Kernel parameter shmctl change

[zum]

How do I check my parameter setting for shmctl, and if needed how to I change the setting? I'm running Redhat 4.

Thanks.

 

[macd68]

sysctl -a | grep shm
vm.hugetlb_shm_group = 0
kernel.shmmni = 4096
kernel.shmall = 2097152
kernel.shmmax = 33554432

If you are looking for details about a shared memory segment the man page for shmctl should be helpful. Also ipcs and ipcrm are the userspace tools for manipulating and displaying certain details for System V IPC constructs.

 

[jgunkel]

After you have used sysctl to tweak the setting while running, you can make the change automatic at boot time by adding a line like this to /etc/sysctl.conf:

kernel.shmmax = 134217728