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| JMS behaviour and MQGMO_WAIT |
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| zpat |
 Posted: Fri Jan 27, 2012 12:41 pm Post subject: JMS behaviour and MQGMO_WAIT |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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We have a JMS client application that is apparently making a very large number of MQGETs, hundreds a second, on an empty queue.
MQ accounting information would appear to confirm this MQGET volume.
It's supposed to have a 10 second wait limit - which I assume is programmed in JMS as receive(10000). We don't have the source code.
I've run an API trace with MA0W and I can see a lot of MQCB calls but not as many MQGETs as I expected.
When/how does JMS (on version WMQ 7013) use MQCB as opposed to using MQGET with MQGMO_WAIT?
The client is Linux, the QM is AIX (both 7013). |
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| fjb_saper |
| Posted: Fri Jan 27, 2012 7:02 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Can you get hold of the code snippets?
One grave suspicion comes to mind: are we dealing with an MDB and they significantly changed (reduced) the polling interval?
Have fun 
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| zpat |
| Posted: Fri Jan 27, 2012 10:24 pm Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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No, it's a stand-alone application, not using WAS or any transaction server
I will probably have to raise a PMR to get more guidance on this issue.
Shame there isn't some sort of "pacing" option on channel definitions to limit how many MQI calls are accepted per second. |
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| fjb_saper |
| Posted: Sat Jan 28, 2012 1:58 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| zpat wrote: |
No, it's a stand-alone application, not using WAS or any transaction server
I will probably have to raise a PMR to get more guidance on this issue.
Shame there isn't some sort of "pacing" option on channel definitions to limit how many MQI calls are accepted per second. |
Even on a stand alone application you can use a message listener. I believe the polling interval is set at the connection factory level...
You might want to check the values involved.
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