theads. Do you do something progromatically to make any of his happen? It looks shared and single threaded to us as we recently added a cache table to our code and could see it being updated from two different flows. We don't have any explicit thread related code in it. The doc talks quite a bit about an input node. This is NOT that. We are trying to understand from a Java Compute perspective in the middle of a flow. Is there any way to adjust these threads if there is just one or a pre-set number. Any code considerations for this?
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fjb_saper
PostPosted: Thu Mar 22, 2007 1:58 am    Post subject: Reply with quote

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Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
From the documentation: There is one JVM per execution group.
The rest is just common sense...?
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jefflowrey
PostPosted: Thu Mar 22, 2007 3:45 am    Post subject: Reply with quote

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Right, so.

There's one JVM per EG. That means each EG is a separate runtime.

Each instance of a message flow is a thread in an EG. That means that all JCNs in a flow will run in the instance thread (or a thread tied to the instance thread). So you won't get one thread for all the ESQL, and then one thread for each JCN, you just get one thread.
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