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| Thousands of instances of MQ classes |
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| MABeatty1978 |
 Posted: Tue Apr 12, 2016 7:30 am Post subject: Thousands of instances of MQ classes |
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Acolyte
Joined: 17 Jul 2014
Posts: 54
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I have a multi threaded java application that I've been tasked with monitoring the threads externally. I am using the "jmap" utility provided by the jdk to look into my process and see if there are instances of the thread Classes. (If there is a better way to do this, I'm all ears) All is great there.
However, in using the tool, I discovered that there are well over a 1000 instances of the MQQueue and MQQueuemanager classes and they are using (comparitivley) a lot of memory. Looking through the code of my application, I can only see where I instanstiate MQQueue 9 times, only 5 of them should be used at any given time. Numbers are similar with MQQueuemanager class.
I'm worried that I'm not property closing/destroying the Objects and that I may run into memory issues.
The saving grace is that I do see the values "self-managing" as they go up and down by a few hundred and don't seem to be in a runaway state.
Can anyone explain what I'm looking at? Is this normal MQ behavior? Is there something else I can look at? Is this due to something MQ is doing in the background?
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| tczielke |
| Posted: Tue Apr 12, 2016 8:37 am Post subject: |
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Guardian
Joined: 08 Jul 2010
Posts: 941
Location: Illinois, USA
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I ran jmap on one of my MQ java sample PUT programs. The java program only creates one MQQueueManager, MQQueue, and MQPutMessageOptions instance. I noticed as I started to put more messages on the queue, the MQPutMessageOptions instance count started to grow in the jmap output, eventhough I wasn't creating more instances. The MQQueueManager instances stayed at 2, and the MQQueue instances stayed at one. So it does look like internally the MQ java code might be creating more instances of some of these classes, even if your code is not explicitly creating them.
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Working with MQ since 2010. |
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| tczielke |
| Posted: Tue Apr 12, 2016 8:48 am Post subject: |
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Guardian
Joined: 08 Jul 2010
Posts: 941
Location: Illinois, USA
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Correction, it was the MQPMO instances that were growing, not the MQPutMessageOptions instances. To quote Emily Litella, "Nevermind!". 
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Working with MQ since 2010. |
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