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.runtime.*;
34
35 public class HeapSummary extends Tool {
36
37 public static void main(String[] args) {
38 HeapSummary hs = new HeapSummary();
39 hs.start(args);
40 hs.stop();
41 }
42
43 public void run() {
44 CollectedHeap heap = VM.getVM().getUniverse().heap();
45 VM.Flag[] flags = VM.getVM().getCommandLineFlags();
46 Map flagMap = new HashMap();
47 if (flags == null) {
48 System.out.println("WARNING: command line flags are not available");
49 } else {
50 for (int f = 0; f < flags.length; f++) {
51 flagMap.put(flags[f].getName(), flags[f]);
52 }
53 }
54
55 System.out.println();
56 printGCAlgorithm(flagMap);
57 System.out.println();
58 System.out.println("Heap Configuration:");
59 printValue("MinHeapFreeRatio = ", getFlagValue("MinHeapFreeRatio", flagMap));
60 printValue("MaxHeapFreeRatio = ", getFlagValue("MaxHeapFreeRatio", flagMap));
61 printValMB("MaxHeapSize = ", getFlagValue("MaxHeapSize", flagMap));
62 printValMB("NewSize = ", getFlagValue("NewSize", flagMap));
63 printValMB("MaxNewSize = ", getFlagValue("MaxNewSize", flagMap));
64 printValMB("OldSize = ", getFlagValue("OldSize", flagMap));
65 printValue("NewRatio = ", getFlagValue("NewRatio", flagMap));
66 printValue("SurvivorRatio = ", getFlagValue("SurvivorRatio", flagMap));
67 printValMB("PermSize = ", getFlagValue("PermSize", flagMap));
68 printValMB("MaxPermSize = ", getFlagValue("MaxPermSize", flagMap));
69
70 System.out.println();
71 System.out.println("Heap Usage:");
72
73 if (heap instanceof SharedHeap) {
74 SharedHeap sharedHeap = (SharedHeap) heap;
75 if (sharedHeap instanceof GenCollectedHeap) {
76 GenCollectedHeap genHeap = (GenCollectedHeap) sharedHeap;
77 for (int n = 0; n < genHeap.nGens(); n++) {
78 Generation gen = genHeap.getGen(n);
79 if (gen instanceof sun.jvm.hotspot.memory.DefNewGeneration) {
80 System.out.println("New Generation (Eden + 1 Survivor Space):");
81 printGen(gen);
82
83 ContiguousSpace eden = ((DefNewGeneration)gen).eden();
84 System.out.println("Eden Space:");
85 printSpace(eden);
86
87 ContiguousSpace from = ((DefNewGeneration)gen).from();
88 System.out.println("From Space:");
89 printSpace(from);
90
91 ContiguousSpace to = ((DefNewGeneration)gen).to();
92 System.out.println("To Space:");
93 printSpace(to);
94 } else {
95 System.out.println(gen.name() + ":");
96 printGen(gen);
97 }
98 }
99 } else if (sharedHeap instanceof G1CollectedHeap) {
100 G1CollectedHeap g1h = (G1CollectedHeap) sharedHeap;
101 G1MonitoringSupport g1mm = g1h.g1mm();
102 System.out.println("G1 Young Generation");
103 printG1Space("Eden Space:", g1mm.edenUsed(), g1mm.edenCommitted());
104 printG1Space("From Space:", g1mm.survivorUsed(), g1mm.survivorCommitted());
105 printG1Space("To Space:", 0, 0);
106 printG1Space("G1 Old Generation", g1mm.oldUsed(), g1mm.oldCommitted());
107 } else {
108 throw new RuntimeException("unknown SharedHeap type : " + heap.getClass());
109 }
110 // Perm generation shared by the above
111 Generation permGen = sharedHeap.permGen();
112 System.out.println("Perm Generation:");
113 printGen(permGen);
114 } else if (heap instanceof ParallelScavengeHeap) {
115 ParallelScavengeHeap psh = (ParallelScavengeHeap) heap;
116 PSYoungGen youngGen = psh.youngGen();
117 printPSYoungGen(youngGen);
118
119 PSOldGen oldGen = psh.oldGen();
120 long oldFree = oldGen.capacity() - oldGen.used();
121 System.out.println("PS Old Generation");
122 printValMB("capacity = ", oldGen.capacity());
123 printValMB("used = ", oldGen.used());
124 printValMB("free = ", oldFree);
125 System.out.println(alignment + (double)oldGen.used() * 100.0 / oldGen.capacity() + "% used");
126
127 PSPermGen permGen = psh.permGen();
128 long permFree = permGen.capacity() - permGen.used();
129 System.out.println("PS Perm Generation");
130 printValMB("capacity = ", permGen.capacity());
131 printValMB("used = ", permGen.used());
132 printValMB("free = ", permFree);
133 System.out.println(alignment + (double)permGen.used() * 100.0 / permGen.capacity() + "% used");
134 } else {
135 throw new RuntimeException("unknown CollectedHeap type : " + heap.getClass());
136 }
137 }
138
139 // Helper methods
140
141 private void printGCAlgorithm(Map flagMap) {
142 // print about new generation
143 long l = getFlagValue("UseParNewGC", flagMap);
144 if (l == 1L) {
145 System.out.println("using parallel threads in the new generation.");
146 }
147
148 l = getFlagValue("UseTLAB", flagMap);
149 if (l == 1L) {
150 System.out.println("using thread-local object allocation.");
151 }
152
153 l = getFlagValue("UseConcMarkSweepGC", flagMap);
154 if (l == 1L) {
155 System.out.println("Concurrent Mark-Sweep GC");
156 return;
157 }
158
159 l = getFlagValue("UseParallelGC", flagMap);
160 if (l == 1L) {
161 System.out.print("Parallel GC ");
162 l = getFlagValue("ParallelGCThreads", flagMap);
163 System.out.println("with " + l + " thread(s)");
164 return;
165 }
166
167 l = getFlagValue("UseG1GC", flagMap);
168 if (l == 1L) {
169 System.out.print("Garbage-First (G1) GC ");
170 l = getFlagValue("ParallelGCThreads", flagMap);
171 System.out.println("with " + l + " thread(s)");
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 private void printG1Space(String spaceName, long used, long capacity) {
216 long free = capacity - used;
217 System.out.println(spaceName);
218 printValMB("capacity = ", capacity);
219 printValMB("used = ", used);
220 printValMB("free = ", free);
221 double occPerc = (capacity > 0) ? (double) used * 100.0 / capacity : 0.0;
222 System.out.println(alignment + occPerc + "% used");
223 }
224
225 private static final double FACTOR = 1024*1024;
226 private void printValMB(String title, long value) {
227 if (value < 0) {
228 System.out.println(alignment + title + (value >>> 20) + " MB");
229 } else {
230 double mb = value/FACTOR;
231 System.out.println(alignment + title + value + " (" + mb + "MB)");
232 }
233 }
234
235 private void printValue(String title, long value) {
236 System.out.println(alignment + title + value);
237 }
238
239 private long getFlagValue(String name, Map flagMap) {
240 VM.Flag f = (VM.Flag) flagMap.get(name);
241 if (f != null) {
242 if (f.isBool()) {
243 return f.getBool()? 1L : 0L;
244 } else {
245 return Long.parseLong(f.getValue());
246 }
247 } else {
248 return -1;
249 }
250 }
251 }