topic Shared memory segments in Operating System - HP-UX

Shared memory segments

Unix Team — Fri, 27 Jan 2006 12:02:47 GMT

We are in the process of migrating an app from HP to AIX and the following question came up. We are comparing 32bit AIX5.2 to 32bit HPUX 11i

AIX has a limit of 11 shared memory segments per process, do we know how many does HP have?, just to sense comparison versus the prior environment?

Re: Shared memory segments

A. Clay Stephenson — Fri, 27 Jan 2006 12:11:03 GMT

That is a tunable (shmseg) under HP-UX and the default (off the top of my head) is 120 but can be increased upto shmmni (the system-wide number of shm segments) and shmmni is also tunable.

Re: Shared memory segments

James R. Ferguson — Fri, 27 Jan 2006 12:19:10 GMT

Hi:

In comparison to AIX, HP-UX has a plethora of kernel tunables. In my opinion, this is a great benefit.

http://docs.hp.com/en/TKP-90202/index.html

If you want to see your current configuration's settings do:

# kmtune -l

Regards!

...JRF...