kgmon(8) - NetBSD Manual Pages

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


NAME

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


SYNOPSIS

     kgmon [-bdhpr] [-c cpuid] [-M core] [-N system]


DESCRIPTION

     kgmon is a tool used when profiling the operating system.  When no argu-
     ments are supplied, kgmon indicates the state of operating system profil-
     ing 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 or gmon-<id>.out file suitable for later analysis by
     gprof(1).

     The options are as follows:

     -b      Resume the collection of profile data.

     -c cpuid
             Operate on the CPU specified by cpuid.  If this option is speci-
             fied with -p, the output file name will be gmon-<id>.out instead
             of gmon.out.  And if the cpuid argument is ``all'' , the opera-
             tion is performed for each cpu.

     -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 or
             gmon-<id>.out file.

     -r      Reset all the profile buffers.  If the -p flag is also specified,
             the gmon.out or gmon-<id>.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.

NetBSD 10.1                     August 10, 2021                    NetBSD 10.1