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1 /*
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2 * Copyright 2003-2005 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 package sun.jvm.hotspot.tools;
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26
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27 import java.util.*;
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28 import sun.jvm.hotspot.gc_interface.*;
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29 import sun.jvm.hotspot.gc_implementation.parallelScavenge.*;
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30 import sun.jvm.hotspot.gc_implementation.shared.*;
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31 import sun.jvm.hotspot.memory.*;
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32 import sun.jvm.hotspot.runtime.*;
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33 import sun.jvm.hotspot.tools.*;
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34
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35 public class HeapSummary extends Tool {
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36
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37 public static void main(String[] args) {
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38 HeapSummary hs = new HeapSummary();
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39 hs.start(args);
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40 hs.stop();
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41 }
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42
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43 public void run() {
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44 CollectedHeap heap = VM.getVM().getUniverse().heap();
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45 VM.Flag[] flags = VM.getVM().getCommandLineFlags();
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46 Map flagMap = new HashMap();
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47 if (flags == null) {
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48 System.out.println("WARNING: command line flags are not available");
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49 } else {
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50 for (int f = 0; f < flags.length; f++) {
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51 flagMap.put(flags[f].getName(), flags[f]);
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52 }
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53 }
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54
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55 System.out.println();
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56 printGCAlgorithm(flagMap);
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57 System.out.println();
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58 System.out.println("Heap Configuration:");
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59 printValue("MinHeapFreeRatio = ", getFlagValue("MinHeapFreeRatio", flagMap));
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60 printValue("MaxHeapFreeRatio = ", getFlagValue("MaxHeapFreeRatio", flagMap));
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61 printValMB("MaxHeapSize = ", getFlagValue("MaxHeapSize", flagMap));
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62 printValMB("NewSize = ", getFlagValue("NewSize", flagMap));
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63 printValMB("MaxNewSize = ", getFlagValue("MaxNewSize", flagMap));
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64 printValMB("OldSize = ", getFlagValue("OldSize", flagMap));
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65 printValue("NewRatio = ", getFlagValue("NewRatio", flagMap));
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66 printValue("SurvivorRatio = ", getFlagValue("SurvivorRatio", flagMap));
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67 printValMB("PermSize = ", getFlagValue("PermSize", flagMap));
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68 printValMB("MaxPermSize = ", getFlagValue("MaxPermSize", flagMap));
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69
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70 System.out.println();
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71 System.out.println("Heap Usage:");
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72
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73 if (heap instanceof GenCollectedHeap) {
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74 GenCollectedHeap genHeap = (GenCollectedHeap) heap;
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75 for (int n = 0; n < genHeap.nGens(); n++) {
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76 Generation gen = genHeap.getGen(n);
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77 if (gen instanceof sun.jvm.hotspot.memory.DefNewGeneration) {
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78 System.out.println("New Generation (Eden + 1 Survivor Space):");
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79 printGen(gen);
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80
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81 ContiguousSpace eden = ((DefNewGeneration)gen).eden();
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82 System.out.println("Eden Space:");
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83 printSpace(eden);
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84
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85 ContiguousSpace from = ((DefNewGeneration)gen).from();
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86 System.out.println("From Space:");
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87 printSpace(from);
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88
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89 ContiguousSpace to = ((DefNewGeneration)gen).to();
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90 System.out.println("To Space:");
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91 printSpace(to);
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92 } else {
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93 System.out.println(gen.name() + ":");
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94 printGen(gen);
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95 }
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96 }
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97 // Perm generation
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98 Generation permGen = genHeap.permGen();
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99 System.out.println("Perm Generation:");
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100 printGen(permGen);
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101 } else if (heap instanceof ParallelScavengeHeap) {
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102 ParallelScavengeHeap psh = (ParallelScavengeHeap) heap;
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103 PSYoungGen youngGen = psh.youngGen();
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104 printPSYoungGen(youngGen);
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105
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106 PSOldGen oldGen = psh.oldGen();
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107 long oldFree = oldGen.capacity() - oldGen.used();
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108 System.out.println("PS Old Generation");
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109 printValMB("capacity = ", oldGen.capacity());
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110 printValMB("used = ", oldGen.used());
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111 printValMB("free = ", oldFree);
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112 System.out.println(alignment + (double)oldGen.used() * 100.0 / oldGen.capacity() + "% used");
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113
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114 PSPermGen permGen = psh.permGen();
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115 long permFree = permGen.capacity() - permGen.used();
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116 System.out.println("PS Perm Generation");
