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MQSeries.net Forum IndexGeneral IBM MQ SupportSVRCONN channel instances per thread

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mq__quest
PostPosted: Mon Sep 11, 2017 1:15 pm Post subject: SVRCONN channel instances per thread Reply with quote

Novice

Joined: 21 Aug 2017
Posts: 10

Hello,
I'm using perfharness tool and sending messages to MQ(V9) in 1 thread, and when I check the SYSTEM.DEF.SVRCONN status, I'm seeing 2 instances. I"ve tested this multiple times and noticed n*2 SYSTEM.DEF.SVRCONN instances running per n threads. I thought only 1 instance would start per thread. could someone explain this, please?



dis chs(SYSTEM.DEF.SVRCONN) ALL
4 : dis chs(SYSTEM.DEF.SVRCONN) ALL
AMQ8417: Display Channel Status details.
CHANNEL(SYSTEM.DEF.SVRCONN) CHLTYPE(SVRCONN)
BUFSRCVD(4176) BUFSSENT(4174)
BYTSRCVD(3612652) BYTSSENT(1185784)
CHSTADA(2017-09-11) CHSTATI(16.48.04)
COMPHDR(NONE,NONE) COMPMSG(NONE,NONE)
COMPRATE(0,0) COMPTIME(0,0)
CONNAME(1.3.2.293) CURRENT
EXITTIME(0,0) HBINT(300)
JOBNAME(0000442D000001D4) LOCLADDR(::ffff:11.3.2.299(1419))
LSTMSGDA(2017-09-11) LSTMSGTI(16.48.15)
MCASTAT(RUNNING) MCAUSER(rbmp)
MONCHL(OFF) MSGS(4173)
RAPPLTAG(JMSPerfHarness) SECPROT(NONE)
SSLCERTI( ) SSLKEYDA( )
SSLKEYTI( ) SSLPEER( )
SSLRKEYS(0) STATUS(RUNNING)
STOPREQ(NO) SUBSTATE(MQICALL)
CURSHCNV(1) MAXSHCNV(1)
RVERSION(08000005) RPRODUCT(MQJM)


AMQ8417: Display Channel Status details.
CHANNEL(SYSTEM.DEF.SVRCONN) CHLTYPE(SVRCONN)
BUFSRCVD(7) BUFSSENT(6)
BYTSRCVD(1448) BYTSSENT(1416)
CHSTADA(2017-09-11) CHSTATI(16.48.03)
COMPHDR(NONE,NONE) COMPMSG(NONE,NONE)
COMPRATE(0,0) COMPTIME(0,0)
CONNAME(1.3.2.293) CURRENT
EXITTIME(0,0) HBINT(300)
JOBNAME(0000442D000001D3) LOCLADDR(::ffff:11.3.2.299(1419))
LSTMSGDA(2017-09-11) LSTMSGTI(16.48.03)
MCASTAT(RUNNING) MCAUSER(rbmp)
MONCHL(OFF) MSGS(4)
RAPPLTAG(JMSPerfHarness) SECPROT(NONE)
SSLCERTI( ) SSLKEYDA( )
SSLKEYTI( ) SSLPEER( )
SSLRKEYS(0) STATUS(RUNNING)
STOPREQ(NO) SUBSTATE(RECEIVE)
CURSHCNV(1) MAXSHCNV(1)
RVERSION(08000005) RPRODUCT(MQJM)
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RogerLacroix
PostPosted: Tue Sep 12, 2017 2:25 pm Post subject: Re: server-conn channel instances per thread Reply with quote

Jedi Knight

Joined: 15 May 2001
Posts: 3020
Location: London, ON Canada

mq__quest wrote:
check the SYSTEM.DEF.SVRCONN status

First off, NOBODY or more correctly NO application should be using the SYSTEM.DEF.SVRCONN channel. Create a unique channel for your application or have your MQAdmin do it.

mq__quest wrote:
noticed n*2 SYSTEM.DEF.SVRCONN instances running per n threads

So, check the code - it sounds like the application is opening 2 connections per thread.

Regards,
Roger Lacroix
Capitalware Inc.
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mq__quest
PostPosted: Wed Sep 13, 2017 7:27 am Post subject: Re: server-conn channel instances per thread Reply with quote

Novice

Joined: 21 Aug 2017
Posts: 10

RogerLacroix wrote:

mq__quest wrote:
noticed n*2 SYSTEM.DEF.SVRCONN instances running per n threads

So, check the code - it sounds like the application is opening 2 connections per thread.


