Linux - How to set semaphore values settings , Increse the semaphores

How to set semaphore values settings

To increase or set the semaphores follow the bellow steps.

To list the semaphores use the command ipcs

[localhost/]# ipcs -ls

------ Semaphore Limits --------
max number of arrays = 128
max semaphores per array = 250
max semaphores system wide = 32000
max ops per semop call = 32
semaphore max value = 32767

To change semaphore setting use the below commands

  #  vi /etc/sysctl.conf

Add the below line into the file /etc/sysctl.conf

kernel.sem = 250        256000  32      1024

The below command will make the semaphore setting permanently to take effect without rebooting the machine.

  # sysctl -p

[localhost/]# ipcs -ls

------ Semaphore Limits --------
max number of arrays = 1024
max semaphores per array = 250
max semaphores system wide = 256000
max ops per semop call = 32
semaphore max value = 32767

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