/*
* Progress the event library and any functions that have registered to
* be called. We don't propogate errors from the progress functions,
* so no action is taken if they return failures. The functions are
* expected to return the number of events progressed, to determine
* whether or not we should call sched_yield() during MPI progress.
* This is only losely tracked, as an error return can cause the number
* of progressed events to appear lower than it actually is. We don't
* care, as the cost of that happening is far outweighed by the cost
* of the if checks (they were resulting in bad pipe stalling behavior)
*/
void
opal_progress(void)
{
size_t i;
int events = 0;
if( opal_progress_event_flag != 0 ) {
#if OPAL_HAVE_WORKING_EVENTOPS
#if OPAL_PROGRESS_USE_TIMERS
#if OPAL_TIMER_USEC_NATIVE
opal_timer_t now = opal_timer_base_get_usec();
#else
opal_timer_t now = opal_timer_base_get_cycles();
#endif /* OPAL_TIMER_USEC_NATIVE */
/* trip the event library if we've reached our tick rate and we are
enabled */
if (now - event_progress_last_time > event_progress_delta ) {
event_progress_last_time = (num_event_users > 0) ?
now - event_progress_delta : now;
events += opal_event_loop(opal_sync_event_base, opal_progress_event_flag);
}
#else /* OPAL_PROGRESS_USE_TIMERS */
/* trip the event library if we've reached our tick rate and we are
enabled */
if (OPAL_THREAD_ADD32(&event_progress_counter, -1) <= 0 ) {
event_progress_counter =
(num_event_users > 0) ? 0 : event_progress_delta;
events += opal_event_loop(opal_sync_event_base, opal_progress_event_flag);
}
#endif /* OPAL_PROGRESS_USE_TIMERS */
#endif /* OPAL_HAVE_WORKING_EVENTOPS */
}
/* progress all registered callbacks */
for (i = 0 ; i < callbacks_len ; ++i) {
events += (callbacks[i])();
}
#if OPAL_HAVE_SCHED_YIELD
if (opal_progress_yield_when_idle && events <= 0) {
/* If there is nothing to do - yield the processor - otherwise
* we could consume the processor for the entire time slice. If
* the processor is oversubscribed - this will result in a best-case
* latency equivalent to the time-slice.
*/
sched_yield();
}
#endif /* defined(HAVE_SCHED_YIELD) */
}
double MPI_Wtime(void)
{
double wtime;
#if OPAL_TIMER_CYCLE_NATIVE
wtime = ((double) opal_timer_base_get_cycles()) / opal_timer_base_get_freq();
#elif OPAL_TIMER_USEC_NATIVE
wtime = ((double) opal_timer_base_get_usec()) / 1000000.0;
#else
/* Fall back to gettimeofday() if we have nothing else */
struct timeval tv;
gettimeofday(&tv, NULL);
wtime = tv.tv_sec;
wtime += (double)tv.tv_usec / 1000000.0;
#endif
OPAL_CR_NOOP_PROGRESS();
return wtime;
}
void
opal_progress_set_event_poll_rate(int polltime)
{
OPAL_OUTPUT((debug_output, "progress: progress_set_event_poll_rate(%d)", polltime));
#if OPAL_PROGRESS_USE_TIMERS
event_progress_delta = 0;
# if OPAL_TIMER_USEC_NATIVE
event_progress_last_time = opal_timer_base_get_usec();
# else
event_progress_last_time = opal_timer_base_get_cycles();
# endif
#else
event_progress_counter = event_progress_delta = 0;
#endif
if (polltime == 0) {
#if OPAL_PROGRESS_USE_TIMERS
/* user specified as never tick - tick once per minute */
event_progress_delta = 60 * 1000000;
#else
/* user specified as never tick - don't count often */
event_progress_delta = INT_MAX;
#endif
} else {
#if OPAL_PROGRESS_USE_TIMERS
event_progress_delta = polltime;
#else
/* subtract one so that we can do post-fix subtraction
in the inner loop and go faster */
event_progress_delta = polltime - 1;
#endif
}
#if OPAL_PROGRESS_USE_TIMERS && !OPAL_TIMER_USEC_NATIVE
/* going to use cycles for counter. Adjust specified usec into cycles */
event_progress_delta = event_progress_delta * opal_timer_base_get_freq() / 1000000;
#endif
}
double MPI_Wtime(void)
{
double wtime;
/*
* See https://github.com/open-mpi/ompi/issues/3003 to find out
* what's happening here.
