hotspot/src/share/vm/gc/g1/g1Analytics.cpp
author jwilhelm
Fri, 19 Aug 2016 17:19:47 +0200
changeset 40523 20873f6704de
parent 40328 a2851f5f1cf6
permissions -rw-r--r--
8164124: [BACKOUT] G1 does not implement millis_since_last_gc which is needed by RMI GC Reviewed-by: jprovino
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/*
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 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "gc/g1/g1Analytics.hpp"
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#include "gc/g1/g1Predictions.hpp"
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#include "runtime/os.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/numberSeq.hpp"
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// Different defaults for different number of GC threads
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// They were chosen by running GCOld and SPECjbb on debris with different
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//   numbers of GC threads and choosing them based on the results
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// all the same
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static double rs_length_diff_defaults[] = {
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  0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0
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};
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static double cost_per_card_ms_defaults[] = {
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  0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015
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};
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// all the same
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static double young_cards_per_entry_ratio_defaults[] = {
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  1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0
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};
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static double cost_per_entry_ms_defaults[] = {
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  0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005
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};
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static double cost_per_byte_ms_defaults[] = {
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  0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009
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};
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// these should be pretty consistent
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static double constant_other_time_ms_defaults[] = {
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  5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0
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};
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static double young_other_cost_per_region_ms_defaults[] = {
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  0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1
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};
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static double non_young_other_cost_per_region_ms_defaults[] = {
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  1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30
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};
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G1Analytics::G1Analytics(const G1Predictions* predictor) :
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    _predictor(predictor),
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    _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)),
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    _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)),
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    _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)),
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    _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _prev_collection_pause_end_ms(0.0),
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    _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _cost_scan_hcc_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _mixed_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _non_young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)),
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    _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)) {
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  // Seed sequences with initial values.
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  _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime());
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  _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0;
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  int index = MIN2(ParallelGCThreads - 1, 7u);
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  _rs_length_diff_seq->add(rs_length_diff_defaults[index]);
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  _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]);
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  _cost_scan_hcc_seq->add(0.0);
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  _young_cards_per_entry_ratio_seq->add(young_cards_per_entry_ratio_defaults[index]);
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  _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]);
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  _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]);
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  _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]);
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  _young_other_cost_per_region_ms_seq->add(young_other_cost_per_region_ms_defaults[index]);
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  _non_young_other_cost_per_region_ms_seq->add(non_young_other_cost_per_region_ms_defaults[index]);
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  // start conservatively (around 50ms is about right)
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  _concurrent_mark_remark_times_ms->add(0.05);
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  _concurrent_mark_cleanup_times_ms->add(0.20);
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}
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double G1Analytics::get_new_prediction(TruncatedSeq const* seq) const {
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  return _predictor->get_new_prediction(seq);
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}
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size_t G1Analytics::get_new_size_prediction(TruncatedSeq const* seq) const {
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  return (size_t)get_new_prediction(seq);
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}
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int G1Analytics::num_alloc_rate_ms() const {
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  return _alloc_rate_ms_seq->num();
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}
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void G1Analytics::report_concurrent_mark_remark_times_ms(double ms) {
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  _concurrent_mark_remark_times_ms->add(ms);
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}
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void G1Analytics::report_alloc_rate_ms(double alloc_rate) {
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  _alloc_rate_ms_seq->add(alloc_rate);
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}
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void G1Analytics::compute_pause_time_ratio(double interval_ms, double pause_time_ms) {
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  _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum() / interval_ms;
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  if (_recent_avg_pause_time_ratio < 0.0 ||
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      (_recent_avg_pause_time_ratio - 1.0 > 0.0)) {
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    // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in
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    // CR 6902692 by redoing the manner in which the ratio is incrementally computed.
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    if (_recent_avg_pause_time_ratio < 0.0) {
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      _recent_avg_pause_time_ratio = 0.0;
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    } else {
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      assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant");
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      _recent_avg_pause_time_ratio = 1.0;
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    }
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  }
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  // Compute the ratio of just this last pause time to the entire time range stored
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  // in the vectors. Comparing this pause to the entire range, rather than only the
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  // most recent interval, has the effect of smoothing over a possible transient 'burst'
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  // of more frequent pauses that don't really reflect a change in heap occupancy.
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  // This reduces the likelihood of a needless heap expansion being triggered.
