Re: stupid question about shmmax, shmmni and shmall...
I bookmarked a fairly decent description of these parameters a while
back:
http://www.puschitz.com/TuningLinuxForOracle.shtml#SettingSharedMemory
Maybe you already know this, but you can also set these parameters in
/etc/sysctl.conf. That way they persist between reboots, etc.
-Ron-
2009-03-05_13:43:30-0500 Giacomo Mulas <gmulas@oa-cagliari.inaf.it>:
> Hello, I am trying to run a demanding quantum chemistry program on a cluster
> of multiprocessor machines. Each machine has 2 dual-core opterons and 16Gb
> of RAM, and is running a 64 bit kernel (currently 2.6.26) and userspace
> (lenny) system. Interprocess communications among processes on the same
> node go via shared memory (a lot of it), hence I need to set it to the
> maximum possible.
>
> Can somebody tell me what are the maximum supported values for shmmax,
> shmmni and shmall (I know I can set them via /proc/sys/kernel pseudofiles)
> or (even better!) tell me how I can calculate them? Is it likely that a
> too large value of shmmax or the other two can cause applications to
> segfault?
>
> Thanks in advance,
> Giacomo Mulas
>
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