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.shenandoah.*;
31 import sun.jvm.hotspot.gc_implementation.parallelScavenge.*;
32 import sun.jvm.hotspot.gc_implementation.shared.*;
33 import sun.jvm.hotspot.debugger.JVMDebugger;
34 import sun.jvm.hotspot.memory.*;
35 import sun.jvm.hotspot.oops.*;
36 import sun.jvm.hotspot.runtime.*;
37
38 public class HeapSummary extends Tool {
39
40 public HeapSummary() {
41 super();
42 }
43
44 public HeapSummary(JVMDebugger d) {
45 super(d);
46 }
47
48 public static void main(String[] args) {
49 HeapSummary hs = new HeapSummary();
50 hs.execute(args);
51 }
52
53 public void run() {
54 CollectedHeap heap = VM.getVM().getUniverse().heap();
55 VM.Flag[] flags = VM.getVM().getCommandLineFlags();
56 Map flagMap = new HashMap();
57 if (flags == null) {
58 System.out.println("WARNING: command line flags are not available");
59 } else {
60 for (int f = 0; f < flags.length; f++) {
61 flagMap.put(flags[f].getName(), flags[f]);
62 }
63 }
64
65 System.out.println();
66 printGCAlgorithm(flagMap);
67 System.out.println();
68 System.out.println("Heap Configuration:");
69 printValue("MinHeapFreeRatio = ", getFlagValue("MinHeapFreeRatio", flagMap));
70 printValue("MaxHeapFreeRatio = ", getFlagValue("MaxHeapFreeRatio", flagMap));
71 printValMB("MaxHeapSize = ", getFlagValue("MaxHeapSize", flagMap));
72 printValMB("NewSize = ", getFlagValue("NewSize", flagMap));
73 printValMB("MaxNewSize = ", getFlagValue("MaxNewSize", flagMap));
74 printValMB("OldSize = ", getFlagValue("OldSize", flagMap));
75 printValue("NewRatio = ", getFlagValue("NewRatio", flagMap));
76 printValue("SurvivorRatio = ", getFlagValue("SurvivorRatio", flagMap));
77 printValMB("MetaspaceSize = ", getFlagValue("MetaspaceSize", flagMap));
78 printValMB("CompressedClassSpaceSize = ", getFlagValue("CompressedClassSpaceSize", flagMap));
79 printValMB("MaxMetaspaceSize = ", getFlagValue("MaxMetaspaceSize", flagMap));
80 if (heap instanceof ShenandoahHeap) {
81 printValMB("ShenandoahRegionSize = ", ShenandoahHeapRegion.regionSizeBytes());
82 } else {
83 printValMB("G1HeapRegionSize = ", HeapRegion.grainBytes());
84 }
85
86 System.out.println();
87 System.out.println("Heap Usage:");
88
89 if (heap instanceof SharedHeap) {
90 SharedHeap sharedHeap = (SharedHeap) heap;
91 if (sharedHeap instanceof GenCollectedHeap) {
92 GenCollectedHeap genHeap = (GenCollectedHeap) sharedHeap;
93 for (int n = 0; n < genHeap.nGens(); n++) {
94 Generation gen = genHeap.getGen(n);
95 if (gen instanceof sun.jvm.hotspot.memory.DefNewGeneration) {
96 System.out.println("New Generation (Eden + 1 Survivor Space):");
97 printGen(gen);
98
99 ContiguousSpace eden = ((DefNewGeneration)gen).eden();
100 System.out.println("Eden Space:");
101 printSpace(eden);
102
103 ContiguousSpace from = ((DefNewGeneration)gen).from();
104 System.out.println("From Space:");
105 printSpace(from);
106
107 ContiguousSpace to = ((DefNewGeneration)gen).to();
108 System.out.println("To Space:");
109 printSpace(to);
110 } else {
111 System.out.println(gen.name() + ":");
112 printGen(gen);
113 }
114 }
115 } else if (sharedHeap instanceof G1CollectedHeap) {
116 G1CollectedHeap g1h = (G1CollectedHeap) sharedHeap;
117 G1MonitoringSupport g1mm = g1h.g1mm();
118 long edenRegionNum = g1mm.edenRegionNum();
119 long survivorRegionNum = g1mm.survivorRegionNum();
