 > * mlw <markw@mohawksoft.com> [001224 18:06] wrote:
 > > This line works:
 > > /usr/local/pgsql/bin/postmaster -N 32 -B 928 -i -S
 > > -D/home/postgres/pgdev -o "-F -fs -S 4096"
 > >
 > > Where as this line:
 > >
 > > /usr/local/pgsql/bin/postmaster -N 32 -B 1024 -i -S
 > > -D/home/postgres/pgdev -o "-F -fs -S 4096"
 > >
 > > does not.
 > >
 > > Any ideas?
 > > I have 256M of memory, RedHat Linux 7.0, CVS version of Postgres as of
a
 > > couple days ago.
 >
 > I'm just going to guess that you need to consult your OS's
 > documentation and figure out how to raise the amount of system V
 > shared memory available.

 I think Alfred is probably correct. I've run into this before myself. See
the following link:


http://www.postgresql.org/devel-corner/docs/admin/kernel-resources.htm#SYSVI
PC

 The relevant section reads:

 Linux

 The default shared memory limit (both SHMMAX and SHMALL) is 32 MB in 2.2
kernels, but it can be changed in the proc file system (without reboot). For
example, to allow 128 MB:

 $ echo 134217728 >/proc/sys/kernel/shmall
$ echo 134217728 >/proc/sys/kernel/shmmax
You could put these commands into a script run at boot-time.

 Other parameters are sufficiently sized for any application. If you want to
 see for yourself look into /usr/src/linux/include/asm-xxx/shmparam.h and
 /usr/src/linux/include/linux/sem.h.

 Hope this helps,

 Joe




Sun, 24 Dec 2000 20:20:33 -0800
"Joe Conway" <joe@conway-family.com>
Re: Upper limit on number of buffers?
On Sun, 24 Dec 2000, Joe Conway wrote:

>  Linux
> 
>  The default shared memory limit (both SHMMAX and SHMALL) is 32 MB in 2.2
> kernels, but it can be changed in the proc file system (without reboot). For
> example, to allow 128 MB:
> 
>  $ echo 134217728 >/proc/sys/kernel/shmall
> $ echo 134217728 >/proc/sys/kernel/shmmax
> You could put these commands into a script run at boot-time.

On redhat 6.2 I know that you can use /etc/sysctl.conf to do this as well.

Just add this to /etc/sysctl.conf.

kernel.shmall = 134217728
kernel.shmmax = 134217728

After this, your tunables will be restored every time that the system boots.

Mike


Fri, 29 Dec 2000 11:29:21 -0600 (CST)
Michael J Schout <mschout@gkg.net>
Re: Upper limit on number of buffers?
Michael J Schout wrote:
> 
> On Sun, 24 Dec 2000, Joe Conway wrote:
> 
> On redhat 6.2 I know that you can use /etc/sysctl.conf to do this as well.
> 
> Just add this to /etc/sysctl.conf.
> 
> kernel.shmall = 134217728
> kernel.shmmax = 134217728
> 
> After this, your tunables will be restored every time that the system boots.

I can confirm that that applies under Debian as well, although there is
also some stuff in the startup script for Debian to configure files max
specifically for PostgreSQL.

Cheers,
				Andrew.
-- 
_____________________________________________________________________
           Andrew McMillan, e-mail: Andrew@catalyst.net.nz
Catalyst IT Ltd, PO Box 10-225, Level 22, 105 The Terrace, Wellington
Me: +64 (21) 635 694, Fax: +64 (4) 499 5596, Office: +64 (4) 499 2267

Mon, 01 Jan 2001 11:18:03 +1300
Andrew McMillan <Andrew@catalyst.net.nz>
Re: Upper limit on number of buffers?