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.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 @Override
53 public String getName() {
54 return "heapSummary";
55 }
56
57 public void run() {
58 CollectedHeap heap = VM.getVM().getUniverse().heap();
59 VM.Flag[] flags = VM.getVM().getCommandLineFlags();
60 Map flagMap = new HashMap();
61 if (flags == null) {
62 System.out.println("WARNING: command line flags are not available");
63 } else {
64 for (int f = 0; f < flags.length; f++) {
65 flagMap.put(flags[f].getName(), flags[f]);
66 }
67 }
68
69 System.out.println();
70 printGCAlgorithm(flagMap);
71 System.out.println();
72 System.out.println("Heap Configuration:");
73 printValue("MinHeapFreeRatio = ", getFlagValue("MinHeapFreeRatio", flagMap));
74 printValue("MaxHeapFreeRatio = ", getFlagValue("MaxHeapFreeRatio", flagMap));
75 printValMB("MaxHeapSize = ", getFlagValue("MaxHeapSize", flagMap));
76 printValMB("NewSize = ", getFlagValue("NewSize", flagMap));
77 printValMB("MaxNewSize = ", getFlagValue("MaxNewSize", flagMap));
78 printValMB("OldSize = ", getFlagValue("OldSize", flagMap));
79 printValue("NewRatio = ", getFlagValue("NewRatio", flagMap));
80 printValue("SurvivorRatio = ", getFlagValue("SurvivorRatio", flagMap));
81 printValMB("MetaspaceSize = ", getFlagValue("MetaspaceSize", flagMap));
82 printValMB("CompressedClassSpaceSize = ", getFlagValue("CompressedClassSpaceSize", flagMap));
83 printValMB("MaxMetaspaceSize = ", getFlagValue("MaxMetaspaceSize", flagMap));
84 printValMB("G1HeapRegionSize = ", HeapRegion.grainBytes());
85
86 System.out.println();
87 System.out.println("Heap Usage:");
88
89 if (heap instanceof GenCollectedHeap) {
90 GenCollectedHeap genHeap = (GenCollectedHeap) heap;
91 for (int n = 0; n < genHeap.nGens(); n++) {
92 Generation gen = genHeap.getGen(n);
93 if (gen instanceof DefNewGeneration) {
94 System.out.println("New Generation (Eden + 1 Survivor Space):");
95 printGen(gen);
96
97 ContiguousSpace eden = ((DefNewGeneration)gen).eden();
98 System.out.println("Eden Space:");
99 printSpace(eden);
100
101 ContiguousSpace from = ((DefNewGeneration)gen).from();
102 System.out.println("From Space:");
103 printSpace(from);
104
105 ContiguousSpace to = ((DefNewGeneration)gen).to();
106 System.out.println("To Space:");
107 printSpace(to);
108 } else {
109 System.out.println(gen.name() + ":");
110 printGen(gen);
111 }
112 }
113 } else if (heap instanceof G1CollectedHeap) {
114 printG1HeapSummary((G1CollectedHeap)heap);
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 } else {
128 throw new RuntimeException("unknown CollectedHeap type : " + heap.getClass());
129 }
130
131 System.out.println();
132 printInternStringStatistics();
133 }
134
135 // Helper methods
136
137 private void printGCAlgorithm(Map flagMap) {
138 long l = getFlagValue("UseTLAB", flagMap);
139 if (l == 1L) {
140 System.out.println("using thread-local object allocation.");
141 }
142
143 l = getFlagValue("UseConcMarkSweepGC", flagMap);
144 if (l == 1L) {
145 System.out.println("Concurrent Mark-Sweep GC");
146 return;
147 }
148
149 l = getFlagValue("UseParallelGC", flagMap);
150 if (l == 1L) {
151 System.out.print("Parallel GC ");
152 l = getFlagValue("ParallelGCThreads", flagMap);
153 System.out.println("with " + l + " thread(s)");
154 return;
155 }
156
157 l = getFlagValue("UseG1GC", flagMap);
158 if (l == 1L) {
159 System.out.print("Garbage-First (G1) GC ");
160 l = getFlagValue("ParallelGCThreads", flagMap);
161 System.out.println("with " + l + " thread(s)");
162 return;
163 }
164
165 System.out.println("Mark Sweep Compact GC");
166 }
167
168 private void printPSYoungGen(PSYoungGen youngGen) {
169 System.out.println("PS Young Generation");
170 MutableSpace eden = youngGen.edenSpace();
171 System.out.println("Eden Space:");
172 printMutableSpace(eden);
173 MutableSpace from = youngGen.fromSpace();
174 System.out.println("From Space:");
175 printMutableSpace(from);
176 MutableSpace to = youngGen.toSpace();
