[omniORB] Socket reuse by omniORB?

[Duncan Grisby]

On Thu, 2013-01-24 at 05:07 -0800, Igor Polonsky wrote:

> 1) Having created a connection, Visibroker will hold to it
> indefinitely.  But omniORB appears to drop any connections that have
> been idle for about a minute or so.  Could you please confirm if that's
> really the case?  And how can we fine-tune this behavior, if need be?

Yes, that is the case. See the documentation here:

http://omniorb.sourceforge.net/omni41/omniORB/omniORB008.html#htoc100

The configuration parameter that's important is outConScanPeriod, which
defaults to 120 seconds. If you set it to zero, idle connections will
never be closed.

> 2) When omniORB creates a new connection to a certain CORBA server, it
> seems to reuse any open connection to the same server - even if that
> connection has been created by an unrelated process, such as a
> Visibroker-based client running on the same machine.  This brings a few
> questions:
> 
> - Could you please confirm if this is really what's happening?  Or am I
> misinterpreting the observed behaviors?

No. There is no way that omniORB could do such a thing. What are you
seeing that makes you think that is the case?  Certainly the operating
system will reuse client-side port numbers over time, but only once the
previous connection from that port is completely closed down.

> 3) Can anyone please suggest some good reading on this subject?  I'd
> like to understand how apps such as CORBA clients interact with the
> Windows OS when they create (and share?) connections.  And also how
> CORBA connections consume other system resources, such as NP memory
> pool, etc.  I'd like to become a slightly less dumb user of CORBA.

Most of these concerns are specific to a particular CORBA
implementation. There is quite a lot of detail about how omniORB behaves
in its manual, in particular chapter 8 that talks about connection and
thread management.

Cheers,

Duncan.

-- 
 -- Duncan Grisby         --
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