/proc/sys/kernel/shmmax

[Gérard BIGOT]

On Jan 20, 2008 3:07 PM, Luca Ferrari <fluca1978 at infinito.it> wrote:

> Hi all,
> using a 7.1 server I tried to increment the shmmax value in the proc file,
> but
> it seems I cannot get more than 600 MB. I tried to fix it to 1GB but the
> system still has 600MB, is it a parameter fixed in the ubuntu kernel?

 To change the value SHMMAX, you can use either of the following three
methods:

   - This is method I use most often. This method sets the SHMMAX on
   startup by inserting the following kernel parameter in the
   /etc/sysctl.conf startup file:

   # *echo "kernel.shmmax=2147483648" >> /etc/sysctl.conf*

     - If you wanted to dynamically alter the value of SHMMAX without
   rebooting the machine, you can make this change directly to the
/procfile system. This command can be made permanent by putting it
into the
   /etc/rc.local startup file:

   # *echo "2147483648" > /proc/sys/kernel/shmmax*

     - You can also use the sysctl command to change the value of SHMMAX:


   # *sysctl -w kernel.shmmax=2147483648*


>From http://www.idevelopment.info/data/Oracle/DBA_tips/Linux/LINUX_8.shtml ,
obviously ...

G.
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