1 /* 2 * Copyright (c) 2003, 2015, 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.g1.*; 29 import sun.jvm.hotspot.gc.parallel.*; 30 import sun.jvm.hotspot.gc.serial.*; 31 import sun.jvm.hotspot.gc.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 GenCollectedHeap) { 85 GenCollectedHeap genHeap = (GenCollectedHeap) heap; 86 for (int n = 0; n < genHeap.nGens(); n++) { 87 Generation gen = genHeap.getGen(n); 88 if (gen instanceof DefNewGeneration) { 89 System.out.println("New Generation (Eden + 1 Survivor Space):"); 90 printGen(gen); 91 92 ContiguousSpace eden = ((DefNewGeneration)gen).eden(); 93 System.out.println("Eden Space:"); 94 printSpace(eden); 95 96 ContiguousSpace from = ((DefNewGeneration)gen).from(); 97 System.out.println("From Space:"); 98 printSpace(from); 99 100 ContiguousSpace to = ((DefNewGeneration)gen).to(); 101 System.out.println("To Space:"); 102 printSpace(to); 103 } else { 104 System.out.println(gen.name() + ":"); 105 printGen(gen); 106 } 107 } 108 } else if (heap instanceof G1CollectedHeap) { 109 G1CollectedHeap g1h = (G1CollectedHeap) heap; 110 G1MonitoringSupport g1mm = g1h.g1mm(); 111 long edenRegionNum = g1mm.edenRegionNum(); 112 long survivorRegionNum = g1mm.survivorRegionNum(); 113 HeapRegionSetBase oldSet = g1h.oldSet(); 114 HeapRegionSetBase humongousSet = g1h.humongousSet(); 115 long oldRegionNum = oldSet.count().length() 116 + humongousSet.count().capacity() / HeapRegion.grainBytes(); 117 printG1Space("G1 Heap:", g1h.n_regions(), 118 g1h.used(), g1h.capacity()); 119 System.out.println("G1 Young Generation:"); 120 printG1Space("Eden Space:", edenRegionNum, 121 g1mm.edenUsed(), g1mm.edenCommitted()); 122 printG1Space("Survivor Space:", survivorRegionNum, 123 g1mm.survivorUsed(), g1mm.survivorCommitted()); 124 printG1Space("G1 Old Generation:", oldRegionNum, 125 g1mm.oldUsed(), g1mm.oldCommitted()); 126 } else if (heap instanceof ParallelScavengeHeap) { 127 ParallelScavengeHeap psh = (ParallelScavengeHeap) heap; 128 PSYoungGen youngGen = psh.youngGen(); 129 printPSYoungGen(youngGen); 130 131 PSOldGen oldGen = psh.oldGen(); 132 long oldFree = oldGen.capacity() - oldGen.used(); 133 System.out.println("PS Old Generation"); 134 printValMB("capacity = ", oldGen.capacity()); 135 printValMB("used = ", oldGen.used()); 136 printValMB("free = ", oldFree); 137 System.out.println(alignment + (double)oldGen.used() * 100.0 / oldGen.capacity() + "% used"); 138 } else { 139 throw new RuntimeException("unknown CollectedHeap type : " + heap.getClass()); 140 } 141 142 System.out.println(); 143 printInternStringStatistics(); 144 } 145 146 // Helper methods 147 148 private void printGCAlgorithm(Map flagMap) { 149 // print about new generation 150 long l = getFlagValue("UseParNewGC", flagMap); 151 if (l == 1L) { 152 System.out.println("using parallel threads in the new generation."); 153 } 154 155 l = getFlagValue("UseTLAB", flagMap); 156 if (l == 1L) { 157 System.out.println("using thread-local object allocation."); 158 } 159 160 l = getFlagValue("UseConcMarkSweepGC", flagMap); 161 if (l == 1L) { 162 System.out.println("Concurrent Mark-Sweep GC"); 163 return; 164 } 165 166 l = getFlagValue("UseParallelGC", flagMap); 167 if (l == 1L) { 168 System.out.print("Parallel GC "); 169 l = getFlagValue("ParallelGCThreads", flagMap); 170 System.out.println("with " + l + " thread(s)"); 171 return; 172 } 173 174 l = getFlagValue("UseG1GC", flagMap); 175 if (l == 1L) { 176 System.out.print("Garbage-First (G1) GC "); 177 l = getFlagValue("ParallelGCThreads", flagMap); 178 System.out.println("with " + l + " thread(s)"); 179 return; 180 } 181 182 System.out.println("Mark