Re: SHMMAX seems entirely broken in OS X 10.4.2

On Aug 29, 2005, at 8:18 PM, Tom Lane wrote:

> Has anyone been able to set kern.sysv.shmmax above 4MB at all in
> latest
> OS X? I just spent a while trying what seemed every possible
> permutation of setting up /etc/sysctl.conf and editing /etc/rc
> directly,
> and it just fails (symptom: sysctl shows shmmax as -1, and Postgres
> cannot start).
>
yeah, you need to set shmmax and shmall. shmall seems to be measured
in pages.
Here's the settings I've been using:

skittlebrau:/etc root# grep shm rc
# sysctl -w kern.sysv.shmmax=4194305 kern.sysv.shmmin=1
kern.sysv.shmmni=32 kern.sysv.shmseg=8 kern.sysv.shmall=1024
sysctl -w kern.sysv.shmmax=335544320
sysctl -w kern.sysv.shmmin=1
sysctl -w kern.sysv.shmmni=32
sysctl -w kern.sysv.shmseg=16
sysctl -w kern.sysv.shmall=327680

and just to verify:

skittlebrau:/etc root# sysctl -a | grep shm
kern.sysv.shmmax: 335544320
kern.sysv.shmmin: 1
kern.sysv.shmmni: 32
kern.sysv.shmseg: 16
kern.sysv.shmall: 327680

I've been running PG ith 10k shared bufs for a while.

The pain is sometimes /ec/rc gets rewritten :(

--
Jeff Trout <jeff(at)jefftrout(dot)com>
http://www.jefftrout.com/
http://www.stuarthamm.net/