342
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1 /*
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2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_coTracker.cpp.incl"
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27
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28 COTracker* COTracker::_head = NULL;
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29 double COTracker::_cpu_number = -1.0;
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30
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31 void
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32 COTracker::resetPeriod(double now_sec, double vnow_sec) {
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33 guarantee( _enabled, "invariant" );
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34 _period_start_time_sec = now_sec;
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35 _period_start_vtime_sec = vnow_sec;
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36 }
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37
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38 void
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39 COTracker::setConcOverhead(double time_stamp_sec,
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40 double conc_overhead) {
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41 guarantee( _enabled, "invariant" );
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42 _conc_overhead = conc_overhead;
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43 _time_stamp_sec = time_stamp_sec;
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44 if (conc_overhead > 0.001)
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45 _conc_overhead_seq.add(conc_overhead);
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46 }
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47
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48 void
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49 COTracker::reset(double starting_conc_overhead) {
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50 guarantee( _enabled, "invariant" );
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51 double now_sec = os::elapsedTime();
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52 setConcOverhead(now_sec, starting_conc_overhead);
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53 }
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54
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55 void
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56 COTracker::start() {
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57 guarantee( _enabled, "invariant" );
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58 resetPeriod(os::elapsedTime(), os::elapsedVTime());
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59 }
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60
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61 void
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62 COTracker::update(bool force_end) {
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63 assert( _enabled, "invariant" );
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64 double end_time_sec = os::elapsedTime();
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65 double elapsed_time_sec = end_time_sec - _period_start_time_sec;
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66 if (force_end || elapsed_time_sec > _update_period_sec) {
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67 // reached the end of the period
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68 double end_vtime_sec = os::elapsedVTime();
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69 double elapsed_vtime_sec = end_vtime_sec - _period_start_vtime_sec;
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70
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71 double conc_overhead = elapsed_vtime_sec / elapsed_time_sec;
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72
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73 setConcOverhead(end_time_sec, conc_overhead);
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74 resetPeriod(end_time_sec, end_vtime_sec);
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75 }
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76 }
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77
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78 void
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79 COTracker::updateForSTW(double start_sec, double end_sec) {
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80 if (!_enabled)
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81 return;
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82
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83 // During a STW pause, no concurrent GC thread has done any
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84 // work. So, we can safely adjust the start of the current period by
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85 // adding the duration of the STW pause to it, so that the STW pause
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86 // doesn't affect the reading of the concurrent overhead (it's
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87 // basically like excluding the time of the STW pause from the
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88 // concurrent overhead calculation).
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89
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90 double stw_duration_sec = end_sec - start_sec;
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91 guarantee( stw_duration_sec > 0.0, "invariant" );
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92
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93 if (outOfDate(start_sec))
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94 _conc_overhead = 0.0;
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95 else
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96 _time_stamp_sec = end_sec;
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97 _period_start_time_sec += stw_duration_sec;
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98 _conc_overhead_seq = NumberSeq();
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99
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100 guarantee( os::elapsedTime() > _period_start_time_sec, "invariant" );
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101 }
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102
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103 double
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104 COTracker::predConcOverhead() {
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105 if (_enabled) {
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106 // tty->print(" %1.2lf", _conc_overhead_seq.maximum());
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107 return _conc_overhead_seq.maximum();
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108 } else {
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109 // tty->print(" DD");
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110 return 0.0;
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111 }
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112 }
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113
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114 void
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115 COTracker::resetPred() {
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116 _conc_overhead_seq = NumberSeq();
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117 }
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118
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119 COTracker::COTracker(int group)
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120 : _enabled(false),
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121 _group(group),
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122 _period_start_time_sec(-1.0),
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123 _period_start_vtime_sec(-1.0),
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124 _conc_overhead(-1.0),
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125 _time_stamp_sec(-1.0),
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126 _next(NULL) {
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127 // GCOverheadReportingPeriodMS indicates how frequently the
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128 // concurrent overhead will be recorded by the GC Overhead
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129 // Reporter. We want to take readings less often than that. If we
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130 // took readings more often than some of them might be lost.
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131 _update_period_sec = ((double) GCOverheadReportingPeriodMS) / 1000.0 * 1.25;
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132 _next = _head;
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133 _head = this;
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134
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135 if (_cpu_number < 0.0)
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136 _cpu_number = (double) os::processor_count();
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137 }
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138
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139 // statics
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140
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141 void
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142 COTracker::updateAllForSTW(double start_sec, double end_sec) {
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143 for (COTracker* curr = _head; curr != NULL; curr = curr->_next) {
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144 curr->updateForSTW(start_sec, end_sec);
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145 }
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146 }
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147
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148 double
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149 COTracker::totalConcOverhead(double now_sec) {
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150 double total_conc_overhead = 0.0;
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151
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152 for (COTracker* curr = _head; curr != NULL; curr = curr->_next) {
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153 double conc_overhead = curr->concOverhead(now_sec);
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154 total_conc_overhead += conc_overhead;
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155 }
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156
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157 return total_conc_overhead;
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158 }
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159
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160 double
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161 COTracker::totalConcOverhead(double now_sec,
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162 size_t group_num,
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163 double* co_per_group) {
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164 double total_conc_overhead = 0.0;
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165
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166 for (size_t i = 0; i < group_num; ++i)
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167 co_per_group[i] = 0.0;
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168
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169 for (COTracker* curr = _head; curr != NULL; curr = curr->_next) {
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170 size_t group = curr->_group;
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171 assert( 0 <= group && group < group_num, "invariant" );
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172 double conc_overhead = curr->concOverhead(now_sec);
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173
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174 co_per_group[group] += conc_overhead;
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175 total_conc_overhead += conc_overhead;
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176 }
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177
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178 return total_conc_overhead;
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179 }
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180
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181 double
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182 COTracker::totalPredConcOverhead() {
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183 double total_pred_conc_overhead = 0.0;
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184 for (COTracker* curr = _head; curr != NULL; curr = curr->_next) {
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185 total_pred_conc_overhead += curr->predConcOverhead();
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186 curr->resetPred();
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187 }
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188 return total_pred_conc_overhead / _cpu_number;
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189 }
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