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MQSeries.net Forum IndexWebSphere Message Broker SupportIIB Memory Leak

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Phanikumar
PostPosted: Sun Oct 07, 2018 2:18 am Post subject: IIB Memory Leak Reply with quote

Apprentice

Joined: 29 Aug 2016
Posts: 25
Location: Kuwait

Hi All,

Needed your help . We have a memory leak in IIB.

Our Production servers memory is keep on increasing and reaching it to 100% memory utilization.

Details of Our Production Environment are

IIB Version is 10.0.0.3
MQ Version is 8.0.0.10
AIX Version is 7.1

Total Message Flows are 76(All are Integration Projects)

Initially we have 12 GB memory once it reached to 100%, we increased to 20 GB and later we again increased to 40 GB still the issue remains same and keep on increasing.

We have few message flows interacting with oracle database and few message flows interacting with core banking using MQ interface and file services as well, transferring the files between remote servers.

My observations are
1. when we restart the servers memory is back to normal.
2. Memory is not coming back to normal even if we restart the broker.

Regards,
Phanikumar
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fjb_saper
PostPosted: Sun Oct 07, 2018 5:29 am Post subject: Reply with quote

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Joined: 18 Nov 2003
Posts: 19758
Location: LI,NY

So what have you done to isolate and pinpoint the memory leak?
Are you using java compute nodes?

Way too little information for us to help you...
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PeterPotkay
PostPosted: Sun Oct 07, 2018 6:55 am Post subject: Reply with quote

Jedi Council

Joined: 15 May 2001
Posts: 7463

You are very behind in your maintenance running 10.0.0.3. That's 3 years old.

Here is a list of all the fixes in IIB 10.
http://www-01.ibm.com/support/docview.wss?uid=swg27045813

Search for the word "memory" on that page - look at all those results!

Best thing to do is apply the latest fix pack and see if that resolves the issue. Normally I don't like that as a suggestion as it feels like avoiding any real problem solving, but you are so far behind in maintenance and there are so many solved memory leak issues listed I think its reasonable to try that first. You should patch anyway even if you didn't have a memory leak.

But if the memory leak is caused by a poorly written flow, then no amount of patching or reboots is going to help you.
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gbaddeley
PostPosted: Sun Oct 07, 2018 2:37 pm Post subject: Re: IIB Memory Leak Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1886
Location: Melbourne, Australia

Phanikumar wrote:
Hi All,
Needed your help . We have a memory leak in IIB.
Memory is not coming back to normal even if we restart the broker.

Hi Phanikumar.
These statements don't seem to correlate.
Which processes are using the largest amount of memory?
Is swap space being used?
What is the pattern of memory growth over time?
Does the same thing happen on your test servers?
There are cases where IIB IS's gradually increase in memory usage, due to the way they allocate certain buffers. This is "normal" behaviour.
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Phanikumar
PostPosted: Mon Oct 08, 2018 8:43 pm Post subject: Reply with quote

Apprentice

Joined: 29 Aug 2016
Posts: 25
Location: Kuwait

fjb_saper wrote:
So what have you done to isolate and pinpoint the memory leak?
Are you using java compute nodes?

Way too little information for us to help you...


Yes. We are using in three message flows.
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Vitor
PostPosted: Tue Oct 09, 2018 4:55 am Post subject: Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 25250
Location: Ohio, USA

Phanikumar wrote:
fjb_saper wrote:
So what have you done to isolate and pinpoint the memory leak?
Are you using java compute nodes?

Way too little information for us to help you...


Yes. We are using in three message flows.


Then your Java code is leaking. This is a common issue as Java coders typically assume that the JVM will garbage collect memory when they exit their code as it does when Java runs in WAS or a similar container. The JCN does not work that way for good & sufficient reason.

If you think memory is not coming back when you restart the broker, I'd question how you're measuring that and ask you to post your evidence. Unless this is Windows and you're not doing anything that is not a fully controlled stop/start of the broker via the command prompt.
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