1 /*
2 * Copyright (c) 2017, 2018, Red Hat, Inc. 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 package gc.epsilon;
25
26 /**
27 * @test TestManyThreads
28 * @requires vm.gc.Epsilon & !vm.graal.enabled
29 * @summary Test allocations from many threads
30 *
31 * @run main/othervm -Xmx128m -Xss512k -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestManyThreads
32 * @run main/othervm -Xmx128m -Xss512k -Xint -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestManyThreads
33 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestManyThreads
34 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestManyThreads
35 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:-TieredCompilation -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestManyThreads
36 *
37 * @run main/othervm -Xmx128m -Xss512k -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestManyThreads
38 * @run main/othervm -Xmx128m -Xss512k -Xint -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestManyThreads
39 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestManyThreads
40 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestManyThreads
41 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:-TieredCompilation -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestManyThreads
42 */
43
44 import java.util.concurrent.atomic.*;
45
46 public class TestManyThreads {
47
48 static int COUNT = Integer.getInteger("count", 128); // 128 * 4M max tlabs = 512M, would overflow without TLAB sizing
49
50 static volatile Object sink;
51 static volatile Throwable failed;
52 static final AtomicInteger allocated = new AtomicInteger();
53
54 public static void workload() {
55 try {
56 sink = new Object();
57 allocated.incrementAndGet();
58 Thread.sleep(3600 * 1000);
59 } catch (Throwable e) {
60 failed = e;
61 }
62 }
63
64 public static void main(String[] args) throws Throwable {
65 for (int c = 0; c < COUNT; c++) {
66 Thread t = new Thread(TestManyThreads::workload);
67 t.setDaemon(true);
68 t.start();
69 }
70
71 while ((failed == null) && (allocated.get() != COUNT)) {
72 Thread.sleep(100);
73 }
74
75 if (failed != null) {
76 throw failed;
77 }
78 }
79
80 }