"Basham, Richard R" wrote:
>
> Here is an exchange I had with Tomasz a while back regarding mbuff and buffer sizes.
> I am not sure if this is the definitive answer but it may help a few people out.
>
> It is a little long winded but it covers a lot of investigation effort.
...
>
> I checked SHMAX and yes indeed it is set to 32 MB. It says in the file not to
>change that value >because so many others depend on that value. Therefore I will not
>change that value.
AFAIK, modifying SHMMAX via sysctl is perfectly safe, although I don't
know if it affects the problem you're seeing. Don't bother with
changing the source, just echo a new val (in bytes) to
/proc/sys/kernel/shmmax. I've found it to be safe at 700 megs, which
was used to help Oracle chew through large data sets. I believe there
is a maximum on the size at around a gig, but I'm not sure where that is
documented. (If it is documented.)
--Matt Sherer
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