96 строки
3.1 KiB
C
96 строки
3.1 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2004-2005 The Trustees of Indiana University.
|
||
|
|
* All rights reserved.
|
||
|
|
* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
|
||
|
|
* All rights reserved.
|
||
|
|
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
|
||
|
|
* University of Stuttgart. All rights reserved.
|
||
|
|
* Copyright (c) 2004-2005 The Regents of the University of California.
|
||
|
|
* All rights reserved.
|
||
|
|
* $COPYRIGHT$
|
||
|
|
*
|
||
|
|
* Additional copyrights may follow
|
||
|
|
*
|
||
|
|
* $HEADER$
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @file
|
||
|
|
*
|
||
|
|
* High resolution timer / cycle counter
|
||
|
|
*
|
||
|
|
* High resolution timer / cycle counter interface. This interface is
|
||
|
|
* intended to hide the system-dependent nature of timers that provide
|
||
|
|
* higher resolution and lower calling cost than gettimeofday().
|
||
|
|
* Unlike most component interfaces, there should only ever be one
|
||
|
|
* component available to be built on a particular platform.
|
||
|
|
* Therefore, a number of #defines are available to determine how well
|
||
|
|
* the platform supports high resolution timers:
|
||
|
|
*
|
||
|
|
* <UL>
|
||
|
|
* <LI><PRE>OPAL_TIMER_CYCLE_NATIVE</PRE> Whether
|
||
|
|
* opal_timer_base_get_cycle() is implemented directly or computed
|
||
|
|
* from some other data (such as a high res timer)</LI>
|
||
|
|
* <LI><PRE>OPAL_TIMER_CYCLE_SUPPORTED</PRE> Whether
|
||
|
|
* opal_timer_base_get_cycle() is supported on the current
|
||
|
|
* platform.</LI>
|
||
|
|
* <LI><PRE>OPAL_TIMER_USEC_SUPPORTED</PRE> Whether
|
||
|
|
* opal_timer_base_get_usec() is supported on the current
|
||
|
|
* platform or implemented on top of gettimeofday(), which
|
||
|
|
* may be unsuitable for some uses.
|
||
|
|
* </UL>
|
||
|
|
*
|
||
|
|
* The cycle count may not be the cycle count of the CPU itself, if
|
||
|
|
* there is another sufficiently close counter with better behavior
|
||
|
|
* characteristics (like the Time Base counter on many Power/PowerPC
|
||
|
|
* platforms). The function opal_timer_base_get_freq() returns the
|
||
|
|
* frequency of the cycle counter in use, *NOT* the frequency of the
|
||
|
|
* main CPU.
|
||
|
|
*
|
||
|
|
* Unless otherwise noted, no attempt is made to cope with the the
|
||
|
|
* differences in counters on SMP machines. If your process switches
|
||
|
|
* CPUs, your timer results may change.
|
||
|
|
*
|
||
|
|
* Build time priorities are allocated as follows:
|
||
|
|
*
|
||
|
|
* - 0 gettimeofday() wrapper
|
||
|
|
* - 10 Assembly timers with bad frequency search (Linux)
|
||
|
|
* - 20 NIC software stack (QSNet, Myrinet?)
|
||
|
|
* - 30 Operating systems with native interfaces
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef OPAL_MCA_TIMER_TIMER_H
|
||
|
|
#define OPAL_MCA_TIMER_TIMER_H
|
||
|
|
|
||
|
|
#include "ompi_config.h"
|
||
|
|
|
||
|
|
#include "mca/mca.h"
|
||
|
|
#include "mca/base/base.h"
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Structure for timer v1.0.0 components.
|
||
|
|
* Chained to MCA v1.0.0
|
||
|
|
*/
|
||
|
|
struct opal_timer_base_component_1_0_0_t {
|
||
|
|
/** MCA base component */
|
||
|
|
mca_base_component_t timerc_version;
|
||
|
|
/** MCA base data */
|
||
|
|
mca_base_component_data_1_0_0_t timerc_data;
|
||
|
|
};
|
||
|
|
/**
|
||
|
|
* Convenience typedef
|
||
|
|
*/
|
||
|
|
typedef struct opal_timer_base_component_1_0_0_t opal_timer_base_component_1_0_0_t;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Macro for use in components that are of type timer v1.0.0
|
||
|
|
*/
|
||
|
|
#define OPAL_TIMER_BASE_VERSION_1_0_0 \
|
||
|
|
/* timer v1.0 is chained to MCA v1.0 */ \
|
||
|
|
MCA_BASE_VERSION_1_0_0, \
|
||
|
|
/* timer v1.0 */ \
|
||
|
|
"timer", 1, 0, 0
|
||
|
|
|
||
|
|
#endif /* OPAL_MCA_TIMER_TIMER_H */
|