Posted by sibu on March 3, 2009
Semaphore
Semaphore
When you stop all service, the semaphore and shared memory segments have to be removed. If not, you will be able to them using ‘ipcs’ command.
We can remove the segment ID using ‘ipcrm’ command.
#ipcs -a
#ipcrm -s < sem id>
To increase the semaphore values.
# /sbin/sysctl -a | grep sem => To display the Sem values.
# /sbin/sysctl -w kernel.sem=250
Add new value in /etc/sysctl.conf file inorder for the change to persist across system reboots.
# sysctl -f => to save values
You should periodically clean up the shared memory you have allocated using the command ipcrm. A fast way to remove every bit of shared memory you have priviledges for is
ipcs -m | awk ‘{print $2}’ | xargs -n1 ipcrm -m
OR
for i in `ipcs -s | grep nobody | awk '{print $2}'`; do ipcrm -s $i; done
Add A Comment