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Re: shared memory in computational chemistry



On Saturday, 07.04.2007 at 12:08 -0400, Greg Folkert wrote:

> On Sat, 2007-04-07 at 16:06 +0100, Dave Ewart wrote:
> > On Friday, 06.04.2007 at 15:39 -0700, Francesco Pietra wrote:
> > 
> > > 1) How to set shmmax in debian? 
> > 
> > For the running kernel, echo a value to /proc/sys/kernel/shmmax - to
> > make it a permanent setting (i.e. set automatically at subsequent
> > reboots), include the setting in /etc/sysctl.conf:
> > 
> > kernel.shmmax=whatever
> 
> Umm, shmmax is auto-adjusted now in the 2.6 kernel. This is not the
> real reason he is having difficulty.

Hmm, since which kernel version, out of interest? 

The reason I ask is that I found it necessary to set SHMMAX for an AMD64
Sarge machine with 16GB RAM running as a PostgreSQL database server and
improved performance significantly as a result.  For compatability
reasons with the hardware, I couldn't use the most recent kernel: it's
running 2.6.12.

Dave.
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