msgseg

Description

The msgseg parameter specifies the maximum number of message segments system-wide. A message on a message queue consists of one or more of these segments. The size of each segment is set by the msgssz parameter.

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

Value

Default: 1536

When to Change

Modify this parameter to reserve the appropriate amount of memory for messages. Increase this parameter if you need more memory for message segments on the system. Decrease the value to limit the amount of memory used for message segments.

Notes

If this parameter is too large, memory may be wasted (saved for messages but never used). If this parameter is too small, some messages that are sent will not fit into the reserved message buffer space. In this case, a msgsnd(2) system call waits until space becomes available.