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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team 2005
*
* Machine-dependent time measurement functions
*
* ---------------------------------------------------------------------------*/
// Not POSIX, due to use of ru_majflt in getPageFaults()
// #include "PosixSource.h"
#include "Rts.h"
#include "GetTime.h"
#include "Clock.h"
#if HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
#endif
#ifdef HAVE_SYS_TIMES_H
# include <sys/times.h>
#endif
#ifdef USE_PAPI
# include <papi.h>
#endif
#if ! ((defined(HAVE_GETRUSAGE) && !irix_HOST_OS) || defined(HAVE_TIMES))
#error No implementation for getProcessCPUTime() available.
#endif
#if defined(HAVE_GETTIMEOFDAY) && defined(HAVE_GETRUSAGE) && !irix_HOST_OS
// we'll implement getProcessCPUTime() and getProcessElapsedTime()
// separately, using getrusage() and gettimeofday() respectively
#ifdef darwin_HOST_OS
static uint64_t timer_scaling_factor_numer = 0;
static uint64_t timer_scaling_factor_denom = 0;
#endif
void initializeTimer()
{
#ifdef darwin_HOST_OS
mach_timebase_info_data_t info;
(void) mach_timebase_info(&info);
timer_scaling_factor_numer = (uint64_t)info.numer;
timer_scaling_factor_denom = (uint64_t)info.denom;
#endif
}
Time getProcessCPUTime(void)
{
#if !defined(BE_CONSERVATIVE) && \
defined(HAVE_CLOCK_GETTIME) && \
defined(_SC_CPUTIME) && \
defined(CLOCK_PROCESS_CPUTIME_ID) && \
defined(HAVE_SYSCONF)
static int checked_sysconf = 0;
static int sysconf_result = 0;
if (!checked_sysconf) {
sysconf_result = sysconf(_SC_CPUTIME);
checked_sysconf = 1;
}
if (sysconf_result != -1) {
struct timespec ts;
int res;
res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
if (res == 0) {
return SecondsToTime(ts.tv_sec) + NSToTime(ts.tv_nsec);
} else {
sysErrorBelch("clock_gettime");
stg_exit(EXIT_FAILURE);
}
}
#endif
// fallback to getrusage
{
struct rusage t;
getrusage(RUSAGE_SELF, &t);
return SecondsToTime(t.ru_utime.tv_sec) + USToTime(t.ru_utime.tv_usec);
}
}
StgWord64 getMonotonicNSec(void)
{
#if defined(HAVE_CLOCK_GETTIME)
struct timespec ts;
int res;
res = clock_gettime(CLOCK_ID, &ts);
if (res != 0) {
sysErrorBelch("clock_gettime");
stg_exit(EXIT_FAILURE);
}
return (StgWord64)ts.tv_sec * 1000000000 +
(StgWord64)ts.tv_nsec;
#elif defined(darwin_HOST_OS)
uint64_t time = mach_absolute_time();
return (time * timer_scaling_factor_numer) / timer_scaling_factor_denom;
#else // use gettimeofday()
struct timeval tv;
gettimeofday(&tv, (struct timezone *) NULL);
return (StgWord64)tv.tv_sec * 1000000000 +
(StgWord64)tv.tv_usec * 1000;
#endif
}
Time getProcessElapsedTime(void)
{
return NSToTime(getMonotonicNSec());
}
void getProcessTimes(Time *user, Time *elapsed)
{
*user = getProcessCPUTime();
*elapsed = getProcessElapsedTime();
}
#elif defined(HAVE_TIMES)
// we'll use the old times() API.
Time getProcessCPUTime(void)
{
#if !defined(THREADED_RTS) && USE_PAPI
long long usec;
if ((usec = PAPI_get_virt_usec()) < 0) {
barf("PAPI_get_virt_usec: %lld", usec);
}
return USToTime(usec);
#else
Time user, elapsed;
getProcessTimes(&user,&elapsed);
return user;
#endif
}
Time getProcessElapsedTime(void)
{
Time user, elapsed;
getProcessTimes(&user,&elapsed);
return elapsed;
}
void getProcessTimes(Time *user, Time *elapsed)
{
static nat ClockFreq = 0;
if (ClockFreq == 0) {
#if defined(HAVE_SYSCONF)
long ticks;
ticks = sysconf(_SC_CLK_TCK);
if ( ticks == -1 ) {
sysErrorBelch("sysconf");
stg_exit(EXIT_FAILURE);
}
ClockFreq = ticks;
#elif defined(CLK_TCK) /* defined by POSIX */
ClockFreq = CLK_TCK;
#elif defined(HZ)
ClockFreq = HZ;
#elif defined(CLOCKS_PER_SEC)
ClockFreq = CLOCKS_PER_SEC;
#else
errorBelch("can't get clock resolution");
stg_exit(EXIT_FAILURE);
#endif
}
struct tms t;
clock_t r = times(&t);
*user = SecondsToTime(t.tms_utime) / ClockFreq;
*elapsed = SecondsToTime(r) / ClockFreq;
}
#endif // HAVE_TIMES
Time getThreadCPUTime(void)
{
#if USE_PAPI
long long usec;
if ((usec = PAPI_get_virt_usec()) < 0) {
barf("PAPI_get_virt_usec: %lld", usec);
}
return USToTime(usec);
#elif !defined(BE_CONSERVATIVE) && \
defined(HAVE_CLOCK_GETTIME) && \
defined(_SC_CPUTIME) && \
defined(CLOCK_PROCESS_CPUTIME_ID) && \
defined(HAVE_SYSCONF)
{
static int checked_sysconf = 0;
static int sysconf_result = 0;
if (!checked_sysconf) {
sysconf_result = sysconf(_SC_THREAD_CPUTIME);
checked_sysconf = 1;
}
if (sysconf_result != -1) {
// clock_gettime() gives us per-thread CPU time. It isn't
// reliable on Linux, but it's the best we have.
struct timespec ts;
int res;
res = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
if (res == 0) {
return SecondsToTime(ts.tv_sec) + NSToTime(ts.tv_nsec);
}
}
}
#endif
return getProcessCPUTime();
}
void getUnixEpochTime(StgWord64 *sec, StgWord32 *nsec)
{
#if defined(HAVE_GETTIMEOFDAY)
struct timeval tv;
gettimeofday(&tv, (struct timezone *) NULL);
*sec = tv.tv_sec;
*nsec = tv.tv_usec * 1000;
#else
/* Sigh, fall back to second resolution. */
time_t t;
time(&t);
*sec = t;
*nsec = 0;
#endif
}
W_
getPageFaults(void)
{
#if !defined(HAVE_GETRUSAGE) || irix_HOST_OS || haiku_HOST_OS
return 0;
#else
struct rusage t;
getrusage(RUSAGE_SELF, &t);
return(t.ru_majflt);
#endif
}
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