Which system is faster? Post: 302793809

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LEARN ABOUT FREEBSD

pmc.iaf

PMC.IAF(3)						   BSD Library Functions Manual 						PMC.IAF(3)

NAME

     pmc.iaf -- measurement events for Intel fixed function performance counters.

LIBRARY

     Performance Counters Library (libpmc, -lpmc)

SYNOPSIS

     #include <pmc.h>

DESCRIPTION

     Intel fixed-function PMCs are present in CPUs that conform to version 2 or later of the Intel Performance Measurement Architecture.  Each
     fixed-function PMC measures a specific hardware event.  The number of fixed-function PMCs implemented in a CPU can vary.  The number of
     fixed-function PMCs present can be determined at runtime by using function pmc_cpuinfo(3).

     Intel fixed-function PMCs are documented in "Volume 3: System Programming Guide", IA-32 Intel(R) Architecture Software Developer's Manual,
     Order Number 253669-027US, Intel Corporation, July 2008.

   PMC Capabilities
     Fixed-function PMCs support the following capabilities:

     Capability 	  Support
     PMC_CAP_CASCADE	  No
     PMC_CAP_EDGE	  No
     PMC_CAP_INTERRUPT	  Yes
     PMC_CAP_INVERT	  No
     PMC_CAP_READ	  Yes
     PMC_CAP_PRECISE	  No
     PMC_CAP_SYSTEM	  Yes
     PMC_CAP_TAGGING	  No
     PMC_CAP_THRESHOLD	  No
     PMC_CAP_USER	  Yes
     PMC_CAP_WRITE	  Yes

   Class Name Prefix
     These PMCs are named using a class name prefix of ``iaf-''.

   Event Qualifiers (Fixed Function PMCs)
     These PMCs support the following modifiers:

     os      Configure the PMC to count events occurring at ring level 0.

     usr     Configure the PMC to count events occurring at ring levels 1, 2 or 3.

     anythread
	     (Atom CPUs) Configure the PMC to count events on all logical processors sharing a processor core.	The default is to count events on
	     the current logical processor.

     If neither of the ``os'' or ``usr'' qualifiers are specified, the default is to enable both.

   Event Specifiers (Fixed Function PMCs)
     The fixed function PMCs are selectable using the following event names:

     INSTR_RETIRED.ANY
	     (Fixed Function Counter 0) The number of instructions retired.

     CPU_CLK_UNHALTED.CORE
	     (Fixed Function Counter 1) The number of core cycles for which the core is not halted.

     CPU_CLK_UNHALTED.REF
	     (Fixed Function Counter 2) The number of reference cycles for which the core is not halted.

EXAMPLES

     To measure the number of core cycles for which the core was not halted use the event specifier "iaf-cpu-clk-unhalted.core".

     To measure the number of user instructions retired use the event specifier "iaf-instr-retired.any,usr".

     To measure the number of user instructions retired on all logical processors in an Atom CPU, use the event specifier
     "iaf-instr-retired.any,usr,anythread".

SEE ALSO

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

HISTORY

     The pmc library first appeared in FreeBSD 6.0.

AUTHORS

     The Performance Counters Library (libpmc, -lpmc) library was written by Joseph Koshy <jkoshy@FreeBSD.org>.

BSD
								 November 14, 2008							       BSD