# for i in `ipcs | tail -80 |head -75 |cut -d ‘ ‘ -f2`; do ipcrm sem $i; done

ipcrm removes System V interprocess communication (IPC) objects and associated data structures from the system.’ as per the man pages.

If you get the error “Semget: No space left on device here” in apache error log. Make sure that you are replacing nobody with corresponding apache user.

 # ipcrm sem `ipcs|grep nobody|awk ‘{print $2}’`

or

# ipcrm sem `ipcs|grep apache|awk ‘{print $2}’`

or

View the sem value using the below command

# ipcs -ls

or

 # cat /proc/sys/kernel/sem

and increase the value

 # echo “32000 32000 512 512″ > /proc/sys/kernel/sem

This happens on most of the server which has high apache actvity.