PMC.TSC(3) BSD Library Functions Manual PMC.TSC(3)NAMEpmc.tsc — measurements using the i386 timestamp counter
Performance Counters Library (libpmc, -lpmc)
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 allo‐
cated 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
Event Name Aliases
The alias “cycles” maps to the TSC.
SEE ALSOpmc(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), pmclog(3), hwpmc(4)HISTORY
The pmc library first appeared in FreeBSD 6.0.
The Performance Counters Library (libpmc, -lpmc) library was written by
Joseph Koshy ⟨jkoshy@FreeBSD.org⟩.
BSD October 4, 2008 BSD