1 /*
2 * Copyright (c) 2022, 2023, 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 id=default
26 * @summary Stress test virtual threads with a variation of the Skynet 1M benchmark
27 * @requires vm.continuations
28 * @requires !vm.debug | vm.gc != "Z"
29 * @run main/othervm/timeout=300 -Xmx1g Skynet
30 */
31
32 /*
33 * @test id=ZSinglegen
34 * @requires vm.debug == true & vm.continuations
35 * @requires vm.gc.ZSinglegen
36 * @run main/othervm/timeout=300 -XX:+UnlockDiagnosticVMOptions
37 * -XX:+UseZGC -XX:-ZGenerational
38 * -XX:+ZVerifyOops -XX:ZCollectionInterval=0.01 -Xmx1g Skynet
39 */
40
41 /*
42 * @test id=ZGenerational
43 * @requires vm.debug == true & vm.continuations
44 * @requires vm.gc.ZGenerational
45 * @run main/othervm/timeout=300 -XX:+UnlockDiagnosticVMOptions
46 * -XX:+UseZGC -XX:+ZGenerational
47 * -XX:+ZVerifyOops -XX:ZCollectionInterval=0.01 -Xmx1g Skynet
48 */
49
50 import java.util.concurrent.BlockingQueue;
51 import java.util.concurrent.SynchronousQueue;
52 import java.util.concurrent.ThreadFactory;
53
54 public class Skynet {
55 public static void main(String[] args) {
56 int iterations = (args.length > 0) ? Integer.parseInt(args[0]) : 10;
57 for (int i = 0; i < iterations; i++) {
58 skynet(1_000_000, 499999500000L);
59 }
60 }
61
62 static void skynet(int num, long expected) {
63 long start = System.currentTimeMillis();
64 var chan = new Channel<Long>();
65
66 Thread.startVirtualThread(() -> skynet(chan, 0, num, 10));
67
68 long sum = chan.receive();
69 long end = System.currentTimeMillis();
70 System.out.format("Result: %d in %s ms%n", sum, (end-start));
71 if (sum != expected)
72 throw new AssertionError("unexpected result!");
73 }
74
75 static void skynet(Channel<Long> result, int num, int size, int div) {
76 if (size == 1) {
77 result.send((long)num);
78 } else {
79 var chan = new Channel<Long>();
80 for (int i = 0; i < div; i++) {
81 int subNum = num + i * (size / div);
82 Thread.startVirtualThread(() -> skynet(chan, subNum, size / div, div));
83 }
84 long sum = 0;
85 for (int i = 0; i < div; i++) {
86 sum += chan.receive();
87 }
88 result.send(sum);
89 }
90 }
91
92 static class Channel<T> {
93 private final BlockingQueue<T> q;
94
95 Channel() {
96 q = new SynchronousQueue<>();
97 }
98
99 void send(T e) {
100 boolean interrupted = false;
101 while (true) {
102 try {
103 q.put(e);
104 break;
105 } catch (InterruptedException x) {
106 interrupted = true;
107 }
108 }
109 if (interrupted)
110 Thread.currentThread().interrupt();
111 }
112
113 T receive() {
114 boolean interrupted = false;
115 T e;
116 while (true) {
117 try {
118 e = q.take();
119 break;
120 } catch (InterruptedException x) {
121 interrupted = true;
122 }
123 }
124 if (interrupted)
125 Thread.currentThread().interrupt();
126 return e;
127 }
128 }
129 }