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MQSeries.net Forum Index » General IBM MQ Support » max connections

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techno
PostPosted: Fri Sep 30, 2005 11:32 pm    Post subject: max connections Reply with quote

Chevalier

Joined: 22 Jan 2003
Posts: 429
there are two settings I have seen:

1. Default maximum outstanding connection requests queued at a TCP/IP port

2. Maxchannels, maxactivechannels in qm.ini

which one takes precedence? Or am I understanding it differently? Or whichever is hit first, will be effective?

In case of (1): will it be counting all the active receiving channels at qmgr listening port?
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wschutz
PostPosted: Sat Oct 01, 2005 3:44 am    Post subject: Reply with quote

Jedi Knight

Joined: 02 Jun 2005
Posts: 3316
Location: IBM (retired)
They are two different things.

The MaxActiveChannels limits the maximum number of active channels running at one time.... (of course )...

The "listener backlog" parameter:
Quote:
ListenerBacklog=number
Override the default number of outstanding requests for the TCP/IP listener.

When receiving on TCP/IP, a maximum number of outstanding connection requests is set. This can be considered to be a backlog of requests waiting on the TCP/IP port for the listener to accept the request. The default listener backlog values are shown in Table 5.


This limits how many "requests" to get a channel going (think rcvr and svrconn) and be queued. Its not related to how many are actually running. So if suddendly, you have 1000's of mq clients trying to start a channel at once, you might bump into this restriction.

If the requests come in slowing enough that no backlog is built-up, then eventually MAXACTIVECHANNELs would restrict you.
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-wayne
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