pmc(1) [netbsd man page]

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

NAME

     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 <fvdl@wasabisystems.com>.  The kernel support for reading performance counters on the
     i386 architecture was written by
     Jason R. Thorpe <thorpej@zembu.com>.

BUGS

     The pmc command currently only supports performance-monitoring counters on the i386 architecture.

BSD
								 October 24, 2000							       BSD

PMC_READ(3)						   BSD Library Functions Manual 					       PMC_READ(3)

NAME

     pmc_read, pmc_rw, pmc_write, -- read and write hardware performance counters

LIBRARY

     Performance Counters Library (libpmc, -lpmc)

SYNOPSIS

     #include <pmc.h>

     int
     pmc_read(pmc_id_t pmc, pmc_value_t *value);

     int
     pmc_rw(pmc_id_t pmc, pmc_value_t newvalue, pmc_value_t *oldvaluep);

     int
     pmc_write(pmc_id_t pmc, pmc_value_t value);

DESCRIPTION

     These functions read and write the current value of a PMC.

     Function pmc_read() will read the current value of the PMC specified by argument pmc and write it to the location specified by argument
     value.

     Function pmc_write() will set the current value of the PMC specified by argument pmc to the value specified by argument value.

     Function pmc_rw() combines a read and a write into a single atomic operation.

     For write operations the PMC should be a quiescent state.

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]		A write operation specified a currently running PMC.

     [EINVAL]		Argument pmc specified a PMC not in a readable state.

     [EINVAL]		The PMC specified by argument pmc was not owned by the current process.

SEE ALSO

     pmc(3), hwpmc(4)

BSD
								 November 25, 2007							       BSD