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MQSeries.net Forum IndexIBM MQ API SupportMQCB to Browse messages ?

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yasaboy
PostPosted: Thu Sep 04, 2014 10:06 pm Post subject: MQCB to Browse messages ? Reply with quote

Voyager

Joined: 23 Jun 2014
Posts: 88

Hi,

Can we use the MQCB function to browse and display messages rather than getting them from the queue.

MQCB :

Code:
MQCB(Hcon, MQOP_REGISTER, &cbd, Hobj, &md, &gmo, &CompCode, &Reason);


Is there any latency related improvement in browse than get ? Thanks
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PaulClarke
PostPosted: Thu Sep 04, 2014 11:38 pm Post subject: Reply with quote

Guardian

Joined: 17 Nov 2005
Posts: 938
Location: New Zealand

Yes you can use MQCB to browse a message.

In terms of latency I would expect browse and get to be very similar. To improve latency, over a client anyway, ensure that read-ahead is enabled.

Cheers,
Paul.
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Paul Clarke
MQGem Software
www.mqgem.com
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yasaboy
PostPosted: Fri Sep 05, 2014 12:41 am Post subject: Reply with quote

Voyager

Joined: 23 Jun 2014
Posts: 88

@PaulClarke thank you for the reply. We tried using MQOO_READ_AHEAD as a output option and anyway it didn't give any significant amount of improvement. Anyway it is between 150-160 microseconds per message in read-ahead , browse and get options.

Code:
O_options = MQOO_INPUT_AS_Q_DEF |MQOO_READ_AHEAD| MQOO_FAIL_IF_QUIESCING;


I'm curious to know why you say there is no significant effect in browse and get functions ?
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PaulClarke
PostPosted: Fri Sep 05, 2014 12:54 am Post subject: Reply with quote

Guardian

Joined: 17 Nov 2005
Posts: 938
Location: New Zealand

MOO_READ_AHEAD is an open option, not an output option. And it does make a very significant difference over a client. So, either you have always had it on or, for some reason, you are not allowing it because of client version/threading etc.

I'm curious to know why you think there would be a significant difference in the browse and get functions. Clearly I would expect get to be slow since it has more work to do but I would expect the latency over a client to be determined by the round-trip time which should be about the same.

Cheers,
Paul.
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Paul Clarke
MQGem Software
www.mqgem.com
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