177 System.out.println("To Space:");
178 printMutableSpace(to);
179 }
180
181 private void printMutableSpace(MutableSpace space) {
182 printValMB("capacity = ", space.capacity());
183 printValMB("used = ", space.used());
184 long free = space.capacity() - space.used();
185 printValMB("free = ", free);
186 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
187 }
188
189 private static String alignment = " ";
190
191 private void printGen(Generation gen) {
192 printValMB("capacity = ", gen.capacity());
193 printValMB("used = ", gen.used());
194 printValMB("free = ", gen.free());
195 System.out.println(alignment + (double)gen.used() * 100.0 / gen.capacity() + "% used");
196 }
197
198 private void printSpace(ContiguousSpace space) {
199 printValMB("capacity = ", space.capacity());
200 printValMB("used = ", space.used());
201 printValMB("free = ", space.free());
202 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
203 }
204
205 public void printG1HeapSummary(G1CollectedHeap g1h) {
206 G1MonitoringSupport g1mm = g1h.g1mm();
207 long edenRegionNum = g1mm.edenRegionNum();
208 long survivorRegionNum = g1mm.survivorRegionNum();
209 HeapRegionSetBase oldSet = g1h.oldSet();
210 HeapRegionSetBase humongousSet = g1h.humongousSet();
211 long oldRegionNum = oldSet.length() + humongousSet.length();
212 printG1Space("G1 Heap:", g1h.n_regions(),
213 g1h.used(), g1h.capacity());
214 System.out.println("G1 Young Generation:");
215 printG1Space("Eden Space:", edenRegionNum,
216 g1mm.edenUsed(), g1mm.edenCommitted());
217 printG1Space("Survivor Space:", survivorRegionNum,
218 g1mm.survivorUsed(), g1mm.survivorCommitted());
219 printG1Space("G1 Old Generation:", oldRegionNum,
220 g1mm.oldUsed(), g1mm.oldCommitted());
221 }
222
223 private void printG1Space(String spaceName, long regionNum,
224 long used, long capacity) {
225 long free = capacity - used;
226 System.out.println(spaceName);
227 printValue("regions = ", regionNum);
228 printValMB("capacity = ", capacity);
229 printValMB("used = ", used);
230 printValMB("free = ", free);
231 double occPerc = (capacity > 0) ? (double) used * 100.0 / capacity : 0.0;
232 System.out.println(alignment + occPerc + "% used");
233 }
234
235 private static final double FACTOR = 1024*1024;
236 private void printValMB(String title, long value) {
237 if (value < 0) {
238 System.out.println(alignment + title + (value >>> 20) + " MB");
239 } else {
240 double mb = value/FACTOR;
241 System.out.println(alignment + title + value + " (" + mb + "MB)");
242 }
243 }
244
245 private void printValue(String title, long value) {
246 System.out.println(alignment + title + value);
247 }
248
249 private long getFlagValue(String name, Map flagMap) {
250 VM.Flag f = (VM.Flag) flagMap.get(name);
251 if (f != null) {
252 if (f.isBool()) {
253 return f.getBool()? 1L : 0L;
254 } else {
255 return Long.parseLong(f.getValue());
256 }
257 } else {
258 return -1;
259 }
260 }
261
262 private void printInternStringStatistics() {
263 class StringStat implements StringTable.StringVisitor {
264 private int count;
265 private long size;
266 private OopField stringValueField;
267
268 StringStat() {
269 VM vm = VM.getVM();
270 SystemDictionary sysDict = vm.getSystemDictionary();
271 InstanceKlass strKlass = sysDict.getStringKlass();
272 // String has a field named 'value' of type 'byte[]'.
273 stringValueField = (OopField) strKlass.findField("value", "[B");
274 }
275
276 private long stringSize(Instance instance) {
277 // We include String content in size calculation.
278 return instance.getObjectSize() +
279 stringValueField.getValue(instance).getObjectSize();
280 }
281
282 public void visit(Instance str) {
283 count++;
284 size += stringSize(str);
285 }
286
287 public void print() {
288 System.out.println(count +
289 " interned Strings occupying " + size + " bytes.");
290 }
291 }
292
293 StringStat stat = new StringStat();
294 StringTable strTable = VM.getVM().getStringTable();
295 strTable.stringsDo(stat);
296 stat.print();
297 }
298 }