Sweep Compact GC"); 183 } 184 185 private void printPSYoungGen(PSYoungGen youngGen) { 186 System.out.println("PS Young Generation"); 187 MutableSpace eden = youngGen.edenSpace(); 188 System.out.println("Eden Space:"); 189 printMutableSpace(eden); 190 MutableSpace from = youngGen.fromSpace(); 191 System.out.println("From Space:"); 192 printMutableSpace(from); 193 MutableSpace to = youngGen.toSpace(); 194 System.out.println("To Space:"); 195 printMutableSpace(to); 196 } 197 198 private void printMutableSpace(MutableSpace space) { 199 printValMB("capacity = ", space.capacity()); 200 printValMB("used = ", space.used()); 201 long free = space.capacity() - space.used(); 202 printValMB("free = ", free); 203 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used"); 204 } 205 206 private static String alignment = " "; 207 208 private void printGen(Generation gen) { 209 printValMB("capacity = ", gen.capacity()); 210 printValMB("used = ", gen.used()); 211 printValMB("free = ", gen.free()); 212 System.out.println(alignment + (double)gen.used() * 100.0 / gen.capacity() + "% used"); 213 } 214 215 private void printSpace(ContiguousSpace space) { 216 printValMB("capacity = ", space.capacity()); 217 printValMB("used = ", space.used()); 218 printValMB("free = ", space.free()); 219 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used"); 220 } 221 222 private void printG1Space(String spaceName, long regionNum, 223 long used, long capacity) { 224 long free = capacity - used; 225 System.out.println(spaceName); 226 printValue("regions = ", regionNum); 227 printValMB("capacity = ", capacity); 228 printValMB("used = ", used); 229 printValMB("free = ", free); 230 double occPerc = (capacity > 0) ? (double) used * 100.0 / capacity : 0.0; 231 System.out.println(alignment + occPerc + "% used"); 232 } 233 234 private static final double FACTOR = 1024*1024; 235 private void printValMB(String title, long value) { 236 if (value < 0) { 237 System.out.println(alignment + title + (value >>> 20) + " MB"); 238 } else { 239 double mb = value/FACTOR; 240 System.out.println(alignment + title + value + " (" + mb + "MB)"); 241 } 242 } 243 244 private void printValue(String title, long value) { 245 System.out.println(alignment + title + value); 246 } 247 248 private long getFlagValue(String name, Map flagMap) { 249 VM.Flag f = (VM.Flag) flagMap.get(name); 250 if (f != null) { 251 if (f.isBool()) { 252 return f.getBool()? 1L : 0L; 253 } else { 254 return Long.parseLong(f.getValue()); 255 } 256 } else { 257 return -1; 258 } 259 } 260 261 private void printInternStringStatistics() { 262 class StringStat implements StringTable.StringVisitor { 263 private int count; 264 private long size; 265 private OopField stringValueField; 266 267 StringStat() { 268 VM vm = VM.getVM(); 269 SystemDictionary sysDict = vm.getSystemDictionary(); 270 InstanceKlass strKlass = sysDict.getStringKlass(); 271 // String has a field named 'value' of type 'byte[]'. 272 stringValueField = (OopField) strKlass.findField("value", "[B"); 273 } 274 275 private long stringSize(Instance instance) { 276 // We include String content in size calculation. 277 return instance.getObjectSize() + 278 stringValueField.getValue(instance).getObjectSize(); 279 } 280 281 public void visit(Instance str) { 282 count++; 283 size += stringSize(str); 284 } 285 286 public void print() { 287 System.out.println(count + 288 " interned Strings occupying " + size + " bytes."); 289 } 290 } 291 292 StringStat stat = new StringStat(); 293 StringTable strTable = VM.getVM().getStringTable(); 294 strTable.stringsDo(stat); 295 stat.print(); 296 } 297 }