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 }