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  _last_pause_time_ratio =
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    (pause_time_ms * _recent_prev_end_times_for_all_gcs_sec->num()) / interval_ms;
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}
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void G1Analytics::report_cost_per_card_ms(double cost_per_card_ms) {
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  _cost_per_card_ms_seq->add(cost_per_card_ms);
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}
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void G1Analytics::report_cost_scan_hcc(double cost_scan_hcc) {
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  _cost_scan_hcc_seq->add(cost_scan_hcc);
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}
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void G1Analytics::report_cost_per_entry_ms(double cost_per_entry_ms, bool last_gc_was_young) {
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  if (last_gc_was_young) {
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    _cost_per_entry_ms_seq->add(cost_per_entry_ms);
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  } else {
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    _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms);
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  }
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}
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void G1Analytics::report_cards_per_entry_ratio(double cards_per_entry_ratio, bool last_gc_was_young) {
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  if (last_gc_was_young) {
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    _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio);
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  } else {
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    _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio);
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  }
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}
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void G1Analytics::report_rs_length_diff(double rs_length_diff) {
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  _rs_length_diff_seq->add(rs_length_diff);
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}
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void G1Analytics::report_cost_per_byte_ms(double cost_per_byte_ms, bool in_marking_window) {
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  if (in_marking_window) {
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    _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms);
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  } else {
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    _cost_per_byte_ms_seq->add(cost_per_byte_ms);
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  }
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}
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void G1Analytics::report_young_other_cost_per_region_ms(double other_cost_per_region_ms) {
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  _young_other_cost_per_region_ms_seq->add(other_cost_per_region_ms);
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}
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void G1Analytics::report_non_young_other_cost_per_region_ms(double other_cost_per_region_ms) {
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  _non_young_other_cost_per_region_ms_seq->add(other_cost_per_region_ms);
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}
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void G1Analytics::report_constant_other_time_ms(double constant_other_time_ms) {
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  _constant_other_time_ms_seq->add(constant_other_time_ms);
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}
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void G1Analytics::report_pending_cards(double pending_cards) {
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  _pending_cards_seq->add(pending_cards);
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}
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void G1Analytics::report_rs_lengths(double rs_lengths) {
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  _rs_lengths_seq->add(rs_lengths);
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}
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size_t G1Analytics::predict_rs_length_diff() const {
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  return get_new_size_prediction(_rs_length_diff_seq);
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}
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double G1Analytics::predict_alloc_rate_ms() const {
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  return get_new_prediction(_alloc_rate_ms_seq);
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}
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double G1Analytics::predict_cost_per_card_ms() const {
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  return get_new_prediction(_cost_per_card_ms_seq);
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}
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double G1Analytics::predict_scan_hcc_ms() const {
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  return get_new_prediction(_cost_scan_hcc_seq);
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}
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double G1Analytics::predict_rs_update_time_ms(size_t pending_cards) const {
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  return pending_cards * predict_cost_per_card_ms() + predict_scan_hcc_ms();
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}
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double G1Analytics::predict_young_cards_per_entry_ratio() const {
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  return get_new_prediction(_young_cards_per_entry_ratio_seq);
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}
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double G1Analytics::predict_mixed_cards_per_entry_ratio() const {
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  if (_mixed_cards_per_entry_ratio_seq->num() < 2) {
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    return predict_young_cards_per_entry_ratio();
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  } else {
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    return get_new_prediction(_mixed_cards_per_entry_ratio_seq);
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  }
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}
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size_t G1Analytics::predict_card_num(size_t rs_length, bool gcs_are_young) const {
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  if (gcs_are_young) {
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    return (size_t) (rs_length * predict_young_cards_per_entry_ratio());
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  } else {
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    return (size_t) (rs_length * predict_mixed_cards_per_entry_ratio());
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  }
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}
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double G1Analytics::predict_rs_scan_time_ms(size_t card_num, bool gcs_are_young) const {
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  if (gcs_are_young) {
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    return card_num * get_new_prediction(_cost_per_entry_ms_seq);
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  } else {
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    return predict_mixed_rs_scan_time_ms(card_num);
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  }
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}
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double G1Analytics::predict_mixed_rs_scan_time_ms(size_t card_num) const {
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  if (_mixed_cost_per_entry_ms_seq->num() < 3) {
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    return card_num * get_new_prediction(_cost_per_entry_ms_seq);
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  } else {
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    return card_num * get_new_prediction(_mixed_cost_per_entry_ms_seq);
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  }
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}
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double G1Analytics::predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) const {
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  if (_cost_per_byte_ms_during_cm_seq->num() < 3) {
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    return (1.1 * bytes_to_copy) * get_new_prediction(_cost_per_byte_ms_seq);
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  } else {
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    return bytes_to_copy * get_new_prediction(_cost_per_byte_ms_during_cm_seq);
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  }
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}
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double G1Analytics::predict_object_copy_time_ms(size_t bytes_to_copy, bool during_concurrent_mark) const {
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  if (during_concurrent_mark) {
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    return predict_object_copy_time_ms_during_cm(bytes_to_copy);
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  } else {
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    return bytes_to_copy * get_new_prediction(_cost_per_byte_ms_seq);
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  }
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}
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double G1Analytics::predict_cost_per_byte_ms() const {
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  return get_new_prediction(_cost_per_byte_ms_seq);
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}
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double G1Analytics::predict_constant_other_time_ms() const {
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  return get_new_prediction(_constant_other_time_ms_seq);
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}
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double G1Analytics::predict_young_other_time_ms(size_t young_num) const {
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  return young_num * get_new_prediction(_young_other_cost_per_region_ms_seq);
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}
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double G1Analytics::predict_non_young_other_time_ms(size_t non_young_num) const {
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  return non_young_num * get_new_prediction(_non_young_other_cost_per_region_ms_seq);
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}
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double G1Analytics::predict_remark_time_ms() const {
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  return get_new_prediction(_concurrent_mark_remark_times_ms);
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}
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double G1Analytics::predict_cleanup_time_ms() const {
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  return get_new_prediction(_concurrent_mark_cleanup_times_ms);
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}
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size_t G1Analytics::predict_rs_lengths() const {
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  return get_new_size_prediction(_rs_lengths_seq);
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}
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size_t G1Analytics::predict_pending_cards() const {
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  return get_new_size_prediction(_pending_cards_seq);
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}
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double G1Analytics::last_known_gc_end_time_sec() const {
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  return _recent_prev_end_times_for_all_gcs_sec->oldest();
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}
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void G1Analytics::update_recent_gc_times(double end_time_sec,
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                                         double pause_time_ms) {
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  _recent_gc_times_ms->add(pause_time_ms);
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  _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec);
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  _prev_collection_pause_end_ms = end_time_sec * 1000.0;
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}
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void G1Analytics::report_concurrent_mark_cleanup_times_ms(double ms) {
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  _concurrent_mark_cleanup_times_ms->add(ms);
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}