KGMON(8)

KGMON(8) | System Manager's Manual | KGMON(8)

# NAME

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

# SYNOPSIS

kgmon | [-bdhpr] [-M core] [-N system]

# 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(1)). 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.
-d
  Enable debug output.
-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 /netbsd.
-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

/netbsd
  the default system
/dev/kmem
  the 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

config(1), gprof(1)

# HISTORY

The kgmon command appeared in 4.2BSD.

June 6, 1993 | NetBSD 8.0