Re: configure shmmax on MAC OS X

Hello,

I found that if you SHMALL value was less than your SHMMAX value,
the value wouldn't take.

J

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
>
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