120 HeapRegionSetBase oldSet = g1h.oldSet();
121 HeapRegionSetBase humongousSet = g1h.humongousSet();
122 long oldRegionNum = oldSet.count().length()
123 + humongousSet.count().capacity() / HeapRegion.grainBytes();
124 printG1Space("G1 Heap:", g1h.n_regions(),
125 g1h.used(), g1h.capacity());
126 System.out.println("G1 Young Generation:");
127 printG1Space("Eden Space:", edenRegionNum,
128 g1mm.edenUsed(), g1mm.edenCommitted());
129 printG1Space("Survivor Space:", survivorRegionNum,
130 g1mm.survivorUsed(), g1mm.survivorCommitted());
131 printG1Space("G1 Old Generation:", oldRegionNum,
132 g1mm.oldUsed(), g1mm.oldCommitted());
133 } else {
134 throw new RuntimeException("unknown SharedHeap type : " + heap.getClass());
135 }
136 } else if (heap instanceof ParallelScavengeHeap) {
137 ParallelScavengeHeap psh = (ParallelScavengeHeap) heap;
138 PSYoungGen youngGen = psh.youngGen();
139 printPSYoungGen(youngGen);
140
141 PSOldGen oldGen = psh.oldGen();
142 long oldFree = oldGen.capacity() - oldGen.used();
143 System.out.println("PS Old Generation");
144 printValMB("capacity = ", oldGen.capacity());
145 printValMB("used = ", oldGen.used());
146 printValMB("free = ", oldFree);
147 System.out.println(alignment + (double)oldGen.used() * 100.0 / oldGen.capacity() + "% used");
148 } else if (heap instanceof ShenandoahHeap) {
149 ShenandoahHeap sh = (ShenandoahHeap) heap;
150 long num_regions = sh.numOfRegions();
151 System.out.println("Shenandoah Heap:");
152 System.out.println(" regions = " + num_regions);
153 printValMB("capacity = ", num_regions * ShenandoahHeapRegion.regionSizeBytes());
154 printValMB("used = ", sh.used());
155 printValMB("committed = ", sh.committed());
156 } else {
157 throw new RuntimeException("unknown CollectedHeap type : " + heap.getClass());
158 }
159
160 System.out.println();
161 printInternStringStatistics();
162 }
163
164 // Helper methods
165
166 private void printGCAlgorithm(Map flagMap) {
167 // print about new generation
168 long l = getFlagValue("UseParNewGC", flagMap);
169 if (l == 1L) {
170 System.out.println("using parallel threads in the new generation.");
171 }
172
173 l = getFlagValue("UseTLAB", flagMap);
174 if (l == 1L) {
175 System.out.println("using thread-local object allocation.");
176 }
177
178 l = getFlagValue("UseConcMarkSweepGC", flagMap);
179 if (l == 1L) {
180 System.out.println("Concurrent Mark-Sweep GC");
181 return;
182 }
183
184 l = getFlagValue("UseParallelGC", flagMap);
185 if (l == 1L) {
186 System.out.print("Parallel GC ");
187 l = getFlagValue("ParallelGCThreads", flagMap);
188 System.out.println("with " + l + " thread(s)");
189 return;
190 }
191
192 l = getFlagValue("UseG1GC", flagMap);
193 if (l == 1L) {
194 System.out.print("Garbage-First (G1) GC ");
195 l = getFlagValue("ParallelGCThreads", flagMap);
196 System.out.println("with " + l + " thread(s)");
197 return;
198 }
199
200 l = getFlagValue("UseShenandoahGC", flagMap);
201 if (l == 1L) {
202 System.out.print("Shenandoah GC ");
203 l = getFlagValue("ParallelGCThreads", flagMap);
204 System.out.println("with " + l + " thread(s)");
205 return;
206 }
207
208 System.out.println("Mark Sweep Compact GC");
209 }
210
211 private void printPSYoungGen(PSYoungGen youngGen) {
212 System.out.println("PS Young Generation");
213 MutableSpace eden = youngGen.edenSpace();
214 System.out.println("Eden Space:");
215 printMutableSpace(eden);
