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pmc(1) [netbsd man page]

PMC(1)							    BSD General Commands Manual 						    PMC(1)

pmc -- performance-monitoring counter interface for command execution SYNOPSIS
pmc -h pmc -C pmc -c event command [options ...] DESCRIPTION
pmc is a means of using a processor's performance-monitoring counter (PMC) facility to measure various aspects of a program's execution. It is meant to be used in a fashion similar to time(1). The arguments are as follows: -h Display a list of performance counter events available on the system. -C Cancel any performance counters that are currently running. -c event Count the event specified by event while running the command. DIAGNOSTICS
PMC support is not compiled into the kernel Performance-monitoring counter support has not been compiled into the kernel. It may be included using the PERFCTRS option. See options(4) for details. PMC counters are not supported by CPU Performance-monitoring counters are not available for the CPU. SEE ALSO
time(1), options(4) HISTORY
The pmc command first appeared in NetBSD 1.6. AUTHORS
The pmc command was written by Frank van der Linden <>. The kernel support for reading performance counters on the i386 architecture was written by Jason R. Thorpe <>. BUGS
The pmc command currently only supports performance-monitoring counters on the i386 architecture. BSD
October 24, 2000 BSD

Check Out this Related Man Page

PMC_ENABLE(3)						   BSD Library Functions Manual 					     PMC_ENABLE(3)

pmc_disable, pmc_enable -- administrative control of hardware performance counters LIBRARY
Performance Counters Library (libpmc, -lpmc) SYNOPSIS
#include <pmc.h> int pmc_disable(int cpu, int pmc); int pmc_enable(int cpu, int pmc); DESCRIPTION
These functions allow specific hardware performance monitoring counters in a system to be disabled and enabled administratively. The hard- ware performance counters available on each CPU are numbered using small non-negative integers, in a system dependent manner. Disabled coun- ters will not be available to applications for use. The invoking process needs to have the PRIV_PMC_MANAGE privilege to perform these operations. Function pmc_disable() disables the hardware counter numbered by argument pmc on CPU number cpu. Function pmc_enable() enables the hardware counter numbered by argument pmc on CPU number cpu. IMPLEMENTATION NOTES
Hardware PMCs that are currently in use by applications cannot be disabled. Allocation of a process scope software PMC marks all hardware PMCs in the system with the same pmc number as being in-use. RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
A call to these functions may fail with the following errors: [EBUSY] Function pmc_disable() specified a hardware PMC is currently in use. [EINVAL] Arguments cpu or pmc were invalid. [ENXIO] Argument cpu specified a disabled or absent CPU. [EPERM] The current process lacks sufficient privilege to perform this operation. SEE ALSO
pmc(3), pmc_cpuinfo(3), pmc_pmcinfo(3), hwpmc(4), pmccontrol(8), priv_check(9) BSD
September 22, 2008 BSD
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