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NAME

kgmon — generate a dump of the operating system's profile buffers

SYNOPSIS

DESCRIPTION

kgmon is a tool used when profiling the operating system. When no arguments are supplied, kgmon indicates the state of operating system profiling as “running”, “off”, or “not configured” (see config(8)). If the -p flag is specified, kgmon extracts profile data from the operating system and produces a gmon.out file suitable for later analysis by gprof(1).

The options are as follows:

-b

Resume the collection of profile data.

-h

Stop the collection of profile data.

-M core

Extract values associated with the name list from the specified core instead of the default /dev/kmem.

-N system

Extract the name list from the specified system instead of the default /bsd.

-p

Dump the contents of the profile buffers into a gmon.out file.

-r

Reset all the profile buffers. If the -p flag is also specified, the gmon.out file is generated before the buffers are reset.

If neither -b nor -h is specified, the state of profiling collection remains unchanged. For example, if the -p flag is specified and profile data is being collected, profiling will be momentarily suspended, the operating system profile buffers will be dumped, and profiling will be immediately resumed.

FILES

/bsd

default system

/dev/kmem

default memory

DIAGNOSTICS

Users with only read permission on /dev/kmem cannot change the state of profiling collection. They can get a gmon.out file with the warning that the data may be inconsistent if profiling is in progress.

SEE ALSO

gprof(1), config(8)

HISTORY

The kgmon command appeared in 4.2BSD.