*/
#if 0
#if OPAL_TIMER_CYCLE_NATIVE
wtime = ((double) opal_timer_base_get_cycles()) / opal_timer_base_get_freq();
#elif OPAL_TIMER_USEC_NATIVE
wtime = ((double) opal_timer_base_get_usec()) / 1000000.0;
#endif
#else
#if defined(__linux__) && OPAL_HAVE_CLOCK_GETTIME
struct timespec tp;
(void) clock_gettime(CLOCK_MONOTONIC, &tp);
if( OPAL_UNLIKELY(0 == ompi_wtime_time_origin.tv_sec) ) {
ompi_wtime_time_origin = tp;
}
wtime = (double)(tp.tv_nsec - ompi_wtime_time_origin.tv_nsec)/1.0e+9;
wtime += (tp.tv_sec - ompi_wtime_time_origin.tv_sec);
#else
/* Fall back to gettimeofday() if we have nothing else */
struct timeval tv;
gettimeofday(&tv, NULL);
if( OPAL_UNLIKELY(0 == ompi_wtime_time_origin.tv_sec) ) {
ompi_wtime_time_origin = tv;
}
wtime = (double)(tv.tv_usec - ompi_wtime_time_origin.tv_usec) / 1.0e+6;
wtime += (tv.tv_sec - ompi_wtime_time_origin.tv_sec);
#endif
#endif
OPAL_CR_NOOP_PROGRESS();
return wtime;
}
static int opal_progress_events(void)
{
static opal_atomic_int32_t lock = 0;
int events = 0;
if( opal_progress_event_flag != 0 && !OPAL_THREAD_SWAP_32(&lock, 1) ) {
#if OPAL_HAVE_WORKING_EVENTOPS
#if OPAL_PROGRESS_USE_TIMERS
#if OPAL_PROGRESS_ONLY_USEC_NATIVE
opal_timer_t now = opal_timer_base_get_usec();
#else
opal_timer_t now = opal_timer_base_get_cycles();
#endif /* OPAL_PROGRESS_ONLY_USEC_NATIVE */
/* trip the event library if we've reached our tick rate and we are
enabled */
if (now - event_progress_last_time > event_progress_delta ) {
event_progress_last_time = (num_event_users > 0) ?
now - event_progress_delta : now;
events += opal_event_loop(opal_sync_event_base, opal_progress_event_flag);
}
#else /* OPAL_PROGRESS_USE_TIMERS */
/* trip the event library if we've reached our tick rate and we are
enabled */
if (OPAL_THREAD_ADD_FETCH32(&event_progress_counter, -1) <= 0 ) {
event_progress_counter =
(num_event_users > 0) ? 0 : event_progress_delta;
events += opal_event_loop(opal_sync_event_base, opal_progress_event_flag);
}
#endif /* OPAL_PROGRESS_USE_TIMERS */
#endif /* OPAL_HAVE_WORKING_EVENTOPS */
lock = 0;
}
return events;
}
double MPI_Wtime(void)
{
double wtime;
#if OPAL_TIMER_USEC_NATIVE
/* We may or may not have native usec precision on Windows, so put
this #if before the #ifdef checking for Windows. */
wtime = ((double) opal_timer_base_get_usec()) / 1000000.0;
#elif defined(__WINDOWS__)
wtime = ((double) opal_timer_base_get_cycles()) /
((double) opal_timer_base_get_freq());
#else
/* Fall back to gettimeofday() if we have nothing else */
struct timeval tv;
gettimeofday(&tv, NULL);
wtime = tv.tv_sec;
wtime += (double)tv.tv_usec / 1000000.0;
#endif
OPAL_CR_NOOP_PROGRESS();
return wtime;
}
/* init the progress engine - called from orte_init */
int
opal_progress_init(void)
{
/* reentrant issues */
#if OMPI_HAVE_THREAD_SUPPORT
opal_atomic_init(&progress_lock, OPAL_ATOMIC_UNLOCKED);
#endif /* OMPI_HAVE_THREAD_SUPPORT */
/* always call sched yield when in the rte only... */
call_yield = 1;
#if OPAL_PROGRESS_USE_TIMERS
event_progress_delta = 0;
#if OPAL_TIMER_USEC_NATIVE
event_progress_last_time = opal_timer_base_get_usec();
#else
event_progress_last_time = opal_timer_base_get_cycles();
#endif
#else
event_progress_counter = event_progress_delta = 0;
#endif
return OPAL_SUCCESS;
}
/*
* Progress the event library and any functions that have registered to
* be called. We don't propogate errors from the progress functions,
* so no action is taken if they return failures. The functions are
* expected to return the number of events progressed, to determine
* whether or not we should call sched_yield() during MPI progress.
