1 /* 2 * Copyright (c) 2003, 2013, 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.debugger.JVMDebugger; 33 import sun.jvm.hotspot.memory.*; 34 import sun.jvm.hotspot.oops.*; 35 import sun.jvm.hotspot.runtime.*; 36 37 public class HeapSummary extends Tool { 38 39 public HeapSummary() { 40 super(); 41 } 42 43 public HeapSummary(JVMDebugger d) { 44 super(d); 45 } 46 47 public static void main(String[] args) { 48 HeapSummary hs = new HeapSummary(); 49 hs.execute(args); 50 } 51 52 public void run() { 53 CollectedHeap heap = VM.getVM().getUniverse().heap(); 54 VM.Flag[] flags = VM.getVM().getCommandLineFlags(); 55 Map flagMap = new HashMap(); 56 if (flags == null) { 57 System.out.println("WARNING: command line flags are not available"); 58 } else { 59 for (int f = 0; f < flags.length; f++) { 60 flagMap.put(flags[f].getName(), flags[f]); 61 } 62 } 63 64 System.out.println(); 65 printGCAlgorithm(flagMap); 66 System.out.println(); 67 System.out.println("Heap Configuration:"); 68 printValue("MinHeapFreeRatio = ", getFlagValue("MinHeapFreeRatio", flagMap)); 69 printValue("MaxHeapFreeRatio = ", getFlagValue("MaxHeapFreeRatio", flagMap)); 70 printValMB("MaxHeapSize = ", getFlagValue("MaxHeapSize", flagMap)); 71 printValMB("NewSize = ", getFlagValue("NewSize", flagMap)); 72 printValMB("MaxNewSize = ", getFlagValue("MaxNewSize", flagMap)); 73 printValMB("OldSize = ", getFlagValue("OldSize", flagMap)); 74 printValue("NewRatio = ", getFlagValue("NewRatio", flagMap)); 75 printValue("SurvivorRatio = ", getFlagValue("SurvivorRatio", flagMap)); 76 printValMB("MetaspaceSize = ", getFlagValue("MetaspaceSize", flagMap)); 77 printValMB("CompressedClassSpaceSize = ", getFlagValue("CompressedClassSpaceSize", flagMap)); 78 printValMB("MaxMetaspaceSize = ", getFlagValue("MaxMetaspaceSize", flagMap)); 79 printValMB("G1HeapRegionSize = ", HeapRegion.grainBytes()); 80 81 System.out.println(); 82 System.out.println("Heap Usage:"); 83 84 if (heap instanceof SharedHeap) { 85 SharedHeap sharedHeap = (SharedHeap) heap; 86 if (sharedHeap instanceof GenCollectedHeap) { 87 GenCollectedHeap genHeap = (GenCollectedHeap) sharedHeap; 88 for (int n = 0; n < genHeap.nGens(); n++) { 89 Generation gen = genHeap.getGen(n); 90 if (gen instanceof sun.jvm.hotspot.memory.DefNewGeneration) { 91 System.out.println("New Generation (Eden + 1 Survivor Space):"); 92 printGen(gen); 93 94 ContiguousSpace eden = ((DefNewGeneration)gen).eden(); 95 System.out.println("Eden Space:"); 96 printSpace(eden); 97 98 ContiguousSpace from = ((DefNewGeneration)gen).from(); 99 System.out.println("From Space:"); 100 printSpace(from); 101 102 ContiguousSpace to = ((DefNewGeneration)gen).to(); 103 System.out.println("To Space:"); 104 printSpace(to); 105 } else { 106 System.out.println(gen.name() + ":"); 107 printGen(gen); 108 } 109 } 110 } else if (sharedHeap instanceof G1CollectedHeap) { 111 G1CollectedHeap g1h = (G1CollectedHeap) sharedHeap; 112 G1MonitoringSupport g1mm = g1h.g1mm(); 113 long edenRegionNum = g1mm.edenRegionNum(); 114 long survivorRegionNum = g1mm.survivorRegionNum(); 115 HeapRegionSetBase oldSet = g1h.oldSet(); 116 HeapRegionSetBase humongousSet = g1h.humongousSet(); 117 long oldRegionNum = oldSet.regionNum() + humongousSet.regionNum(); 118 printG1Space("G1 Heap:", g1h.n_regions(), 119 g1h.used(), g1h.capacity()); 120 System.out.println("G1 Young Generation:"); 121 printG1Space("Eden Space:", edenRegionNum, 122 g1mm.edenUsed(), g1mm.edenCommitted()); 123 printG1Space("Survivor Space:", survivorRegionNum, 124 g1mm.survivorUsed(), g1mm.survivorCommitted()); 125 printG1Space("G1 Old Generation:", oldRegionNum, 126 g1mm.oldUsed(), g1mm.oldCommitted()); 127 } else { 128 throw new RuntimeException("unknown SharedHeap type : " + heap.getClass()); 129 } 130 } else if (heap instanceof ParallelScavengeHeap) { 131 ParallelScavengeHeap psh = (ParallelScavengeHeap) heap; 132 PSYoungGen youngGen = psh.youngGen(); 133 printPSYoungGen(youngGen); 134 135 PSOldGen oldGen = psh.oldGen(); 136 long oldFree = oldGen.capacity() - oldGen.used(); 137 System.out.println("PS Old Generation"); 138 printValMB("capacity = ", oldGen.capacity()); 139 printValMB("used = ", oldGen.used()); 140 printValMB("free = ", oldFree); 141 System.out.println(alignment + (double)oldGen.used() * 100.0 / oldGen.capacity() + "% used"); 142 } else { 143 throw new RuntimeException("unknown CollectedHeap type : " + heap.getClass()); 144 } 145 146 System.out.println(); 147 printInternStringStatistics(); 148 } 149 150 // Helper methods 151 152 private void printGCAlgorithm(Map flagMap) { 153 // print about new generation 154 long l = getFlagValue("UseParNewGC", flagMap); 155 if (l == 1L) { 156 System.out.println("using parallel threads in the new generation."); 157 } 158 159 l = getFlagValue("UseTLAB", flagMap); 160 if (l == 1L) { 161 System.out.println("using thread-local object allocation."); 162 } 163 164 l = getFlagValue("UseConcMarkSweepGC", flagMap); 165 if (l == 1L) { 166 System.out.println("Concurrent Mark-Sweep GC"); 167 return; 168 } 169 170 l = getFlagValue("UseParallelGC", flagMap); 171 if (l == 1L) { 172 System.out.print("Parallel GC "); 173 l = getFlagValue("ParallelGCThreads", flagMap); 174 System.out.println("with " + l + " thread(s)"); 175 return; 176 } 177 178 l = getFlagValue("UseG1GC", flagMap); 179 if (l == 1L) { 180 System.out.print("Garbage-First (G1) GC "); 181 l = getFlagValue("ParallelGCThreads", flagMap); 182 System.out.println("with " + l + " thread(s)"); 183 return; 184 } 185 186 System.out.println("Mark Sweep Compact GC"); 187 } 188 189 private void printPSYoungGen(PSYoungGen youngGen) { 190 System.out.println("PS Young Generation"); 191 MutableSpace eden = youngGen.edenSpace(); 192 System.out.println("Eden Space:"); 193 printMutableSpace(eden); 194 MutableSpace from = youngGen.fromSpace(); 195 System.out.println("From Space:"); 196 printMutableSpace(from); 197 MutableSpace to = youngGen.toSpace(); 198 System.out.println("To Space:"); 199 printMutableSpace(to); 200 } 201 202 private void printMutableSpace(MutableSpace space) { 203 printValMB("capacity = ", space.capacity()); 204 printValMB("used = ", space.used()); 205 long free = space.capacity() - space.used(); 206 printValMB("free = ", free); 207 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used"); 208 } 209 210 private static String alignment = " "; 211 212 private void printGen(Generation gen) { 213 printValMB("capacity = ", gen.capacity()); 214 printValMB("used = ", gen.used()); 215 printValMB("free = ", gen.free()); 216 System.out.println(alignment + (double)gen.used() * 100.0 / gen.capacity() + "% used"); 217 } 218 219 private void printSpace(ContiguousSpace space) { 220 printValMB("capacity = ", space.capacity()); 221 printValMB("used = ", space.used()); 222 printValMB("free = ", space.free()); 223 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used"); 224 } 225 226 private void printG1Space(String spaceName, long regionNum, 227 long used, long capacity) { 228 long free = capacity - used; 229 System.out.println(spaceName); 230 printValue("regions = ", regionNum); 231 printValMB("capacity = ", capacity); 232 printValMB("used = ", used); 233 printValMB("free = ", free); 234 double occPerc = (capacity > 0) ? (double) used * 100.0 / capacity : 0.0; 235 System.out.println(alignment + occPerc + "% used"); 236 } 237 238 private static final double FACTOR = 1024*1024; 239 private void printValMB(String title, long value) { 240 if (value < 0) { 241 System.out.println(alignment + title + (value >>> 20) + " MB"); 242 } else { 243 double mb = value/FACTOR; 244 System.out.println(alignment + title + value + " (" + mb + "MB)"); 245 } 246 } 247 248 private void printValue(String title, long value) { 249 System.out.println(alignment + title + value); 250 } 251 252 private long getFlagValue(String name, Map flagMap) { 253 VM.Flag f = (VM.Flag) flagMap.get(name); 254 if (f != null) { 255 if (f.isBool()) { 256 return f.getBool()? 1L : 0L; 257 } else { 258 return Long.parseLong(f.getValue()); 259 } 260 } else { 261 return -1; 262 } 263 } 264 265 private void printInternStringStatistics() { 266 class StringStat implements StringTable.StringVisitor { 267 private int count; 268 private long size; 269 private OopField stringValueField; 270 271 StringStat() { 272 VM vm = VM.getVM(); 273 SystemDictionary sysDict = vm.getSystemDictionary(); 274 InstanceKlass strKlass = sysDict.getStringKlass(); 275 // String has a field named 'value' of type 'char[]'. 276 stringValueField = (OopField) strKlass.findField("value", "[C"); 277 } 278 279 private long stringSize(Instance instance) { 280 // We include String content in size calculation. 281 return instance.getObjectSize() + 282 stringValueField.getValue(instance).getObjectSize(); 283 } 284 285 public void visit(Instance str) { 286 count++; 287 size += stringSize(str); 288 } 289 290 public void print() { 291 System.out.println(count + 292 " interned Strings occupying " + size + " bytes."); 293 } 294 } 295 296 StringStat stat = new StringStat(); 297 StringTable strTable = VM.getVM().getStringTable(); 298 strTable.stringsDo(stat); 299 stat.print(); 300 } 301 }