So an update to my quest of knowledge... 
https://en.wikipedia.org/wiki/Unix_domain_socket and 
http://www.thomasstover.com/uds.html  

The bottom line is this form of "socket" is integral for any process to process 
communication not just networking, amy I going down the right path?

________________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of 
Tracy Adams <[email protected]>
Sent: Thursday, April 14, 2016 9:38 AM
To: [email protected]
Subject: OMVS (TCPIP) internals question

I am trying to understand the function of TCPIP and its "max sockets".  We are 
experiencing a problem that happens infrequently where our CICS application 
closing down the DataPower port with an error that indicates max sockets has 
been reached.  IBM support has confirmed this in a dump.  They say our max and 
current values are at 65,535 when the dump was initiated and to increase our 
maxsockets setting in BPXPRMxx.  We are set at the default of 64000.  Its 
maximum value is 16 million.  This parameter is in the "network" definition of 
a "a single sockets file system".


What I am grappling with is what is a "single sockets file system" and how the 
heck can we be hitting 65k units of anything?  We are not that big!  (so I 
think)  So who and what consumes all these entries in this single socket file 
system?  How can I monitor this?  Netstat shows active connections between 700 
- 900 so I don't believe this is the right spot to be looking.


Quick explanations would be great, recommendations on readings that will 
clarify would be awesome as well.


TIA,


Tracy

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