Linux kernel system parameters

The following table describes Linux kernel parameters with one instance of PostgreSQL. If you are using additional instances of PostgreSQL, you need to multiply the values by the number of instances.

Parameter	Description	Value
semmsl	Determines the maximum number of semaphores per semaphore set	S: 100 M: 150 L: 250
semmns	Determines the total number of semaphores	S: 600 M: 4000 L: 32000
semopm	Determines the maximum number of semaphore operations per semop(2) system calls	100
semmni	Checks the maximum number of semaphore sets for the entire Linux system	S: 300 M: 400 L: 1000
kernel.shmall	Determines the total size of shared memory pages	S: 2 GB M: 4 GB L: 8 GB
kernel.shmmax	Determines the size of shared memory	S: 2 GB M: 4 GB L: 8 GB
kernel.shmmni	Determines the total size of shared memory segments	S: 1024 M: 2048 L: 4096

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PostgreSQL UNIX kernel parameters