11-19-2009
Quote:
Originally Posted by
pludi
The first computer I owned was an Intel Pentium at 90 Mhz (with F0 0F bug).
I was running an ad hoc web site for the Linux Benchmarks at that time and recall the 486 to Pentium transition
That is really cool that the first computer you owned was a Pentium. What a way to start !
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LEARN ABOUT SUNOS
cpc_event
cpc_event(3CPC) CPU Performance Counters Library Functions cpc_event(3CPC)
NAME
cpc_event - data structure to describe CPU performance counters
SYNOPSIS
#include <libcpc.h>
DESCRIPTION
The libcpc interfaces manipulate CPU performance counters using the cpc_event_t data structure. This structure contains several fields that
are common to all processors, and some that are processor-dependent. These structures can be declared by a consumer of the API, thus the
size and offsets of the fields and the entire data structure are fixed per processor for any particular version of the library. See
cpc_version(3CPC) for details of library versioning.
SPARC
For UltraSPARC, the structure contains the following members:
typedef struct {
int ce_cpuver;
hrtime_t ce_hrt;
uint64_t ce_tick;
uint64_t ce_pic[2];
uint64_t ce_pcr;
} cpc_event_t;
x86
For Pentium, the structure contains the following members:
typedef struct {
int ce_cpuver;
hrtime_t ce_hrt;
uint64_t ce_tsc;
uint64_t ce_pic[2];
uint32_t ce_pes[2];
#define ce_cesr ce_pes[0]
} cpc_event_t;
The APIs are used to manipulate the highly processor-dependent control registers (the ce_pcr, ce_cesr, and ce_pes fields); the programmer
is strongly advised not to reference those fields directly in portable code. The ce_pic array elements contain 64-bit accumulated counter
values. The hardware registers are virtualized to 64-bit quantities even though the underlying hardware only supports 32-bits (UltraSPARC)
or 40-bits (Pentium) before overflow.
The ce_hrt field is a high resolution timestamp taken at the time the counters were sampled by the kernel. This uses the same timebase as
gethrtime(3C).
On SPARC V9 machines, the number of cycles spent running on the processor is computed from samples of the processor-dependent %tick regis-
ter, and placed in the ce_tick field. On Pentium processors, the processor-dependent time-stamp counter register is similarly sampled and
placed in the ce_tsc field.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
SEE ALSO
gethrtime(3C), cpc(3CPC), cpc_version(3CPC), libcpc(3LIB), attributes(5)
SunOS 5.10 12 May 2003 cpc_event(3CPC)