Tunable Kernel Parameters

Interprocess Communication (IPC) Subsystem
IPC Parameter Summary
Chapter 5
33
Shared Memory Parameter Summary
The following parameters control allocation of space for shared memory.
See also “Overview of Shared Memory Operation” on page 38.
IPC: Semaphore semmsl Maximum number of individual System V IPC
semaphores per semaphore identifier. Manpage: semmsl
(5).
IPC: Semaphore semume Maximum number of IPC semaphores that a given process
can have undo operations pending on. Manpage: semume
(5).
IPC: Semaphore semvmx Maximum value any given IPC semaphore is allowed to
reach (prevents undetected overflow conditions).
Manpage: semvmx (5).
IPC: Share core_addshmem_read Flag to include readable shared memory in a process core
dump. Manpage: core_addshmem_read (5).
IPC: Share core_addshmem_write Flag to include read/write shared memory in a process
core dump. Manpage: core_addshmem_write (5).
IPC: Share shmem Enable or disable shared memory at system boot time.
Manpage: shmem (5).
IPC: Share shmmax Maximum allowable shared memory segment size (in
bytes). Manpage: shmmax (5).
IPC: Share shmmni Maximum number of shared memory segments allowed on
the system at any given time. Manpage: shmmni (5).
IPC: Share shmseg Maximum number of shared memory segments that can
be attached simultaneously to any given process.
Manpage: shmseg (5).