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 }