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117 printValMB("capacity = ", permGen.capacity());
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118 printValMB("used = ", permGen.used());
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119 printValMB("free = ", permFree);
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120 System.out.println(alignment + (double)permGen.used() * 100.0 / permGen.capacity() + "% used");
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121 } else {
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122 throw new RuntimeException("unknown heap type : " + heap.getClass());
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123 }
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124 }
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125
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126 // Helper methods
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127
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128 private void printGCAlgorithm(Map flagMap) {
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129 // print about new generation
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130 long l = getFlagValue("UseParNewGC", flagMap);
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131 if (l == 1L) {
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132 System.out.println("using parallel threads in the new generation.");
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133 }
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134
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135 l = getFlagValue("UseTLAB", flagMap);
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136 if (l == 1L) {
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137 System.out.println("using thread-local object allocation.");
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138 }
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139
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140 l = getFlagValue("UseConcMarkSweepGC", flagMap);
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141 if (l == 1L) {
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142 System.out.println("Concurrent Mark-Sweep GC");
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143 return;
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144 }
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145
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146 l = getFlagValue("UseParallelGC", flagMap);
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147 if (l == 1L) {
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148 System.out.print("Parallel GC ");
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149 l = getFlagValue("ParallelGCThreads", flagMap);
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150 System.out.println("with " + l + " thread(s)");
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151 return;
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152 }
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153
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154 System.out.println("Mark Sweep Compact GC");
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155 }
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156
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157 private void printPSYoungGen(PSYoungGen youngGen) {
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158 System.out.println("PS Young Generation");
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159 MutableSpace eden = youngGen.edenSpace();
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160 System.out.println("Eden Space:");
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161 printMutableSpace(eden);
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162 MutableSpace from = youngGen.fromSpace();
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163 System.out.println("From Space:");
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164 printMutableSpace(from);
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165 MutableSpace to = youngGen.toSpace();
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166 System.out.println("To Space:");
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167 printMutableSpace(to);
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168 }
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169
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170 private void printMutableSpace(MutableSpace space) {
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171 printValMB("capacity = ", space.capacity());
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172 printValMB("used = ", space.used());
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173 long free = space.capacity() - space.used();
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174 printValMB("free = ", free);
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175 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
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176 }
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177
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178 private static String alignment = " ";
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179
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180 private void printGen(Generation gen) {
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181 printValMB("capacity = ", gen.capacity());
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182 printValMB("used = ", gen.used());
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183 printValMB("free = ", gen.free());
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184 System.out.println(alignment + (double)gen.used() * 100.0 / gen.capacity() + "% used");
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185 }
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186
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187 private void printSpace(ContiguousSpace space) {
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188 printValMB("capacity = ", space.capacity());
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189 printValMB("used = ", space.used());
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190 printValMB("free = ", space.free());
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191 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
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192 }
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193
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194 private static final double FACTOR = 1024*1024;
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195 private void printValMB(String title, long value) {
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196 double mb = value / FACTOR;
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197 System.out.println(alignment + title + value + " (" + mb + "MB)");
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198 }
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199
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200 private void printValue(String title, long value) {
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201 System.out.println(alignment + title + value);
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202 }
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203
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204 private long getFlagValue(String name, Map flagMap) {
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205 VM.Flag f = (VM.Flag) flagMap.get(name);
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206 if (f != null) {
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207 if (f.isBool()) {
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208 return f.getBool()? 1L : 0L;
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209 } else {
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210 return Long.parseLong(f.getValue());
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211 }
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212 } else {
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213 return -1;
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214 }
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215 }
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216 }
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