Hello! > Thank you very much. I didn't know that. I set my shmmax to 4000000000 but you're right, we will see to use a 64 bits system ;) My experience with this amount of memory in Debian Etch works much better in a 64bit environment. BIGMEM kernel handles pages in a way that the performance is a bit degraded. > I wanted to give to postgres 4GB. So I tryied to set shmmax to 4Go : > > sysctl kernel.shmmax=4294967296 > > > But it doesn't work : if I launch after this modification this command : > > sysctl kernel.shmmax > > it gives me this response : > > kernel.shmmax = 0 > > Why? Is there a limit to shmmax? I don't see limits in shmmax but the command you're typing is wrong. To set a value you need to do: sysctl -w kernel.shmmax=VALUE or alternatively: cat VALUE > /proc/sys/kernel/shmmax Don't forget to write in your /etc/sysctl.conf: kernel.shmmax=VALUE Without spaces. This will make your setting persistent. Regards Flavio -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
