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KGMON(8) FreeBSD 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 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 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 specified with -p, the output file name will be gmon-<id>.out instead of gmon.out. And if the cpuid argument is "all" , the operation 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. FreeBSD 14.1-RELEASE-p8 August 10, 2021 FreeBSD 14.1-RELEASE-p8