1 /*
2 * Copyright (c) 2014, 2016, 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.JDKToolFinder;
42 import jdk.test.lib.Platform;
43 import jdk.test.lib.process.ProcessTools;
44 import jdk.test.lib.process.OutputAnalyzer;
45 import sun.hotspot.WhiteBox;
46
47 public class MallocStressTest {
48 private static int K = 1024;
49
50 // The stress test runs in three phases:
51 // 1. alloc: A lot of malloc with fewer free, which simulates a burst memory allocation
52 // that is usually seen during startup or class loading.
53 // 2. pause: Pause the test to check accuracy of native memory tracking
54 // 3. release: Release all malloc'd memory and check native memory tracking result.
55 public enum TestPhase {
56 alloc,
57 pause,
58 release
59 };
60
61 static TestPhase phase = TestPhase.alloc;
62
63 // malloc'd memory
64 static ArrayList<MallocMemory> mallocd_memory = new ArrayList<MallocMemory>();
65 static long mallocd_total = 0;
66 static WhiteBox whiteBox;
67 static AtomicInteger pause_count = new AtomicInteger();
68
69 static boolean is_64_bit_system;
70
71 private static boolean is_64_bit_system() { return is_64_bit_system; }
72
73 public static void main(String args[]) throws Exception {
74 is_64_bit_system = (Platform.is64bit());
75
76 OutputAnalyzer output;
77 whiteBox = WhiteBox.getWhiteBox();
78
79 // Grab my own PID
80 String pid = Long.toString(ProcessTools.getProcessId());
81 ProcessBuilder pb = new ProcessBuilder();
82
83 AllocThread[] alloc_threads = new AllocThread[256];
84 ReleaseThread[] release_threads = new ReleaseThread[64];
85
86 int index;
87 // Create many allocation threads
88 for (index = 0; index < alloc_threads.length; index ++) {
89 alloc_threads[index] = new AllocThread();
90 }
91
92 // Fewer release threads
93 for (index = 0; index < release_threads.length; index ++) {
94 release_threads[index] = new ReleaseThread();
95 }
96
97 if (is_64_bit_system()) {
98 sleep_wait(2*60*1000);
99 } else {
100 sleep_wait(60*1000);
101 }
102 // pause the stress test
103 phase = TestPhase.pause;
104 while (pause_count.intValue() < alloc_threads.length + release_threads.length) {
105 sleep_wait(10);
106 }
107
108 long mallocd_total_in_KB = (mallocd_total + K / 2) / K;
109
110 // Now check if the result from NMT matches the total memory allocated.
111 String expected_test_summary = "Test (reserved=" + mallocd_total_in_KB +"KB, committed=" + mallocd_total_in_KB + "KB)";
112 // Run 'jcmd <pid> VM.native_memory summary'
113 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "summary"});
114 output = new OutputAnalyzer(pb.start());
115 output.shouldContain(expected_test_summary);
116
117 // Release all allocated memory
118 phase = TestPhase.release;
119 synchronized(mallocd_memory) {
120 mallocd_memory.notifyAll();
121 }
122
123 // Join all threads
124 for (index = 0; index < alloc_threads.length; index ++) {
125 try {
126 alloc_threads[index].join();
127 } catch (InterruptedException e) {
128 }
129 }
130
131 for (index = 0; index < release_threads.length; index ++) {
132 try {
133 release_threads[index].join();
134 } catch (InterruptedException e) {
135 }
136 }
137
138 // All test memory allocated should be released
139 output = new OutputAnalyzer(pb.start());
140 output.shouldNotContain("Test (reserved=");
141
142 // Verify that tracking level has not been downgraded
143 pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
144 output = new OutputAnalyzer(pb.start());
145 output.shouldNotContain("Tracking level has been downgraded due to lack of resources");
146 }
147
148 private static void sleep_wait(int n) {
149 try {
150 Thread.sleep(n);
151 } catch (InterruptedException e) {
152 }
153 }
154
155
156 static class MallocMemory {
157 private long addr;
158 private int size;
159
160 MallocMemory(long addr, int size) {
161 this.addr = addr;
162 this.size = size;
163 }
164
165 long addr() { return this.addr; }
166 int size() { return this.size; }
167 }
168
169 static class AllocThread extends Thread {
170 AllocThread() {
171 this.setName("MallocThread");
172 this.start();
173 }
174
175 // AllocThread only runs "Alloc" phase
176 public void run() {
177 Random random = new Random();
178 while (MallocStressTest.phase == TestPhase.alloc) {
179 int r = Math.abs(random.nextInt());
180 // Only malloc small amount to avoid OOM
181 int size = r % 32;
182 if (is_64_bit_system()) {
183 r = r % 32 * K;
184 } else {
185 r = r % 64;
186 }
187 if (size == 0) size = 1;
188 long addr = MallocStressTest.whiteBox.NMTMallocWithPseudoStack(size, r);
189 if (addr != 0) {
190 MallocMemory mem = new MallocMemory(addr, size);
191 synchronized(MallocStressTest.mallocd_memory) {
192 MallocStressTest.mallocd_memory.add(mem);
193 MallocStressTest.mallocd_total += size;
194 }
195 } else {
196 System.out.println("Out of malloc memory");
197 break;
198 }
199 }
200 MallocStressTest.pause_count.incrementAndGet();
201 }
202 }
203
204 static class ReleaseThread extends Thread {
205 private Random random = new Random();
206 ReleaseThread() {
207 this.setName("ReleaseThread");
208 this.start();
209 }
210
211 public void run() {
212 while(true) {
213 switch(MallocStressTest.phase) {
214 case alloc:
215 slow_release();
216 break;
217 case pause:
218 enter_pause();
219 break;
220 case release:
221 quick_release();
222 return;
223 }
224 }
225 }
226
227 private void enter_pause() {
228 MallocStressTest.pause_count.incrementAndGet();
229 while (MallocStressTest.phase != MallocStressTest.TestPhase.release) {
230 try {
231 synchronized(MallocStressTest.mallocd_memory) {
232 MallocStressTest.mallocd_memory.wait(10);
233 }
234 } catch (InterruptedException e) {
235 }
236 }
237 }
238
239 private void quick_release() {
240 List<MallocMemory> free_list;
241 while (true) {
242 synchronized(MallocStressTest.mallocd_memory) {
243 if (MallocStressTest.mallocd_memory.isEmpty()) return;
244 int size = Math.min(MallocStressTest.mallocd_memory.size(), 5000);
245 List<MallocMemory> subList = MallocStressTest.mallocd_memory.subList(0, size);
246 free_list = new ArrayList<MallocMemory>(subList);
247 subList.clear();
248 }
249 for (int index = 0; index < free_list.size(); index ++) {
250 MallocMemory mem = free_list.get(index);
251 MallocStressTest.whiteBox.NMTFree(mem.addr());
252 }
253 }
254 }
255
256 private void slow_release() {
257 try {
258 Thread.sleep(10);
259 } catch (InterruptedException e) {
260 }
261 synchronized(MallocStressTest.mallocd_memory) {
262 if (MallocStressTest.mallocd_memory.isEmpty()) return;
263 int n = Math.abs(random.nextInt()) % MallocStressTest.mallocd_memory.size();
264 MallocMemory mem = mallocd_memory.remove(n);
265 MallocStressTest.whiteBox.NMTFree(mem.addr());
266 MallocStressTest.mallocd_total -= mem.size();
267 }
268 }
269 }
270 }