MQSeries.net :: View topic

WBI_user · Posted: Fri Jan 09, 2009 10:31 am Post subject:

We are running WMB V6 CSD 05 on AIX. We have a simple flow
MQINPUT- MAPPING-MQOUTPUT
The MAP was written to handle products in a sotre. The mapping is not complicated but it has to loop through a large number of repeated records which represent a product. The INPUT is XML message.
In one situation we have a 26M imput message containing 90,000 records, the EG blow up with fail to allocate memory.
We retry the message in our test environment with only the failing flow in its own EG. We also monitor the usage of the EG while the flow is running.
The same message runs fine the first time. The memory used by the EG rises from 400+ M to about 650M and stays there when the flow completes with no failure. We then try with 2 of the same message on the INPUT queue. The EG will always blow up with fail to allocate memory on the second message. Our memory monitor shows that the memory used by the EG when handling the 2nd message rises to exceed 1G which is our limit.
I was under the impression that all memory can be re-used after the first message is done with the flow.
Why is this failing on the second run ? I know that there are things that developers we can do on making the flow more memory efficient. But we (administrators) need some facts before we can ask developers to change their code. Any help on this wil be greatly appreciated.