Re: configure shmmax on MAC OS X

Tom:

I used sysctl -A to see the kernel state, I got:
kern.sysv.shmmax: -1

It looks the value is too big!

Thanks!

Qing
On Apr 13, 2004, at 12:55 PM, Tom Lane wrote:

> Qing Zhao <qzhao(at)quotefx(dot)net> writes:
>> My suspision is that the change i made in /etc/rc does not take
>> effect.Is there a way to check it?
>
> sysctl has an option to show the values currently in effect.
>
> I believe that /etc/rc is the correct place to set shmmax on OSX 10.3
> or
> later ... but we have seen prior reports of people having trouble
> getting the setting to "take". There may be some other constraint
> involved.
>
>> sysctl -w kern.sysv.shmmax=4294967296 // byte
>
> Hmm, does sysctl work for values that exceed the range of int?
>
> There's no particularly good reason to try to set shmmax as high as you
> are trying anyhow; you really don't need more than a couple hundred meg
> in Postgres shared memory. It's better to leave the kernel to manage
> the bulk of your RAM.
>
> regards, tom lane
>