shmmni

Description

The shmmni parameter specifies the maximum number of shared memory identifiers system-wide.

This parameter is specified in /var/sysgen/mtune/shm.

Value

32-bit Default: 100

64-bit Default: 400

Range: 10-1000

When to Change

Increase this parameter by one (1) for each additional shared memory segment that is required, and also if processes that use many shared memory segments reach the shmmni limit.

Decrease this parameter if you need to reduce the maximum number of shared memory segments of the system at any one time. Also decrease it to reduce the amount of kernel space taken for shared memory segments.