void G1AdaptiveIHOPControl::send_trace_event(G1NewTracer* tracer) {
G1IHOPControl::send_trace_event(tracer);
tracer->report_adaptive_ihop_statistics(get_conc_mark_start_threshold(),
actual_target_threshold(),
G1CollectedHeap::heap()->used(),
_last_unrestrained_young_size,
_predictor->get_new_prediction(&_allocation_rate_s),
_predictor->get_new_prediction(&_marking_times_s),
have_enough_data_for_prediction());
}
void G1AdaptiveIHOPControl::print() {
G1IHOPControl::print();
size_t actual_target = actual_target_threshold();
log_debug(gc, ihop)("Adaptive IHOP information (value update), threshold: " SIZE_FORMAT "B (%1.2f), internal target occupancy: " SIZE_FORMAT "B,"
" predicted old gen allocation rate: %1.2f, predicted marking phase length: %1.2f, prediction active: %s",
get_conc_mark_start_threshold(),
percent_of(get_conc_mark_start_threshold(), actual_target),
actual_target,
_predictor->get_new_prediction(&_allocation_rate_s),
_predictor->get_new_prediction(&_marking_times_s),
have_enough_data_for_prediction() ? "true" : "false");
}
void G1AdaptiveIHOPControl::print() {
G1IHOPControl::print();
size_t actual_target = actual_target_threshold();
log_debug(gc, ihop)("Adaptive IHOP information (value update), threshold: " SIZE_FORMAT "B (%1.2f), internal target occupancy: " SIZE_FORMAT "B, "
"occupancy: " SIZE_FORMAT "B, additional buffer size: " SIZE_FORMAT "B, predicted old gen allocation rate: %1.2fB/s, "
"predicted marking phase length: %1.2fms, prediction active: %s",
get_conc_mark_start_threshold(),
percent_of(get_conc_mark_start_threshold(), actual_target),
actual_target,
G1CollectedHeap::heap()->used(),
_last_unrestrained_young_size,
_predictor->get_new_prediction(&_allocation_rate_s),
_predictor->get_new_prediction(&_marking_times_s) * 1000.0,
have_enough_data_for_prediction() ? "true" : "false");
}
size_t G1AdaptiveIHOPControl::get_conc_mark_start_threshold() {
if (have_enough_data_for_prediction()) {
double pred_marking_time = _predictor->get_new_prediction(&_marking_times_s);
double pred_promotion_rate = _predictor->get_new_prediction(&_allocation_rate_s);
size_t pred_promotion_size = (size_t)(pred_marking_time * pred_promotion_rate);
size_t predicted_needed_bytes_during_marking =
pred_promotion_size +
// In reality we would need the maximum size of the young gen during
// marking. This is a conservative estimate.
_last_unrestrained_young_size;
size_t internal_threshold = actual_target_threshold();
size_t predicted_initiating_threshold = predicted_needed_bytes_during_marking < internal_threshold ?
internal_threshold - predicted_needed_bytes_during_marking :
0;
return predicted_initiating_threshold;
} else {
// Use the initial value.
return (size_t)(_initial_ihop_percent * _target_occupancy / 100.0);
}
}
