topic Re: shmmax limitation in Operating System - HP-UX

shmmax limitation

ajitp — Tue, 21 Sep 2010 05:36:08 GMT

I have the OS version 11.31.
I only need to Know, the recommended value for the shmmax parameter is 0x40000000000.
Also some time, on application level trace I get the error message like
shmget() of 17179869184 bytes failed. errno = 12(Not enough space)
Can I set it with the 8 GB RAM and 20 GB SWAP?

Re: shmmax limitation

Dennis Handly — Tue, 21 Sep 2010 06:33:47 GMT

This hex value is way too big, two extra zeros?

Your colleague's thread?
http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1448163

While you can get 17 Gb, only if you have enough swap configured. What is "swapinfo -tam" when it fails?

Re: shmmax limitation

SUDHAKAR_18 — Tue, 21 Sep 2010 08:38:03 GMT

For database servers, ideal shmmax value is equal to physical memory.

find out the physical memory.
#dmesg |grep -i phy
or glance

calculate shmmax in bytes.
phy mem * 1024 *1024

tune the parameter.
#kctune shmmax=value