Tunable Kernel Parameters

Table of Tunable Kernel Parameters
Appendix A
69
ProcessMgmt:
Memory
maxtsiz Maximum allowable process text segment size, used by
unchanging executable-code (32-bit processes). Manpage:
maxtsiz (5).
ProcessMgmt:
Memory
maxtsiz_64bit Maximum allowable process text segment size, used by
unchanging executable-code (64-bit processes). Manpage:
maxtsiz (5).
ProcessMgmt:
Process
maxuprc Maximum number of processes that any single user can
have running at the same time, including login shells, user
interface processes, running programs and child processes,
I/O processes, etc. If a user is using multiple, simultaneous
logins under the same login name (user ID) as is common
in X Window, CDE, or Motif environments, all processes
are combined, even though they may belong to separate
process groups. Processes that detach from their parent
process group, where that is possible, are notcounted after
they detach (line printer spooler jobs, certain specialized
applications, etc.). Manpage: maxuprc (5).
Miscellaneous:
Users
maxusers Maximum number of users expected to be logged in on the
system at one time; used by other system parameters to
allocate system resources. Manpage: maxusers (5).
File System:
LVM
maxvgs Maximum number of volume groups configured by the
Logical Volume Manager on the system. Manpage: maxvgs
(5).
Accounting max_acct_file_size Maximum size of the accounting file. Manpage:
max_acct_file_size (5).
Asynchronous
I/O
max_async_ports System-wide maximum number of ports to the
asynchronous disk I/O driver that processes can have open
at any given time. Manpage: max_async_ports (5).
Memory Paging max_mem_window Maximum number of group-private 32-bit shared memory
windows. Manpage: max_mem_window (5).
ProcessMgmt:
Threads
max_thread_proc Maximum number of threads that any single process can
create and have running at the same time. Manpage:
max_thread_proc (5).
IPC: Message mesg Enable or disable IPC messages at system boot time.
Manpage: mesg (5).
Kernel Crash
Dump
modstrmax Maximum size, in bytes, of the savecrash kernel module
table that contains module names and their locations in
the file system. Manpage: modstrmax (5).
IPC: Message msgmap Size of free-space resource map for allocating shared
memory space for messages. Manpage: msgmap (5).
Table A-1 Tunable Kernel Parameters in Alphabetic Order (Continued)
Category Tunable Description