1 /*
2 * Copyright (c) 2003, 2018, 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.epsilon.*;
29 import sun.jvm.hotspot.gc.g1.*;
30 import sun.jvm.hotspot.gc.parallel.*;
31 import sun.jvm.hotspot.gc.serial.*;
32 import sun.jvm.hotspot.gc.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 @Override
54 public String getName() {
55 return "heapSummary";
56 }
57
58 public void run() {
59 CollectedHeap heap = VM.getVM().getUniverse().heap();
60 VM.Flag[] flags = VM.getVM().getCommandLineFlags();
61 Map flagMap = new HashMap();
62 if (flags == null) {
63 System.out.println("WARNING: command line flags are not available");
64 } else {
65 for (int f = 0; f < flags.length; f++) {
66 flagMap.put(flags[f].getName(), flags[f]);
67 }
68 }
69
70 System.out.println();
71 printGCAlgorithm(flagMap);
72 System.out.println();
73 System.out.println("Heap Configuration:");
74 printValue("MinHeapFreeRatio = ", getFlagValue("MinHeapFreeRatio", flagMap));
75 printValue("MaxHeapFreeRatio = ", getFlagValue("MaxHeapFreeRatio", flagMap));
76 printValMB("MaxHeapSize = ", getFlagValue("MaxHeapSize", flagMap));
77 printValMB("NewSize = ", getFlagValue("NewSize", flagMap));
78 printValMB("MaxNewSize = ", getFlagValue("MaxNewSize", flagMap));
79 printValMB("OldSize = ", getFlagValue("OldSize", flagMap));
80 printValue("NewRatio = ", getFlagValue("NewRatio", flagMap));
81 printValue("SurvivorRatio = ", getFlagValue("SurvivorRatio", flagMap));
82 printValMB("MetaspaceSize = ", getFlagValue("MetaspaceSize", flagMap));
83 printValMB("CompressedClassSpaceSize = ", getFlagValue("CompressedClassSpaceSize", flagMap));
84 printValMB("MaxMetaspaceSize = ", getFlagValue("MaxMetaspaceSize", flagMap));
85 printValMB("G1HeapRegionSize = ", HeapRegion.grainBytes());
86
87 System.out.println();
88 System.out.println("Heap Usage:");
89
90 if (heap instanceof GenCollectedHeap) {
91 GenCollectedHeap genHeap = (GenCollectedHeap) heap;
92 for (int n = 0; n < genHeap.nGens(); n++) {
93 Generation gen = genHeap.getGen(n);
94 if (gen instanceof DefNewGeneration) {
95 System.out.println("New Generation (Eden + 1 Survivor Space):");
96 printGen(gen);
97
98 ContiguousSpace eden = ((DefNewGeneration)gen).eden();
99 System.out.println("Eden Space:");
100 printSpace(eden);
101
102 ContiguousSpace from = ((DefNewGeneration)gen).from();
103 System.out.println("From Space:");
104 printSpace(from);
105
106 ContiguousSpace to = ((DefNewGeneration)gen).to();
107 System.out.println("To Space:");
108 printSpace(to);
109 } else {
110 System.out.println(gen.name() + ":");
111 printGen(gen);
112 }
113 }
114 } else if (heap instanceof G1CollectedHeap) {
115 printG1HeapSummary((G1CollectedHeap)heap);
116 } else if (heap instanceof ParallelScavengeHeap) {
117 ParallelScavengeHeap psh = (ParallelScavengeHeap) heap;
118 PSYoungGen youngGen = psh.youngGen();
119 printPSYoungGen(youngGen);
120
121 PSOldGen oldGen = psh.oldGen();
122 long oldFree = oldGen.capacity() - oldGen.used();
123 System.out.println("PS Old Generation");
124 printValMB("capacity = ", oldGen.capacity());
125 printValMB("used = ", oldGen.used());
126 printValMB("free = ", oldFree);
127 System.out.println(alignment + (double)oldGen.used() * 100.0 / oldGen.capacity() + "% used");
128 } else if (heap instanceof EpsilonHeap) {
129 EpsilonHeap eh = (EpsilonHeap) heap;
130 printSpace(eh.space());
131 } else {
132 throw new RuntimeException("unknown CollectedHeap type : " + heap.getClass());
133 }
134
135 System.out.println();
136 printInternStringStatistics();
137 }
138
139 // Helper methods
140
141 private void printGCAlgorithm(Map flagMap) {
142 long l = getFlagValue("UseTLAB", flagMap);
143 if (l == 1L) {
144 System.out.println("using thread-local object allocation.");
145 }
146
147 l = getFlagValue("UseConcMarkSweepGC", flagMap);
148 if (l == 1L) {
149 System.out.println("Concurrent Mark-Sweep GC");
150 return;
151 }
152
153 l = getFlagValue("UseParallelGC", flagMap);
154 if (l == 1L) {
155 System.out.print("Parallel GC ");
156 l = getFlagValue("ParallelGCThreads", flagMap);
157 System.out.println("with " + l + " thread(s)");
158 return;
159 }
160
161 l = getFlagValue("UseG1GC", flagMap);
162 if (l == 1L) {
163 System.out.print("Garbage-First (G1) GC ");
164 l = getFlagValue("ParallelGCThreads", flagMap);
165 System.out.println("with " + l + " thread(s)");
166 return;
167 }
168
169 l = getFlagValue("UseEpsilonGC", flagMap);
170 if (l == 1L) {
171 System.out.println("Epsilon (no-op) GC");
