1 /*
2 * Copyright (c) 2014, 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 * @test
26 * @summary Stress test for malloc tracking
27 * @key nmt jcmd stress
28 * @library /test/lib
29 * @modules java.base/jdk.internal.misc
30 * java.management
31 * @build sun.hotspot.WhiteBox
32 * @ignore - This test is disabled since it will stress NMT and timeout during normal testing
33 * @run main ClassFileInstaller sun.hotspot.WhiteBox
34 * @run main/othervm/timeout=600 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocStressTest
35 */
36
37 import java.util.concurrent.atomic.AtomicInteger;
38 import java.util.ArrayList;
39 import java.util.List;
40 import java.util.Random;
41 import jdk.test.lib.process.ProcessTools;
42 import jdk.test.lib.process.OutputAnalyzer;
43 import sun.hotspot.WhiteBox;
44
45 public class MallocStressTest {
46 private static int K = 1024;
47
48 // The stress test runs in three phases:
49 // 1. alloc: A lot of malloc with fewer free, which simulates a burst memory allocation
50 // that is usually seen during startup or class loading.
51 // 2. pause: Pause the test to check accuracy of native memory tracking
52 // 3. release: Release all malloc'd memory and check native memory tracking result.
53 public enum TestPhase {
54 alloc,
55 pause,
56 release
57 };
58
59 static TestPhase phase = TestPhase.alloc;
60
61 // malloc'd memory
62 static ArrayList<MallocMemory> mallocd_memory = new ArrayList<MallocMemory>();
63 static long mallocd_total = 0;
64 static WhiteBox whiteBox;
65 static AtomicInteger pause_count = new AtomicInteger();
66
67 static boolean is_64_bit_system;
68
69 private static boolean is_64_bit_system() { return is_64_bit_system; }
70
71 public static void main(String args[]) throws Exception {
72 is_64_bit_system = (Platform.is64bit());
73
74 OutputAnalyzer output;
75 whiteBox = WhiteBox.getWhiteBox();
76
77 // Grab my own PID
78 String pid = Long.toString(ProcessTools.getProcessId());
79 ProcessBuilder pb = new ProcessBuilder();
80
81 AllocThread[] alloc_threads = new AllocThread[256];
82 ReleaseThread[] release_threads = new ReleaseThread[64];
83
84 int index;
85 // Create many allocation threads
86 for (index = 0; index < alloc_threads.length; index ++) {
87 alloc_threads[index] = new AllocThread();
88 }
89
90 // Fewer release threads
91 for (index = 0; index < release_threads.length; index ++) {
92 release_threads[index] = new ReleaseThread();
93 }
94
95 if (is_64_bit_system()) {
96 sleep_wait(2*60*1000);
97 } else {
98 sleep_wait(60*1000);
99 }
100 // pause the stress test
101 phase = TestPhase.pause;
102 while (pause_count.intValue() < alloc_threads.length + release_threads.length) {
103 sleep_wait(10);
104 }
105
106 long mallocd_total_in_KB = (mallocd_total + K / 2) / K;
107
108 // Now check if the result from NMT matches the total memory allocated.
