Re: /proc/sys/kernel/shmmax

["GÃrard BIGOT"]

On Jan 20, 2008 3:07 PM, Luca Ferrari <fluca1978@xxxxxxxxxxx> 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 /proc file 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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