1 /*
2 * Copyright (c) 2003, 2011, 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("PermSize = ", getFlagValue("PermSize", flagMap));
69 printValMB("MaxPermSize = ", getFlagValue("MaxPermSize", flagMap));
70
71 System.out.println();
72 System.out.println("Heap Usage:");
73
74 if (heap instanceof SharedHeap) {
75 SharedHeap sharedHeap = (SharedHeap) heap;
76 if (sharedHeap instanceof GenCollectedHeap) {
77 GenCollectedHeap genHeap = (GenCollectedHeap) sharedHeap;
78 for (int n = 0; n < genHeap.nGens(); n++) {
79 Generation gen = genHeap.getGen(n);
80 if (gen instanceof sun.jvm.hotspot.memory.DefNewGeneration) {
81 System.out.println("New Generation (Eden + 1 Survivor Space):");
82 printGen(gen);
83
84 ContiguousSpace eden = ((DefNewGeneration)gen).eden();
85 System.out.println("Eden Space:");
86 printSpace(eden);
87
88 ContiguousSpace from = ((DefNewGeneration)gen).from();
89 System.out.println("From Space:");
90 printSpace(from);
91
92 ContiguousSpace to = ((DefNewGeneration)gen).to();
93 System.out.println("To Space:");
94 printSpace(to);
95 } else {
96 System.out.println(gen.name() + ":");
97 printGen(gen);
98 }
99 }
100 } else if (sharedHeap instanceof G1CollectedHeap) {
101 G1CollectedHeap g1h = (G1CollectedHeap) sharedHeap;
102 G1MonitoringSupport g1mm = g1h.g1mm();
103 System.out.println("G1 Young Generation");
104 printG1Space("Eden Space:", g1mm.edenUsed(), g1mm.edenCommitted());
105 printG1Space("From Space:", g1mm.survivorUsed(), g1mm.survivorCommitted());
106 printG1Space("To Space:", 0, 0);
107 printG1Space("G1 Old Generation", g1mm.oldUsed(), g1mm.oldCommitted());
108 } else {
109 throw new RuntimeException("unknown SharedHeap type : " + heap.getClass());
110 }
111 // Perm generation shared by the above
112 Generation permGen = sharedHeap.permGen();
113 System.out.println("Perm Generation:");
114 printGen(permGen);
115 } else if (heap instanceof ParallelScavengeHeap) {
116 ParallelScavengeHeap psh = (ParallelScavengeHeap) heap;
117 PSYoungGen youngGen = psh.youngGen();
118 printPSYoungGen(youngGen);
119
120 PSOldGen oldGen = psh.oldGen();
121 long oldFree = oldGen.capacity() - oldGen.used();
122 System.out.println("PS Old Generation");
123 printValMB("capacity = ", oldGen.capacity());
124 printValMB("used = ", oldGen.used());
125 printValMB("free = ", oldFree);
126 System.out.println(alignment + (double)oldGen.used() * 100.0 / oldGen.capacity() + "% used");
127
128 PSPermGen permGen = psh.permGen();
129 long permFree = permGen.capacity() - permGen.used();
130 System.out.println("PS Perm Generation");
131 printValMB("capacity = ", permGen.capacity());
132 printValMB("used = ", permGen.used());
133 printValMB("free = ", permFree);
134 System.out.println(alignment + (double)permGen.used() * 100.0 / permGen.capacity() + "% used");
135 } else {
136 throw new RuntimeException("unknown CollectedHeap type : " + heap.getClass());
137 }
138
139 System.out.println();
140 printInternStringStatistics();
141 }
142
143 // Helper methods
144
145 private void printGCAlgorithm(Map flagMap) {
146 // print about new generation
147 long l = getFlagValue("UseParNewGC", flagMap);
148 if (l == 1L) {
149 System.out.println("using parallel threads in the new generation.");
150 }
151
152 l = getFlagValue("UseTLAB", flagMap);
153 if (l == 1L) {
154 System.out.println("using thread-local object allocation.");
155 }
156
157 l = getFlagValue("UseConcMarkSweepGC", flagMap);
158 if (l == 1L) {
159 System.out.println("Concurrent Mark-Sweep GC");
160 return;
161 }
162
163 l = getFlagValue("UseParallelGC", flagMap);
164 if (l == 1L) {
165 System.out.print("Parallel GC ");
166 l = getFlagValue("ParallelGCThreads", flagMap);
167 System.out.println("with " + l + " thread(s)");
168 return;
169 }
170
171 l = getFlagValue("UseG1GC", flagMap);
172 if (l == 1L) {
173 System.out.print("Garbage-First (G1) GC ");
174 l = getFlagValue("ParallelGCThreads", flagMap);
175 System.out.println("with " + l + " thread(s)");
176 return;
177 }
178
179 System.out.println("Mark Sweep Compact GC");
180 }
181
182 private void printPSYoungGen(PSYoungGen youngGen) {
183 System.out.println("PS Young Generation");
184 MutableSpace eden = youngGen.edenSpace();
185 System.out.println("Eden Space:");
186 printMutableSpace(eden);
187 MutableSpace from = youngGen.fromSpace();
188 System.out.println("From Space:");
189 printMutableSpace(from);
190 MutableSpace to = youngGen.toSpace();
191 System.out.println("To Space:");
192 printMutableSpace(to);
193 }
194
195 private void printMutableSpace(MutableSpace space) {
196 printValMB("capacity = ", space.capacity());
197 printValMB("used = ", space.used());
198 long free = space.capacity() - space.used();
199 printValMB("free = ", free);
200 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
201 }
202
203 private static String alignment = " ";
204
205 private void printGen(Generation gen) {
206 printValMB("capacity = ", gen.capacity());
207 printValMB("used = ", gen.used());
208 printValMB("free = ", gen.free());
209 System.out.println(alignment + (double)gen.used() * 100.0 / gen.capacity() + "% used");
210 }
211
212 private void printSpace(ContiguousSpace space) {
213 printValMB("capacity = ", space.capacity());
214 printValMB("used = ", space.used());
215 printValMB("free = ", space.free());
216 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
217 }
218
219 private void printG1Space(String spaceName, long used, long capacity) {
220 long free = capacity - used;
221 System.out.println(spaceName);
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 }