172 return;
173 }
174
175 System.out.println("Mark Sweep Compact GC");
176 }
177
178 private void printPSYoungGen(PSYoungGen youngGen) {
179 System.out.println("PS Young Generation");
180 MutableSpace eden = youngGen.edenSpace();
181 System.out.println("Eden Space:");
182 printMutableSpace(eden);
183 MutableSpace from = youngGen.fromSpace();
184 System.out.println("From Space:");
185 printMutableSpace(from);
186 MutableSpace to = youngGen.toSpace();
187 System.out.println("To Space:");
188 printMutableSpace(to);
189 }
190
191 private void printMutableSpace(MutableSpace space) {
192 printValMB("capacity = ", space.capacity());
193 printValMB("used = ", space.used());
194 long free = space.capacity() - space.used();
195 printValMB("free = ", free);
196 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
197 }
198
199 private static String alignment = " ";
200
201 private void printGen(Generation gen) {
202 printValMB("capacity = ", gen.capacity());
203 printValMB("used = ", gen.used());
204 printValMB("free = ", gen.free());
205 System.out.println(alignment + (double)gen.used() * 100.0 / gen.capacity() + "% used");
206 }
207
208 private void printSpace(ContiguousSpace space) {
209 printValMB("capacity = ", space.capacity());
210 printValMB("used = ", space.used());
211 printValMB("free = ", space.free());
212 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
213 }
214
215 public void printG1HeapSummary(G1CollectedHeap g1h) {
216 G1MonitoringSupport g1mm = g1h.g1mm();
217 long edenRegionNum = g1mm.edenRegionNum();
218 long survivorRegionNum = g1mm.survivorRegionNum();
219 HeapRegionSetBase oldSet = g1h.oldSet();
220 HeapRegionSetBase humongousSet = g1h.humongousSet();
221 long oldRegionNum = oldSet.length() + humongousSet.length();
222 printG1Space("G1 Heap:", g1h.n_regions(),
223 g1h.used(), g1h.capacity());
224 System.out.println("G1 Young Generation:");
225 printG1Space("Eden Space:", edenRegionNum,
226 g1mm.edenUsed(), g1mm.edenCommitted());
227 printG1Space("Survivor Space:", survivorRegionNum,
228 g1mm.survivorUsed(), g1mm.survivorCommitted());
229 printG1Space("G1 Old Generation:", oldRegionNum,
230 g1mm.oldUsed(), g1mm.oldCommitted());
231 }
232
233 private void printG1Space(String spaceName, long regionNum,
234 long used, long capacity) {
235 long free = capacity - used;
236 System.out.println(spaceName);
237 printValue("regions = ", regionNum);
238 printValMB("capacity = ", capacity);
239 printValMB("used = ", used);
240 printValMB("free = ", free);
241 double occPerc = (capacity > 0) ? (double) used * 100.0 / capacity : 0.0;
242 System.out.println(alignment + occPerc + "% used");
243 }
244
245 private static final double FACTOR = 1024*1024;
246 private void printValMB(String title, long value) {
247 if (value < 0) {
248 System.out.println(alignment + title + (value >>> 20) + " MB");
249 } else {
250 double mb = value/FACTOR;
251 System.out.println(alignment + title + value + " (" + mb + "MB)");
252 }
253 }
254
255 private void printValue(String title, long value) {
256 System.out.println(alignment + title + value);
257 }
258
259 private long getFlagValue(String name, Map flagMap) {
260 VM.Flag f = (VM.Flag) flagMap.get(name);
261 if (f != null) {
262 if (f.isBool()) {
263 return f.getBool()? 1L : 0L;
264 } else {
265 return Long.parseLong(f.getValue());
266 }
267 } else {
268 return -1;
269 }
270 }
271
272 private void printInternStringStatistics() {
273 class StringStat implements StringTable.StringVisitor {
274 private int count;
275 private long size;
276 private OopField stringValueField;
277
278 StringStat() {
279 VM vm = VM.getVM();
280 SystemDictionary sysDict = vm.getSystemDictionary();
281 InstanceKlass strKlass = sysDict.getStringKlass();
282 // String has a field named 'value' of type 'byte[]'.
283 stringValueField = (OopField) strKlass.findField("value", "[B");
284 }
285
286 private long stringSize(Instance instance) {
287 // We include String content in size calculation.
288 return instance.getObjectSize() +
289 stringValueField.getValue(instance).getObjectSize();
290 }
291
292 public void visit(Instance str) {
293 count++;
294 size += stringSize(str);
295 }
296
297 public void print() {
298 System.out.println(count +
299 " interned Strings occupying " + size + " bytes.");
300 }
301 }
302
303 StringStat stat = new StringStat();
304 StringTable strTable = VM.getVM().getStringTable();
305 strTable.stringsDo(stat);
306 stat.print();
307 }
308 }