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Man Pages


Manual Reference Pages  -  PMC.TSC (3)

NAME

pmc.tsc - measurements using the i386 timestamp counter

CONTENTS

Library
Synopsis
Description
     Event Name Aliases
See Also
History
Authors

LIBRARY


.Lb libpmc

SYNOPSIS


.In pmc.h

DESCRIPTION

In the i386 architecture, the timestamp counter is a monotonically non-decreasing counter that counts processor cycles.

This counter may be selected specifying an event specifier "tsc" to pmc_allocate(3). The TSC is a read-only counter that may only be allocated in system-wide counting mode. The "tsc" event does not support further event qualifiers.

Multiple processes are allowed to allocate the TSC. Once allocated, the TSC may be read using the pmc_read function, or by using the RDTSC instruction.

    Event Name Aliases

The alias "cycles" maps to the TSC.

SEE ALSO

pmc(3), pmc.atom(3), pmc.core(3), pmc.core2(3), pmc.iaf(3), pmc.k7(3), pmc.k8(3), pmc.p4(3), pmc.p5(3), pmc.p6(3), pmc.soft(3), pmclog(3), hwpmc(4)

HISTORY

The pmc library first appeared in
.Fx 6.0 .

AUTHORS

The
.Lb libpmc library was written by
.An Joseph Koshy <jkoshy@FreeBSD.org>.
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