Re: shared memory settings: SHMMAX and SHMALL

Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp> writes:
> > If I have 512MB of memory in my system, excluding swap
> > space,
> > what values do I want to set for SHMMAX and SHMALL?
>
> That depeneds on your kernel implemetaion and hardware. I found
> followings in /usr/include/asm/shmparam.h on my Linux box.
>
> here PAGE_SIZE == 4096. So I guess we cannot have more than 128MB for
> the shared memory on this platform if above comment is correct.

You can recompile the kernel with the new defaults or just change them on
a live system (kernel 2.2.x or higher) with something like:

echo 419430400 >/proc/sys/kernel/shmall
echo 419430400 >/proc/sys/kernel/shmmax

You pick the numbers, of course.
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matthew rice <matt(at)starnix(dot)com> starnix inc.
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