AT&T UNIX™PC Unix System V Users Manual - tenox

KTUNE(7) KTUNE(7)
NAME
ktune -kernel tunable parameters
SYNOPSIS
ktune [options] [files]
ktune [ -d ] [ [ -r ] [ nbuf=n ] [ lnode=n ] [ nfile=n ]
[ nproc=n ] [ ntext=n ] [ ncHst=n ] [ npbuf=n ]
[ ncall=n ] [ nttyhog=n ] [ kem=filename]
DESCRIPTION
Ktune provides a way to change values of the following parameters
which reside in the file 'filename' specified in the argument
'kem=filename'. If the argument 'kem=filename' is absent, the program
modifies /unix.
The table below summarizes the parameters that can be set using ktune .
nbuf
ninode
nfile
nproc
ntext
Parameter Minimum Value Default
nbuf 25 100
ninode 80 400
nfile 80 300
nproc 30 100
ntext 24 75
nclist 32 150
npbuf 4 16
ncall 16 32
nttyhog 0 1024
Number of system buffers available. These buffers are
used mostly by block device drivers for file system operations.
Range: 25 up to system capacity.
Number of memory-resident inodes that can be allocated at
any time. The inode is the focus of all file activity in UNIX.
There is a unique inode allocated for each open file, each
current directory, each mounted-on file, text file, and the
root.
Range: 80 up to system capacity.
Total number of files that can be opened on the system at
any time. One file structure is allocated for each
open/creaUpipe call. Note that while nfile controls the
total number of files that can be open at any given time,
another parameter, nopen, sets the number of files that can
be open at any given time by any single process. Nopen is
not tunable, and is currently set to 80.
Range: 80 up to system capacity.
Number of processes that can exist at any time. One process
structure is allocated per active process, and it contains
all the data about the process.
Range: 30 up to system capacity.
Number of text structures allocated in the kernel. One text
structure is allocated per pure procedure on swap devices.
Range: 24 up to system capacity.
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