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MQ CICS Problem

 
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Titinao
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PostPosted: Fri Oct 08, 2010 3:34 am    Post subject: MQ CICS Problem Reply with quote

I need your help on one issue I am currently having on TEST environment with one MQ Queue and an online transaction. For the last couple of months we had received reports saying that transaction xxxx is consuming a lot of resources on TEST env and it has caused a problems to other systems and teans. First thing we notice is that TEST env gets really slow then when we check the online transactions we see that tran xxxx is consuming most of the CPU resources.

This transaction is triggered every time a message is put on a MQ queue. Once the transaction starts its execution it:
1. Opens the queue and then
2. It gets and processes each message on the queue and will do this until no more messages are found on the queue,
3. Closes the queue.

We have seen that lately we are receiving much more online transactions that use this queue and once the transaction is running first messages on the queue are processed really fast, but after a while it gets really slow and it takes around 2 seconds to process one single message.

We want to do a tuning to this transaction to fix the problems we are having on TEST because, despite the fact this problem is not happening on PROD yet, it has high chances of happening on a near future once.

First thing we want to do is to modify the program associated to transaction xxxx, so that it will not read the queue until all of them are processed. I want to add a control step like: after reading/processing 1000 messages the transaction will end, so the rest of messages would be processed by another instance of the same transaction and each instance of the transaction will process 1000 messages itself.

I also want to mention that the program associated to the transaction is doing a Syncpoint for every message, I wonder if this can be affecting the performance.

I want your help to determine it this is a good approach to fix the problem I am having and also I would appreciate your support and knowledge on MQ for any recommendation from your side that we could apply.
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PostPosted: Sun Oct 10, 2010 11:22 pm    Post subject: MQ Series CICS Reply with quote

Problem might be with increased number of input messages in the MQ.
.2 cents from my side.

1. EXEC CICS SYNCPOINT ( cause more I/Os) might be the cause.
As no of transaction transactions increases, I/O takes slightly longer.

2. cost of MQGET when a message is not immediately available is almost twice the cost of MQGET when a message is available, because the adapter re-issues the get request.
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PostPosted: Wed Oct 13, 2010 1:15 am    Post subject: Re: MQ Series CICS Reply with quote

Thank for your reply.

I will modify the program to do the SYNCPOINT after 100 messages are processed, but regarding the other recommendation you do, I was told that according to internal policies, the recommendation is to have just one instance of the transaction for all the messages in the queue. System programmers say that we canīt initiate another instance of the transaction, thus all messages in the queue must be processed by the first instance of the transaction trigeered.

Do you think program can have memory issues? I mean, Program does not have GETMAIN instructions or something like that. Could this affect performance?

I forgot to mention this is Cobol - CICS program.

Thank you
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PostPosted: Wed Oct 13, 2010 2:15 am    Post subject: Reply with quote

is the message loaded into the program's working-storage,
or is the get with a pointer to the message?

1000 messages before transaction termination means 1000 messages (via syncpoints)
are maintained until the implicit commit - task termination.

you may experience performance improvement if you were to end the task (transaction)
at 100 messages instead of 1000.

the messages are not removed from the queue until commit - which does not happen in cics until task (transaction) termination.

you probably have much larger memory-resources allocated in production cics
that you have in test cics,
thus the 'filling/using up of cics resources'
has more of an impact in test.

Quote:
I was told that according to internal policies, the recommendation is to have just one instance of the transaction for all the messages in the queue. System programmers say that we canīt initiate another instance of the transaction, thus all messages in the queue must be processed by the first instance of the transaction trigeered.


you could have more than one instance of the transaction processing messages simultaneously.

the transaction should
  • read and process 100 msg - or until queue is empty- LT 100
  • if queue reads were 100, do a start tran for the next instance and end the current instance
  • if queue reads were LT 100, do not START, allow the next message on the queue to trigger its own instance

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PostPosted: Thu Oct 14, 2010 2:31 am    Post subject: Reply with quote

Thank you very much for your reply!. This is really making me think about all the possible approaches and the best one or my case.

I have 3 more questions for you:

- does the syncpoints act like a commit, or is the actual end the transaction the one that does the commit?

. If I start another instance of my transaction once I reach message 100 (and there are more messages on the queue) and just before ending the current instance of my transaction, which is the first message the second instance will read, message 101?

- Is it still good to do the syncpoint every message is processed?. I am afraid that if I do not it that way then I might lose messages if something happend on the process.

Thanks again
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PostPosted: Thu Oct 14, 2010 3:24 am    Post subject: Reply with quote

you can syncpoint and provide a reference.

e.g. the process is
process message
syncpoint A
process message
syncpoint B
process message
syncpoint C
process message
ROLLBACK syncpoint B

A ROLLBACK is only good to the last commit, last syncpoint (w/o reference), or to sycnpoint reference.

a commit is not the same as a syncpoint.
you can rollback thru syncpoints to a previous,
but you can not rollback a commit.

as i said, cics does not like explicit COMMITs, but they can be done.

and since a syncpoint requires lots of resources
they should not be done too frequently - not every message.

depends upon how the cics and mqs is set-up,
read the manuals, because it is possible to have multiple tasks reading the same queue,
without skipping/missing messages or double processing of message.

you only lose messages when you commit before the message is processed,
as long as the mqs is setup to have recoverable queue.

answers to many of your questions, depends on how your site is setup.
so you have to TEST, TEST TEST
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