Tunable Kernel Parameters

Table of Tunable Kernel Parameters
Appendix A
70
IPC: Message msgmax System-wide maximum size (in bytes) for individual
messages. Manpage: msgmax (5).
IPC: Message msgmnb Maximum combined size (in bytes) of all messages that
can be queued simultaneously in a message queue.
Manpage: msgmnb (5).
IPC: Message msgmni Maximum number of message queues allowed on the
system at any given time. Manpage: msgmni (5).
IPC: Message msgseg Maximum number of message segments that can exist on
the system. Manpage: msgseg (5).
IPC: Message msgssz Message segment size in bytes. Manpage: msgssz (5).
IPC: Message msgtql Maximum number of messages that can exist on the
system at any given time. Manpage: msgtql (5).
File System:
Buffer
nbuf System-wide number of static file system buffer and cache
buffer headers. Manpage: nbuf (5).
Miscellaneous:
CD
ncdnode Maximum number of entries in the vnode table and
therefore the maximum number of open CD-ROM file
system nodes that can be in memory. Manpage: ncdnode
(5).
Miscellaneous:
Terminal
nclist Maximum number of cblocks available for data transfers
through tty and pty devices. Manpage: nclist (5).
File System:
Open/Lock
ncsize Inode space needed for directory name lookup cache
(DNLC). NO MANPAGE.
File System:
Open/Lock
nfile Maximum number of files that can be opensimultaneously
on the system at any given time. Manpage: nfile (5).
File System:
Open/Lock
nflocks Maximum combined number of file locks that are available
system-wide to all processes at one time. Manpage: nflocks
(5).
File System:
Open/Lock
ninode Maximum number of open inodes that can be in memory.
Manpage: ninode (5).
ProcessMgmt:
Threads
nkthread Maximum number of kernel threads allowed on the
system at the same time. Manpage: nkthread (5).
ProcessMgmt:
Process
nproc Defines the maximum number of processes that can be
running simultaneously on the entire system, including
remote execution processes initiated by other systems via
remsh or other networking commands. Manpage: nproc
(5).
Miscellaneous:
Terminal
npty Maximum number of pseudo-tty entries allowed on the
system at any one time. Manpage: npty (5).
Table A-1 Tunable Kernel Parameters in Alphabetic Order (Continued)
Category Tunable Description