shmem.5 (2010 09)

shmem(5) shmem(5)

(Tunable Kernel Parameters)

NAME

shmem - enable or disable System V shared memory

DESCRIPTION

The

shmem tunable is obsolete. The System V IPC shared memory subsystem is always enabled.

Shared memory is an efﬁcient InterProcess Communications (IPC) mechanism. One process creates a

shared memory segment and attaches it to its address space. Any processes looking to communicate with

this process through the shared memory segment, then attach the shared memory segment to their

corresponding address spaces as well. Once attached, a process can read from or write to the segment

depending on the permissions speciﬁed while attaching it.

WARNINGS

Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parame-

ter values. After installation, some tunable parameters may no longer be at the default or recommended

values. For information about the effects of installation on tunable values, consult the documentation for

the kernel software being installed. For information about optional kernel software that was factory

installed on your system, see HP-UX Release Notes at

http://www.hp.com/go/hpux-core-docs

AUTHOR

shmem was developed by HP.