But I'm seeing the same issue with another testing tool(JMeter), wondering if I need to check any configurations on MQ side. The tools are using binding file to connect to mq to put to clustered alias queue.
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mqjeff
PostPosted: Wed Sep 13, 2017 8:02 am Post subject: Reply with quote

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Joined: 25 Jun 2008
Posts: 17448

If you're using bindings, then you're not using any svrconns.
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bruce2359
PostPosted: Wed Sep 13, 2017 11:06 am Post subject: Reply with quote

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Joined: 05 Jan 2008
Posts: 7845
Location: US: west coast, almost. Otherwise, enroute.

For clarity, there are two choices for 'bindings,' namely: Server-bindings and Client-bindings. Server-bindings send MQI calls cross-memory (within an LPAR), while Client-bindings send MQI calls cross-network.
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mq__quest
PostPosted: Wed Sep 13, 2017 11:18 am Post subject: Reply with quote

Novice

Joined: 21 Aug 2017
Posts: 10

bruce2359 wrote:
For clarity, there are two choices for 'bindings,' namely: Server-bindings and Client-bindings. Server-bindings send MQI calls cross-memory (within an LPAR), while Client-bindings send MQI calls cross-network.


sorry, I wasn't clear earlier. I meant .binding file with TRANSPORT(CLIENT).
I have this in the file
DEFINE QCF(myCF) QMANAGER() CHANNEL(SYSTEM.DEF.SVRCONN) HOSTNAME(11.3.2.299) PORT(1419) TRANSPORT(CLIENT)
DEFINE Q(myQueue) QUEUE(TEST.ALIAS) QMANAGER() TARGCLIENT(JMS)
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vinay.gollapalli
PostPosted: Thu Sep 14, 2017 2:27 am Post subject: Reply with quote

Novice

Joined: 22 Aug 2017
Posts: 15

They are 2 difference calls one MQICALL and another one is RECEIVE call ,it getting created by your app where it tries to make multiple calls and also see MSGS there is a difference in both the calls.
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hughson
PostPosted: Fri Sep 15, 2017 3:08 pm Post subject: Re: SVRCONN channel instances per thread Reply with quote

Shaman

Joined: 09 May 2013
Posts: 728
Location: Bay of Plenty, New Zealand

mq__quest wrote:
Hello,
I'm using perfharness tool and sending messages to MQ(V9) in 1 thread, and when I check the SYSTEM.DEF.SVRCONN status, I'm seeing 2 instances. I"ve tested this multiple times and noticed n*2 SYSTEM.DEF.SVRCONN instances running per n threads. I thought only 1 instance would start per thread. could someone explain this, please?

From your channel status output I can see that this is a JMS applcation:-

mq__quest wrote:
RAPPLTAG(JMSPerfHarness) RPRODUCT(MQJM)

Quite often, you will see that JMS applications make two MQ Connections, one for the JMS Connection, and one for the JMS Session. This is quite normal.

You will be able to see these two connections if you use the following command while your application is running.

Code:
DISPLAY CONN(*) TYPE(ALL) ALL WHERE(CHANNEL EQ SYSTEM.DEF.SVRCONN)

or if you have lots of other things also using that channel then try

Code:
DISPLAY CONN(*) TYPE(ALL) ALL WHERE(APPLTAG EQ 'JMSPerfHarness')

If you want to know what your application is doing, why not run an Application Activity Trace on it. You'll be able to see how many connections it makes and what each of those connections do.

Cheers,
Morag
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IBM MQ Technical Education Specialist
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mq__quest
PostPosted: Mon Sep 18, 2017 6:18 am Post subject: Re: SVRCONN channel instances per thread Reply with quote

Novice

Joined: 21 Aug 2017
Posts: 10

[quote="hughson"]
mq__quest wrote:


mq__quest wrote:
RAPPLTAG(JMSPerfHarness) RPRODUCT(MQJM)

Quite often, you will see that JMS applications make two MQ Connections, one for the JMS Connection, and one for the JMS Session. This is quite normal.

You will be able to see these two connections if you use the following command while your application is running.



Thanks very much, Morag. It makes sense now. And yes, I do see 2 conns with the channel.
Thanks again.
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