* This is only losely tracked, as an error return can cause the number
* of progressed events to appear lower than it actually is. We don't
* care, as the cost of that happening is far outweighed by the cost
* of the if checks (they were resulting in bad pipe stalling behavior)
*/
void
opal_progress(void)
{
size_t i;
int events = 0;
#if OPAL_HAVE_THREAD_SUPPORT
opal_atomic_add(&opal_progress_recursion_depth_counter, 1);
#else
++opal_progress_recursion_depth_counter;
#endif
if( opal_progress_event_flag != 0 ) {
#if (OPAL_ENABLE_PROGRESS_THREADS == 0) && OPAL_HAVE_WORKING_EVENTOPS
#if OPAL_PROGRESS_USE_TIMERS
#if OPAL_TIMER_USEC_NATIVE
opal_timer_t now = opal_timer_base_get_usec();
#else
opal_timer_t now = opal_timer_base_get_cycles();
#endif /* OPAL_TIMER_USEC_NATIVE */
/* trip the event library if we've reached our tick rate and we are
enabled */
if (now - event_progress_last_time > event_progress_delta ) {
event_progress_last_time = (num_event_users > 0) ?
now - event_progress_delta : now;
events += opal_event_loop(opal_progress_event_flag);
}
#else /* OPAL_PROGRESS_USE_TIMERS */
/* trip the event library if we've reached our tick rate and we are
enabled */
if (OPAL_THREAD_ADD32(&event_progress_counter, -1) <= 0 ) {
event_progress_counter =
(num_event_users > 0) ? 0 : event_progress_delta;
events += opal_event_loop(opal_progress_event_flag);
}
#endif /* OPAL_PROGRESS_USE_TIMERS */
#endif /* OPAL_ENABLE_PROGRESS_THREADS == 0 && OPAL_HAVE_WORKING_EVENTOPS */
}
/* progress all registered callbacks */
for (i = 0 ; i < callbacks_len ; ++i) {
events += (callbacks[i])();
}
#if defined(__WINDOWS__) || defined(HAVE_SCHED_YIELD)
if (call_yield && events <= 0) {
/* If there is nothing to do - yield the processor - otherwise
* we could consume the processor for the entire time slice. If
* the processor is oversubscribed - this will result in a best-case
* latency equivalent to the time-slice.
*/
#if defined(__WINDOWS__)
SwitchToThread();
#else
sched_yield();
#endif /* defined(__WINDOWS__) */
}
#endif /* defined(__WINDOWS__) || defined(HAVE_SCHED_YIELD) */
#if OPAL_HAVE_THREAD_SUPPORT
opal_atomic_add(&opal_progress_recursion_depth_counter, -1);
#else
--opal_progress_recursion_depth_counter;
#endif
}
/* turn on MPI optimizations */
int
opal_progress_mpi_enable(void)
{
int param, value;
/* call sched yield when oversubscribed. */
param = mca_base_param_find("mpi", NULL, "yield_when_idle");
mca_base_param_lookup_int(param, &value);
if (value < 0) {
/* this should never happen set to 1 if it somehow does */
call_yield = 1;
} else {
call_yield = value;
}
/* set the event tick rate */
param = mca_base_param_find("mpi", NULL, "event_tick_rate");
mca_base_param_lookup_int(param, &value);
if (value < 0) {
/* user didn't specify - default tick rate */
event_progress_delta = opal_progress_default_tick_rate;
} else if (value == 0) {
#if OPAL_PROGRESS_USE_TIMERS
/* user specified as never tick - tick once per minute */
event_progress_delta = 60 * 1000000;
#else
/* user specified as never tick - don't count often */
event_progress_delta = INT_MAX;
#endif
} else {
#if OPAL_PROGRESS_USE_TIMERS
event_progress_delta = value;
#else
/* subtract one so that we can do post-fix subtraction
in the inner loop and go faster */
event_progress_delta = value - 1;
#endif
}
#if OPAL_PROGRESS_USE_TIMERS && !OPAL_TIMER_USEC_NATIVE
/* going to use cycles for counter. Adjust specified usec into cycles */
event_progress_delta = event_progress_delta * opal_timer_base_get_freq() / 1000000;
#endif
#if OPAL_PROGRESS_USE_TIMERS
#if OPAL_TIMER_USEC_NATIVE
event_progress_last_time = opal_timer_base_get_usec();
#else
event_progress_last_time = opal_timer_base_get_cycles();
#endif
#else
/* it's possible that an init function bumped up our tick rate.
* If so, set the event_progress counter to 0. Otherwise, set it to
* the reset value */
event_progress_counter = (event_num_mpi_users > 0) ?
0 : event_progress_delta;
#endif
return OPAL_SUCCESS;
}
