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| Program on Unix removing messages from queue slowly |
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| BarryB |
 Posted: Wed Aug 18, 2004 8:40 am Post subject: Program on Unix removing messages from queue slowly |
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Acolyte
Joined: 01 Jul 2004
Posts: 53
Location: Vernon Hills, Il
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Hello,
I have a program that 'polls' a queue on Unix, and takes messages off the queue for backend processing. For the last month or so, since its been moved into production, everything has been running very quickly. Messages are being taken off the queue very quickly. As of yesterday messages are being taken off of the queue very slowly now. There is nothing in the MQ logs to show that it is a problem with MQ. I'm wondering though, as I am not a UNIX/AIX guru, could it be something to do with shared memory or something of that nature. People here are thinking its MQ, but I don't see it that way. Any suggestions are welcome.
Thanks,
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| SONDAPISSA |
| Posted: Wed Aug 18, 2004 3:04 pm Post subject: |
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Novice
Joined: 27 Apr 2004
Posts: 14
Location: México
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Hi Barry
the messages are persistance?, the appl use Syncpoint options on get call, if this, then check the number of messages in the unit of work (LOW) of your appl before commit
If the msgs are persistance, check the manager log (lineal or circular), if the log is linear, check for space on the filesystem
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Julio Cuevas Rocha
MQSeries Installation and Configuration Certified
MQSeries Solution Expert Certified |
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| kman |
| Posted: Wed Aug 18, 2004 11:19 pm Post subject: |
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Partisan
Joined: 21 Jan 2003
Posts: 309
Location: Kuala Lumpur, Malaysia
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Barry,
check with the developer what is the program doing. It is likely it is accessing a database or something at the sametime. If so check what is happeing with the database update. Is there locking somewhere.
Also, if this is request reply, is there any waiting on replies that is slowing this down.
You might also consider the resources on the system. Check to see what is going on with the system. Are they slowing down.. which in turns affecting your program?
If everything has been working fine for so long, there must be new introduction in the system that could cause this.
You should also consider any I/O or space requirements in the system.
It may not even be you program.. worth checking at various places.
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| csmith28 |
| Posted: Tue Sep 14, 2004 4:44 pm Post subject: |
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Grand Master
Joined: 15 Jul 2003
Posts: 1196
Location: Arizona
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This is most certainly an application issue. The queue is like a bucket. It holds the messages that are placed in it. It is not the buckets fault if it fills up.
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| mrlinux |
| Posted: Thu Sep 16, 2004 12:30 pm Post subject: |
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Grand Master
Joined: 14 Feb 2002
Posts: 1261
Location: Detroit,MI USA
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Well you can check to see how many open handles that are reading from the queue, if that is a real high number it can cause the MQGET calls to slow down. If you are running MQ ver 5.2 or higher this number would have to be > 80
runmqsc
dis ql(QUEUE_NAME) ipprocs
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IBM Certified Developer MQSeries
IBM Certified Specialist MQSeries
IBM Certified Solutions Expert MQSeries |
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