a dump of the operating system's profile buffers
is a tool used when profiling the operating
system. When no arguments are supplied, kgmon
indicates the state of per-CPU operating system profilings as
“running”, “off”, or “not
). If the
flag is specified,
extracts profile data from the operating
system and produces a file for each CPU suitable for later analysis by
The options are as follows:
- Resume the collection of profile data.
- Operate on the CPU specified by
cpuid, instead of all of them.
- Stop the collection of profile data.
- Extract values associated with the name list from the
specified core instead of the default
- Extract the name list from the specified
system instead of the default
- Dump the contents of the profile buffers into a
gmon-<id>.out file, where
“id” is the ID of the CPU.
- Reset all the profile buffers. If the
-p flag is also specified, the profile files
are generated before the buffers are reset.
If neither -b
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
- default system
- default memory
Users with only read permission on /dev/kmem
change the state of profiling collection. They can get profile files with the
warning that the data may be inconsistent if profiling is in progress.
command appeared in