Re: FW: Changing the default configuration (was Re:

Hi everyone,

Just looked on the IBM website for info relating to shared memory and
IPC limits in AIX, and found a few useful-looking documents:

The Interprocess Communication (IPC) Overview
http://www-1.ibm.com/support/docview.wss?rs=0&context=SWG10&q=shmget&uid=aix15f11dd1d98f3551f85256816006a001d&loc=en_US&cs=utf-8&cc=us&lang=en#1.1
"This document defines the interprocess communication (IPC) and is
applicable to AIX versions 3.2.x and 4.x."

Lots of the stuff here is very intro-level, but some still looks useful.

vmtune Parameters
http://www-1.ibm.com/support/docview.wss?rs=0&context=SWG10&q=shmget&uid=aix16934e2f123d4ab3785256816006a0252&loc=en_US&cs=utf-8&cc=us&lang=en
"This document discusses the vmtune command used to modify the Virtual
Memory Manager (VMM) parameters that control the behavior of the memory
management subsystem. This information applies to AIX Versions 4.x."

And an obscure reference to the AIX shmget(2) manpage says that there is
a non-tunable maximum shared-memory segment size of 256MB:

http://www.unidata.ucar.edu/packages/mcidas/780/mcx/workstation.html#aix

Hope some of this is useful.

Regards and best wishes,

Justin Clift

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