216 MutableSpace from = youngGen.fromSpace();
217 System.out.println("From Space:");
218 printMutableSpace(from);
219 MutableSpace to = youngGen.toSpace();
220 System.out.println("To Space:");
221 printMutableSpace(to);
222 }
223
224 private void printMutableSpace(MutableSpace space) {
225 printValMB("capacity = ", space.capacity());
226 printValMB("used = ", space.used());
227 long free = space.capacity() - space.used();
228 printValMB("free = ", free);
229 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
230 }
231
232 private static String alignment = " ";
233
234 private void printGen(Generation gen) {
235 printValMB("capacity = ", gen.capacity());
236 printValMB("used = ", gen.used());
237 printValMB("free = ", gen.free());
238 System.out.println(alignment + (double)gen.used() * 100.0 / gen.capacity() + "% used");
239 }
240
241 private void printSpace(ContiguousSpace space) {
242 printValMB("capacity = ", space.capacity());
243 printValMB("used = ", space.used());
244 printValMB("free = ", space.free());
245 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
246 }
247
248 private void printG1Space(String spaceName, long regionNum,
249 long used, long capacity) {
250 long free = capacity - used;
251 System.out.println(spaceName);
252 printValue("regions = ", regionNum);
253 printValMB("capacity = ", capacity);
254 printValMB("used = ", used);
255 printValMB("free = ", free);
256 double occPerc = (capacity > 0) ? (double) used * 100.0 / capacity : 0.0;
257 System.out.println(alignment + occPerc + "% used");
258 }
259
260 private static final double FACTOR = 1024*1024;
261 private void printValMB(String title, long value) {
262 if (value < 0) {
263 System.out.println(alignment + title + (value >>> 20) + " MB");
264 } else {
265 double mb = value/FACTOR;
266 System.out.println(alignment + title + value + " (" + mb + "MB)");
267 }
268 }
269
270 private void printValue(String title, long value) {
271 System.out.println(alignment + title + value);
272 }
273
274 private long getFlagValue(String name, Map flagMap) {
275 VM.Flag f = (VM.Flag) flagMap.get(name);
276 if (f != null) {
277 if (f.isBool()) {
278 return f.getBool()? 1L : 0L;
279 } else {
280 return Long.parseLong(f.getValue());
281 }
282 } else {
283 return -1;
284 }
285 }
286
287 private void printInternStringStatistics() {
288 class StringStat implements StringTable.StringVisitor {
289 private int count;
290 private long size;
291 private OopField stringValueField;
292
293 StringStat() {
294 VM vm = VM.getVM();
295 SystemDictionary sysDict = vm.getSystemDictionary();
296 InstanceKlass strKlass = sysDict.getStringKlass();
297 // String has a field named 'value' of type 'char[]'.
298 stringValueField = (OopField) strKlass.findField("value", "[C");
299 }
300
301 private long stringSize(Instance instance) {
302 // We include String content in size calculation.
303 return instance.getObjectSize() +
304 stringValueField.getValue(instance).getObjectSize();
305 }
306
307 public void visit(Instance str) {
308 count++;
309 size += stringSize(str);
310 }
311
312 public void print() {
313 System.out.println(count +
314 " interned Strings occupying " + size + " bytes.");
315 }
316 }
317
318 StringStat stat = new StringStat();
319 StringTable strTable = VM.getVM().getStringTable();
320 strTable.stringsDo(stat);
321 stat.print();
322 }
323 }