1 /* 2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.tools; 26 27 import java.util.*; 28 import sun.jvm.hotspot.gc_interface.*; 29 import sun.jvm.hotspot.gc_implementation.g1.*; 30 import sun.jvm.hotspot.gc_implementation.parallelScavenge.*; 31 import sun.jvm.hotspot.gc_implementation.shared.*; 32 import sun.jvm.hotspot.memory.*; 33 import sun.jvm.hotspot.oops.*; 34 import sun.jvm.hotspot.runtime.*; 35 36 public class HeapSummary extends Tool { 37 38 public static void main(String[] args) { 39 HeapSummary hs = new HeapSummary(); 40 hs.start(args); 41 hs.stop(); 42 } 43 44 public void run() { 45 CollectedHeap heap = VM.getVM().getUniverse().heap(); 46 VM.Flag[] flags = VM.getVM().getCommandLineFlags(); 47 Map flagMap = new HashMap(); 48 if (flags == null) { 49 System.out.println("WARNING: command line flags are not available"); 50 } else { 51 for (int f = 0; f < flags.length; f++) { 52 flagMap.put(flags[f].getName(), flags[f]); 53 } 54 } 55 56 System.out.println(); 57 printGCAlgorithm(flagMap); 58 System.out.println(); 59 System.out.println("Heap Configuration:"); 60 printValue("MinHeapFreeRatio = ", getFlagValue("MinHeapFreeRatio", flagMap)); 61 printValue("MaxHeapFreeRatio = ", getFlagValue("MaxHeapFreeRatio", flagMap)); 62 printValMB("MaxHeapSize = ", getFlagValue("MaxHeapSize", flagMap)); 63 printValMB("NewSize = ", getFlagValue("NewSize", flagMap)); 64 printValMB("MaxNewSize = ", getFlagValue("MaxNewSize", flagMap)); 65 printValMB("OldSize = ", getFlagValue("OldSize", flagMap)); 66 printValue("NewRatio = ", getFlagValue("NewRatio", flagMap)); 67 printValue("SurvivorRatio = ", getFlagValue("SurvivorRatio", flagMap)); 68 printValMB("MetaspaceSize = ", getFlagValue("MetaspaceSize", flagMap)); 69 printValMB("MaxMetaspaceSize = ", getFlagValue("MaxMetaspaceSize", flagMap)); 70 printValMB("G1HeapRegionSize = ", HeapRegion.grainBytes()); 71 72 System.out.println(); 73 System.out.println("Heap Usage:"); 74 75 if (heap instanceof SharedHeap) { 76 SharedHeap sharedHeap = (SharedHeap) heap; 77 if (sharedHeap instanceof GenCollectedHeap) { 78 GenCollectedHeap genHeap = (GenCollectedHeap) sharedHeap; 79 for (int n = 0; n < genHeap.nGens(); n++) { 80 Generation gen = genHeap.getGen(n); 81 if (gen instanceof sun.jvm.hotspot.memory.DefNewGeneration) { 82 System.out.println("New Generation (Eden + 1 Survivor Space):"); 83 printGen(gen); 84 85 ContiguousSpace eden = ((DefNewGeneration)gen).eden(); 86 System.out.println("Eden Space:"); 87 printSpace(eden); 88 89 ContiguousSpace from = ((DefNewGeneration)gen).from(); 90 System.out.println("From Space:"); 91 printSpace(from); 92 93 ContiguousSpace to = ((DefNewGeneration)gen).to(); 94 System.out.println("To Space:"); 95 printSpace(to); 96 } else { 97 System.out.println(gen.name() + ":"); 98 printGen(gen); 99 } 100 } 101 } else if (sharedHeap instanceof G1CollectedHeap) { 102 G1CollectedHeap g1h = (G1CollectedHeap) sharedHeap; 103 G1MonitoringSupport g1mm = g1h.g1mm(); 104 long edenRegionNum = g1mm.edenRegionNum(); 105 long survivorRegionNum = g1mm.survivorRegionNum(); 106 HeapRegionSetBase oldSet = g1h.oldSet(); 107 HeapRegionSetBase humongousSet = g1h.humongousSet(); 108 long oldRegionNum = oldSet.regionNum() + humongousSet.regionNum(); 109 printG1Space("G1 Heap:", g1h.n_regions(), 110 g1h.used(), g1h.capacity()); 111 System.out.println("G1 Young Generation:"); 112 printG1Space("Eden Space:", edenRegionNum, 113 g1mm.edenUsed(), g1mm.edenCommitted()); 114 printG1Space("Survivor Space:", survivorRegionNum, 115 g1mm.survivorUsed(), g1mm.survivorCommitted()); 116 printG1Space("G1 Old Generation:", oldRegionNum, 117 g1mm.oldUsed(), g1mm.oldCommitted()); 118 } else { 119 throw new RuntimeException("unknown SharedHeap type : " + heap.getClass()); 120 } 121 } else if (heap instanceof ParallelScavengeHeap) { 122 ParallelScavengeHeap psh = (ParallelScavengeHeap) heap; 123 PSYoungGen youngGen = psh.youngGen(); 124 printPSYoungGen(youngGen); 125 126 PSOldGen oldGen = psh.oldGen(); 127 long oldFree = oldGen.capacity() - oldGen.used(); 128 System.out.println("PS Old Generation"); 129 printValMB("capacity = ", oldGen.capacity()); 130 printValMB("used = ", oldGen.used()); 131 printValMB("free = ", oldFree); 132 System.out.println(alignment + (double)oldGen.used() * 100.0 / oldGen.capacity() + "% used"); 133 } else { 134 throw new RuntimeException("unknown CollectedHeap type : " + heap.getClass()); 135 } 136 137 System.out.println(); 138 printInternStringStatistics(); 139 } 140 141 // Helper methods 142 143 private void printGCAlgorithm(Map flagMap) { 144 // print about new generation 145 long l = getFlagValue("UseParNewGC", flagMap); 146 if (l == 1L) { 147 System.out.println("using parallel threads in the new generation."); 148 } 149 150 l = getFlagValue("UseTLAB", flagMap); 151 if (l == 1L) { 152 System.out.println("using thread-local object allocation."); 153 } 154 155 l = getFlagValue("UseConcMarkSweepGC", flagMap); 156 if (l == 1L) { 157 System.out.println("Concurrent Mark-Sweep GC"); 158 return; 159 } 160 161 l = getFlagValue("UseParallelGC", flagMap); 162 if (l == 1L) { 163 System.out.print("Parallel GC "); 164 l = getFlagValue("ParallelGCThreads", flagMap); 165 System.out.println("with " + l + " thread(s)"); 166 return; 167 } 168 169 l = getFlagValue("UseG1GC", flagMap); 170 if (l == 1L) { 171 System.out.print("Garbage-First (G1) GC "); 172 l = getFlagValue("ParallelGCThreads", flagMap); 173 System.out.println("with " + l + " thread(s)"); 174 return; 175 } 176 177 System.out.println("Mark Sweep Compact GC"); 178 } 179 180 private void printPSYoungGen(PSYoungGen youngGen) { 181 System.out.println("PS Young Generation"); 182 MutableSpace eden = youngGen.edenSpace(); 183 System.out.println("Eden Space:"); 184 printMutableSpace(eden); 185 MutableSpace from = youngGen.fromSpace(); 186 System.out.println("From Space:"); 187 printMutableSpace(from); 188 MutableSpace to = youngGen.toSpace(); 189 System.out.println("To Space:"); 190 printMutableSpace(to); 191 } 192 193 private void printMutableSpace(MutableSpace space) { 194 printValMB("capacity = ", space.capacity()); 195 printValMB("used = ", space.used()); 196 long free = space.capacity() - space.used(); 197 printValMB("free = ", free); 198 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used"); 199 } 200 201 private static String alignment = " "; 202 203 private void printGen(Generation gen) { 204 printValMB("capacity = ", gen.capacity()); 205 printValMB("used = ", gen.used()); 206 printValMB("free = ", gen.free()); 207 System.out.println(alignment + (double)gen.used() * 100.0 / gen.capacity() + "% used"); 208 } 209 210 private void printSpace(ContiguousSpace space) { 211 printValMB("capacity = ", space.capacity()); 212 printValMB("used = ", space.used()); 213 printValMB("free = ", space.free()); 214 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used"); 215 } 216 217 private void printG1Space(String spaceName, long regionNum, 218 long used, long capacity) { 219 long free = capacity - used; 220 System.out.println(spaceName); 221 printValue("regions = ", regionNum); 222 printValMB("capacity = ", capacity); 223 printValMB("used = ", used); 224 printValMB("free = ", free); 225 double occPerc = (capacity > 0) ? (double) used * 100.0 / capacity : 0.0; 226 System.out.println(alignment + occPerc + "% used"); 227 } 228 229 private static final double FACTOR = 1024*1024; 230 private void printValMB(String title, long value) { 231 if (value < 0) { 232 System.out.println(alignment + title + (value >>> 20) + " MB"); 233 } else { 234 double mb = value/FACTOR; 235 System.out.println(alignment + title + value + " (" + mb + "MB)"); 236 } 237 } 238 239 private void printValue(String title, long value) { 240 System.out.println(alignment + title + value); 241 } 242 243 private long getFlagValue(String name, Map flagMap) { 244 VM.Flag f = (VM.Flag) flagMap.get(name); 245 if (f != null) { 246 if (f.isBool()) { 247 return f.getBool()? 1L : 0L; 248 } else { 249 return Long.parseLong(f.getValue()); 250 } 251 } else { 252 return -1; 253 } 254 } 255 256 private void printInternStringStatistics() { 257 class StringStat implements StringTable.StringVisitor { 258 private int count; 259 private long size; 260 private OopField stringValueField; 261 262 StringStat() { 263 VM vm = VM.getVM(); 264 SystemDictionary sysDict = vm.getSystemDictionary(); 265 InstanceKlass strKlass = sysDict.getStringKlass(); 266 // String has a field named 'value' of type 'char[]'. 267 stringValueField = (OopField) strKlass.findField("value", "[C"); 268 } 269 270 private long stringSize(Instance instance) { 271 // We include String content in size calculation. 272 return instance.getObjectSize() + 273 stringValueField.getValue(instance).getObjectSize(); 274 } 275 276 public void visit(Instance str) { 277 count++; 278 size += stringSize(str); 279 } 280 281 public void print() { 282 System.out.println(count + 283 " interned Strings occupying " + size + " bytes."); 284 } 285 } 286 287 StringStat stat = new StringStat(); 288 StringTable strTable = VM.getVM().getStringTable(); 289 strTable.stringsDo(stat); 290 stat.print(); 291 } 292 }