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| Relationship between socket, WAS and MQ connections |
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| HenriqueS |
 Posted: Tue Jun 04, 2013 12:48 pm Post subject: Relationship between socket, WAS and MQ connections |
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Master
Joined: 22 Sep 2006
Posts: 235
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Hello,
Whats the relationship between:
a) Outgoing socket connections from my WAS server (from a defined queue connection factory defined with a maximum of channels);
b) Incoming socket connections arriving at my MQ server.
c) Incoming MQ connections arriving at my MQ server and reported with DISPLAY CONN(*)
d) MaxChannels setting on ini file.
I am asking this because I have seen some differences on these numbers.
Example:
Running netstat -a | grep mymqserver | wc -l at my WAS server returns about the same as running netstat -a | grep mywasserver | wc -l at my MQ server. So this is fine.
Running DISPLAY CONN(*) CONNAME | grep mywasserver | wc -l at my MQ server returns a tottally different number, quite big, usually at 10 times the number of socket connections.
So at the very end, how to I calculate the best option for my MaxChannels setting in the ini file ? I noticed that while my WAS server had a queue connections factory allowing at most 150 connections to my MQ server, there were arriving a lot more connections followoing the report with the DISPLAY CONN(*) CONNAME command.
I always thought this was a 1 (socket WAS) to 1 (socket MQ) to 1 (MQ CONN) relation....but it is looking something like 1-1-10 ! |
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| mqjeff |
| Posted: Tue Jun 04, 2013 12:52 pm Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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| HenriqueS |
| Posted: Wed Jun 05, 2013 2:16 pm Post subject: |
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Master
Joined: 22 Sep 2006
Posts: 235
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| mvic |
| Posted: Wed Jun 05, 2013 2:50 pm Post subject: |
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Jedi
Joined: 09 Mar 2004
Posts: 2080
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| HenriqueS wrote: |
| so, where sharecnv would fit on the formula ? |
You seem to have done a lot of research. You probably now know more than most people here.  So we should be asking you the above question. |
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| HenriqueS |
| Posted: Thu Jun 06, 2013 8:56 am Post subject: |
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Master
Joined: 22 Sep 2006
Posts: 235
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Found this interesting resource regarding TCP/IP Connection usage between WebSphere Application Server V7 and V8, and WebSphere MQ V7...
*http://www-01.ibm.com/support/docview.wss?uid=swg21507483
So I concluded (someone correct me please):
* MaxChannels on the qm.ini = (WAS connection pool + (WAS connection pool x WAS session pool) + incoming DQM conns + internal MQ conns
*Maximum number of conversations = MaxChannels on the qm.ini - (DQM incoming conns + internal MQ conns)
* Maximum number of TCP/IP channel instances = Maximum number of conversations / SHARECNV for the channel being used
Now, what would be the good values for the connection pool, session pool and SHARECNV? I think only your mileage and system load will tell. There is a balance that should be sought on the following variables:
# of WAS threads acessing the connection factory
# of connection and session pools on WAS
# of SHARECNV on MQ
While at same time avoiding a big number of TCP/IP instances (saving the TCP/IP stack resources) and obtaining good throughput. |
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