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