Re: Very big shm area

[William Lee Irwin III <wli@holomorphy.com>]

On Sun, Jun 02, 2002 at 07:21:21PM +0200, Kilobug wrote:
> Hello,
> 	I wanted to know if it is possible to have a very big system V 
> 	shared memory segment (say about 1Gb) ?
> 	I've quickly looked into the source code of shm.c and shm.h in ipc/ 
> 	and I've read the following:
> /*
>  * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can
>  * be increased by sysctl
>  */
> But how far is it possible to increase them ? And which sysctl must be 
> done ?
> Thank you for answering,

ls /proc/sys/kernel/sh* and the names shouldn't be too tough from there.
I'd be concerned about exercising this code on a virgin 2.4.17 as ISTR
bugfixes for sysv ipc/shm cropping up in later kernel versions, though
I can't say I've tracked this area very closely. Hopefully someone who
does can chime in here and enlighten us both.


Cheers,
Bill