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 }
133
134 // Helper methods
135
136 private void printGCAlgorithm(Map flagMap) {
137 long l = getFlagValue("UseTLAB", flagMap);
138 if (l == 1L) {
139 System.out.println("using thread-local object allocation.");
140 }
141
142 l = getFlagValue("UseConcMarkSweepGC", flagMap);
143 if (l == 1L) {
144 System.out.println("Concurrent Mark-Sweep GC");
145 return;
146 }
147
148 l = getFlagValue("UseParallelGC", flagMap);
149 if (l == 1L) {
150 System.out.print("Parallel GC ");
151 l = getFlagValue("ParallelGCThreads", flagMap);
152 System.out.println("with " + l + " thread(s)");
153 return;
154 }
155
156 l = getFlagValue("UseG1GC", flagMap);
157 if (l == 1L) {
158 System.out.print("Garbage-First (G1) GC ");
159 l = getFlagValue("ParallelGCThreads", flagMap);
160 System.out.println("with " + l + " thread(s)");
161 return;
162 }
163
164 System.out.println("Mark Sweep Compact GC");
165 }
166
167 private void printPSYoungGen(PSYoungGen youngGen) {
168 System.out.println("PS Young Generation");
169 MutableSpace eden = youngGen.edenSpace();
170 System.out.println("Eden Space:");
171 printMutableSpace(eden);
172 MutableSpace from = youngGen.fromSpace();
173 System.out.println("From Space:");
174 printMutableSpace(from);
175 MutableSpace to = youngGen.toSpace();
176 System.out.println("To Space:");
177 printMutableSpace(to);
178 }
179
180 private void printMutableSpace(MutableSpace space) {
181 printValMB("capacity = ", space.capacity());
182 printValMB("used = ", space.used());
183 long free = space.capacity() - space.used();
184 printValMB("free = ", free);
185 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
186 }
187
188 private static String alignment = " ";
189
190 private void printGen(Generation gen) {
191 printValMB("capacity = ", gen.capacity());
192 printValMB("used = ", gen.used());
193 printValMB("free = ", gen.free());
194 System.out.println(alignment + (double)gen.used() * 100.0 / gen.capacity() + "% used");
195 }
196
197 private void printSpace(ContiguousSpace space) {
198 printValMB("capacity = ", space.capacity());
199 printValMB("used = ", space.used());
200 printValMB("free = ", space.free());
201 System.out.println(alignment + (double)space.used() * 100.0 / space.capacity() + "% used");
202 }
203
204 public void printG1HeapSummary(G1CollectedHeap g1h) {
205 G1MonitoringSupport g1mm = g1h.g1mm();
206 long edenRegionNum = g1mm.edenRegionNum();
207 long survivorRegionNum = g1mm.survivorRegionNum();
208 HeapRegionSetBase oldSet = g1h.oldSet();
209 HeapRegionSetBase humongousSet = g1h.humongousSet();
210 long oldRegionNum = oldSet.length() + humongousSet.length();
211 printG1Space("G1 Heap:", g1h.n_regions(),
212 g1h.used(), g1h.capacity());
213 System.out.println("G1 Young Generation:");
214 printG1Space("Eden Space:", edenRegionNum,
215 g1mm.edenUsed(), g1mm.edenCommitted());
216 printG1Space("Survivor Space:", survivorRegionNum,
217 g1mm.survivorUsed(), g1mm.survivorCommitted());
218 printG1Space("G1 Old Generation:", oldRegionNum,
219 g1mm.oldUsed(), g1mm.oldCommitted());
220 }
221
222 private void printG1Space(String spaceName, long regionNum,
223 long used, long capacity) {
224 long free = capacity - used;
225 System.out.println(spaceName);
226 printValue("regions = ", regionNum);
227 printValMB("capacity = ", capacity);
228 printValMB("used = ", used);
229 printValMB("free = ", free);
230 double occPerc = (capacity > 0) ? (double) used * 100.0 / capacity : 0.0;
231 System.out.println(alignment + occPerc + "% used");
232 }
233
234 private static final double FACTOR = 1024*1024;
235 private void printValMB(String title, long value) {
236 if (value < 0) {
237 System.out.println(alignment + title + (value >>> 20) + " MB");
238 } else {
239 double mb = value/FACTOR;
240 System.out.println(alignment + title + value + " (" + mb + "MB)");
241 }
242 }
243
244 private void printValue(String title, long value) {
245 System.out.println(alignment + title + value);
246 }
247
248 private long getFlagValue(String name, Map flagMap) {
249 VM.Flag f = (VM.Flag) flagMap.get(name);
250 if (f != null) {
251 if (f.isBool()) {
252 return f.getBool()? 1L : 0L;
253 } else {
254 return Long.parseLong(f.getValue());
255 }
256 } else {
257 return -1;
258 }
259 }
260 }