120 lines
3.8 KiB
Java
120 lines
3.8 KiB
Java
/*
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* Copyright (c) 2022, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test id=default
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* @summary Stress test virtual threads with a variation of the Skynet 1M benchmark
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* @requires vm.continuations
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* @requires !vm.debug | vm.gc != "Z"
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* @run main/othervm/timeout=300 -Xmx1500m Skynet
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*/
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/*
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* @test id=Z
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* @requires vm.debug == true & vm.continuations
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* @requires vm.gc.Z
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* @run main/othervm/timeout=300 -XX:+UnlockDiagnosticVMOptions
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* -XX:+UseZGC
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* -XX:+ZVerifyOops -XX:ZCollectionInterval=0.01 -Xmx1500m Skynet
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*/
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import java.util.concurrent.BlockingQueue;
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import java.util.concurrent.SynchronousQueue;
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import java.util.concurrent.ThreadFactory;
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public class Skynet {
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public static void main(String[] args) {
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int iterations = (args.length > 0) ? Integer.parseInt(args[0]) : 10;
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for (int i = 0; i < iterations; i++) {
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skynet(1_000_000, 499999500000L);
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}
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}
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static void skynet(int num, long expected) {
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long start = System.currentTimeMillis();
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var chan = new Channel<Long>();
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Thread.startVirtualThread(() -> skynet(chan, 0, num, 10));
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long sum = chan.receive();
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long end = System.currentTimeMillis();
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System.out.format("Result: %d in %s ms%n", sum, (end-start));
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if (sum != expected)
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throw new RuntimeException("Expected " + expected);
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}
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static void skynet(Channel<Long> result, int num, int size, int div) {
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if (size == 1) {
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result.send((long)num);
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} else {
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var chan = new Channel<Long>();
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for (int i = 0; i < div; i++) {
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int subNum = num + i * (size / div);
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Thread.startVirtualThread(() -> skynet(chan, subNum, size / div, div));
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}
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long sum = 0;
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for (int i = 0; i < div; i++) {
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sum += chan.receive();
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}
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result.send(sum);
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}
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}
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static class Channel<T> {
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private final BlockingQueue<T> q;
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Channel() {
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q = new SynchronousQueue<>();
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}
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void send(T e) {
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boolean interrupted = false;
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while (true) {
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try {
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q.put(e);
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break;
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} catch (InterruptedException x) {
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interrupted = true;
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}
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}
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if (interrupted)
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Thread.currentThread().interrupt();
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}
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T receive() {
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boolean interrupted = false;
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T e;
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while (true) {
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try {
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e = q.take();
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break;
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} catch (InterruptedException x) {
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interrupted = true;
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}
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}
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if (interrupted)
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Thread.currentThread().interrupt();
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return e;
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}
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}
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}
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