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