| Author |
Message
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| angka |
 Posted: Wed Aug 01, 2007 11:20 pm Post subject: .NET MQ memory issue |
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Chevalier
Joined: 20 Sep 2005
Posts: 406
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Hi all,
I wrote a code for MQ Client using .net c# to poll a queue and wait for 10 secs and retry after 10 secs and I realise from the task manager that the memory keep increasing even when there is no message. below are my code please take a look.
After connecting to the QMgr and open the Queue...
| Code: |
public partial class MQ_PRISMS : Form
{
MQ_API objMQ = new MQ_API();
string strReturn = null;
//Some other methods to connect and open Queue
public void MQGetMessage()
{
while (true)
{
strReturn = objMQ.MQGetMessage();
if (strReturn != "2033" & strReturn != "Message Committed")
{
//do something
}
}
}
}
class MQ_API
{
MQQueueManager queueManager;
MQQueue queue;
MQQueue queueException;
MQMessage queueMessage;
MQPutMessageOptions MQPutMsgOpt;
MQGetMessageOptions MQGetMsgOpt;
string strExceptionQueueName;
string strReturn;
string strMessage;
Boolean blnSuccess = false;
Boolean blnDBSuccess = false;
Boolean blnConnectSuccess = false;
Boolean blnOpenSuccess = false;
int intGetMsgOptions;
int intPutMsgOptions;
string strApplDataID;
public string MQGetMessage()
{
intGetMsgOptions = MQC.MQGMO_CONVERT | MQC.MQGMO_SYNCPOINT | MQC.MQGMO_WAIT;
strExceptionQueueName = Properties.Settings.Default.ErrorQueueName;
try
{
queueMessage = new MQMessage();
queueMessage.CharacterSet = 437;
queueMessage.Encoding = 546;
MQGetMsgOpt = new MQGetMessageOptions();
MQGetMsgOpt.Options = intGetMsgOptions;
MQGetMsgOpt.WaitInterval = 10000;
queue.Get(queueMessage, MQGetMsgOpt); //"jump to CATCH when no message in the queue.."
strMessage = queueMessage.ReadString(queueMessage.MessageLength);
strApplDataID = queueMessage.ApplicationIdData;
strApplDataID = strApplDataID.Substring(0, 8);
//Do some other stuff...
}
catch (MQException MQexp)
{
if (MQexp.ReasonCode == 2033)
{
strReturn = Convert.ToString(MQexp.ReasonCode);
}
else
strReturn = "MQException: " + Convert.ToString(MQexp.ReasonCode);
}
catch (Exception exp)
{
strReturn = "Exception: " + exp.Message;
}
return strReturn;
}
}
} |
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| Vitor |
| Posted: Wed Aug 01, 2007 11:59 pm Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
|
Which version of MQ & .NET are you using? I have a faint memory (!) of a memory leak in early versions of the .NET support.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| angka |
| Posted: Thu Aug 02, 2007 12:16 am Post subject: |
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Chevalier
Joined: 20 Sep 2005
Posts: 406
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Hi,
I am using MQ V6.000 and .net Framework V2.
thought the garbage collector should handle the new object?
Thanks. |
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| Vitor |
| Posted: Thu Aug 02, 2007 12:34 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
|
Ok, so not what I was thinking of clearly. But 2 other points occur:
1) You should apply some maintenance to MQ - the plain v6 is not all it could be;
2) You may want to consider using .NET 1.1 instead.
A lot of things should happen in this world. A surprising number of them don't, for one reason or another. 
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| angka |
| Posted: Thu Aug 02, 2007 12:57 am Post subject: |
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Chevalier
Joined: 20 Sep 2005
Posts: 406
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Hi,
for MQ client I am using the newest version available but MQ server only v6.0. i cant downgrade the .net version cos some other application using it.
but the code is quite simple.. the basic for MQ Client to get messages MQ from server. =(
thanks. |
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| Vitor |
| Posted: Thu Aug 02, 2007 1:01 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
|
| angka wrote: |
but the code is quite simple.. the basic for MQ Client to get messages MQ from server. =(
|
Indeed so. 
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| angka |
| Posted: Thu Aug 02, 2007 6:07 pm Post subject: |
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Chevalier
Joined: 20 Sep 2005
Posts: 406
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Hi,
Any coding suggestion what to do?
Thanks. |
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| fjb_saper |
| Posted: Thu Aug 02, 2007 9:04 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20697
Location: LI,NY
|
| angka wrote: |
Hi,
Any coding suggestion what to do?
Thanks. |
Make sure you close correctly any MQ resource used after you are done with it. It is never a good thing to leave the resource for automatic garbage collection ... You should explicitely close(or release) the resource when no longer needed. This makes for better resource availability and memory management. Also use resource pools whenever available and appropriate.
Enjoy 
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MQ & Broker admin |
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| angka |
| Posted: Fri Aug 03, 2007 1:04 am Post subject: |
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Chevalier
Joined: 20 Sep 2005
Posts: 406
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Hi,
But MQmessage for .net can't release the object. it doesnt have any method to release. I believe i kept new the MQmessage object and tt why the memory increase over time. GC will only collect it when it gets to a value.
Thanks |
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| kevinf2349 |
| Posted: Fri Aug 03, 2007 4:51 am Post subject: |
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Grand Master
Joined: 28 Feb 2003
Posts: 1311
Location: USA
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Why are you 'polling' the queue in the first place?
Why not just issue a get with an unlimitied wait? |
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| angka |
| Posted: Sun Aug 05, 2007 5:53 pm Post subject: |
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Chevalier
Joined: 20 Sep 2005
Posts: 406
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Hi,
I did a get with unlimited wait too, the memory increase but slower only. as long as there is a message the memory increase.. i left it over the weekend with no message sent the memory stays. I think shld be the GC not doing the work as expected.
I tried out on the debugger mode using VS.net, the MQ message object i created around 20 instances ago willl only be release then. this maybe due to debugger mode but i believe the release may take a while to release the object too.
I tried sending messages at 10 per sec, the memory increase like mad.. it gets over 500 mb in around 30 mins...  |
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| kevinf2349 |
| Posted: Sun Aug 05, 2007 7:48 pm Post subject: |
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Grand Master
Joined: 28 Feb 2003
Posts: 1311
Location: USA
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| Have you tried disposing of the message area within the same loop that you create the new message area? |
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| angka |
| Posted: Sun Aug 05, 2007 8:59 pm Post subject: |
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Chevalier
Joined: 20 Sep 2005
Posts: 406
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What you mean by disposing? MQMessage does not have tt method dispose.
Thanks |
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