109 String expected_test_summary = "Test (reserved=" + mallocd_total_in_KB +"KB, committed=" + mallocd_total_in_KB + "KB)";
110 // Run 'jcmd <pid> VM.native_memory summary'
111 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "summary"});
112 output = new OutputAnalyzer(pb.start());
113 output.shouldContain(expected_test_summary);
114
115 // Release all allocated memory
116 phase = TestPhase.release;
117 synchronized(mallocd_memory) {
118 mallocd_memory.notifyAll();
119 }
120
121 // Join all threads
122 for (index = 0; index < alloc_threads.length; index ++) {
123 try {
124 alloc_threads[index].join();
125 } catch (InterruptedException e) {
126 }
127 }
128
129 for (index = 0; index < release_threads.length; index ++) {
130 try {
131 release_threads[index].join();
132 } catch (InterruptedException e) {
133 }
134 }
135
136 // All test memory allocated should be released
137 output = new OutputAnalyzer(pb.start());
138 output.shouldNotContain("Test (reserved=");
139
140 // Verify that tracking level has not been downgraded
141 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
142 output = new OutputAnalyzer(pb.start());
143 output.shouldNotContain("Tracking level has been downgraded due to lack of resources");
144 }
145
146 private static void sleep_wait(int n) {
147 try {
148 Thread.sleep(n);
149 } catch (InterruptedException e) {
150 }
151 }
152
153
154 static class MallocMemory {
155 private long addr;
156 private int size;
157
158 MallocMemory(long addr, int size) {
159 this.addr = addr;
160 this.size = size;
161 }
162
163 long addr() { return this.addr; }
164 int size() { return this.size; }
165 }
166
167 static class AllocThread extends Thread {
168 AllocThread() {
169 this.setName("MallocThread");
170 this.start();
171 }
172
173 // AllocThread only runs "Alloc" phase
174 public void run() {
175 Random random = new Random();
176 while (MallocStressTest.phase == TestPhase.alloc) {
177 int r = Math.abs(random.nextInt());
178 // Only malloc small amount to avoid OOM
179 int size = r % 32;
180 if (is_64_bit_system()) {
181 r = r % 32 * K;
182 } else {
183 r = r % 64;
184 }
185 if (size == 0) size = 1;
186 long addr = MallocStressTest.whiteBox.NMTMallocWithPseudoStack(size, r);
187 if (addr != 0) {
188 MallocMemory mem = new MallocMemory(addr, size);
189 synchronized(MallocStressTest.mallocd_memory) {
190 MallocStressTest.mallocd_memory.add(mem);
191 MallocStressTest.mallocd_total += size;
192 }
193 } else {
194 System.out.println("Out of malloc memory");
195 break;
196 }
197 }
198 MallocStressTest.pause_count.incrementAndGet();
199 }
200 }
201
202 static class ReleaseThread extends Thread {
203 private Random random = new Random();
204 ReleaseThread() {
205 this.setName("ReleaseThread");
206 this.start();
207 }
208
209 public void run() {
210 while(true) {
211 switch(MallocStressTest.phase) {
212 case alloc:
213 slow_release();
214 break;
215 case pause:
216 enter_pause();
217 break;
218 case release:
219 quick_release();
220 return;
221 }
222 }
223 }
224
225 private void enter_pause() {
226 MallocStressTest.pause_count.incrementAndGet();
227 while (MallocStressTest.phase != MallocStressTest.TestPhase.release) {
228 try {
229 synchronized(MallocStressTest.mallocd_memory) {
230 MallocStressTest.mallocd_memory.wait(10);
231 }
232 } catch (InterruptedException e) {
233 }
234 }
235 }
236
237 private void quick_release() {
238 List<MallocMemory> free_list;
239 while (true) {
240 synchronized(MallocStressTest.mallocd_memory) {
241 if (MallocStressTest.mallocd_memory.isEmpty()) return;
242 int size = Math.min(MallocStressTest.mallocd_memory.size(), 5000);
243 List<MallocMemory> subList = MallocStressTest.mallocd_memory.subList(0, size);
244 free_list = new ArrayList<MallocMemory>(subList);
245 subList.clear();
246 }
247 for (int index = 0; index < free_list.size(); index ++) {
248 MallocMemory mem = free_list.get(index);
249 MallocStressTest.whiteBox.NMTFree(mem.addr());
250 }
251 }
252 }
253
254 private void slow_release() {
255 try {
256 Thread.sleep(10);
257 } catch (InterruptedException e) {
258 }
259 synchronized(MallocStressTest.mallocd_memory) {
260 if (MallocStressTest.mallocd_memory.isEmpty()) return;
261 int n = Math.abs(random.nextInt()) % MallocStressTest.mallocd_memory.size();
262 MallocMemory mem = mallocd_memory.remove(n);
263 MallocStressTest.whiteBox.NMTFree(mem.addr());
264 MallocStressTest.mallocd_total -= mem.size();
265 }
266 }
267 }
268 }