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/*
* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @summary Stress test virtual threads with a variation of the Skynet 1M benchmark that uses
* a channel implementation based on object monitors. This variant uses a reduced number of
* 100k virtual threads at the final level.
* @requires vm.debug != true & vm.continuations & vm.opt.LockingMode != 1
* @run main/othervm/timeout=300 Skynet100kWithMonitors 50
*/
/*
* @test
* @requires vm.debug == true & vm.continuations & vm.opt.LockingMode != 1
* @run main/othervm/timeout=300 Skynet100kWithMonitors 10
*/
public class Skynet100kWithMonitors {
public static void main(String[] args) {
int iterations = (args.length) > 0 ? Integer.parseInt(args[0]) : 10;
for (int i = 0; i < iterations; i++) {
skynet(100_000, 4999950000L);
}
}
static void skynet(int num, long expected) {
long start = System.currentTimeMillis();
var chan = new Channel<Long>();
Thread.startVirtualThread(() -> skynet(chan, 0, num, 10));
long sum = chan.receive();
long end = System.currentTimeMillis();
System.out.format("Result: %d in %s ms%n", sum, (end-start));
if (sum != expected)
throw new RuntimeException("Expected " + expected);
}
static void skynet(Channel<Long> result, int num, int size, int div) {
if (size == 1) {
result.send((long)num);
} else {
var chan = new Channel<Long>();
for (int i = 0; i < div; i++) {
int subNum = num + i * (size / div);
Thread.startVirtualThread(() -> skynet(chan, subNum, size / div, div));
}
long sum = 0;
for (int i = 0; i < div; i++) {
sum += chan.receive();
}
result.send(sum);
}
}
static class Channel<T> {
private final Object lock = new Object();
private T element;
Channel() {
}
void send(T e) {
boolean interrupted = false;
synchronized (lock) {
while (element != null) {
try {
lock.wait();
} catch (InterruptedException x) {
interrupted = true;
}
}
element = e;
lock.notifyAll();
}
if (interrupted)
Thread.currentThread().interrupt();
}
T receive() {
T e;
boolean interrupted = false;
synchronized (lock) {
while ((e = element) == null) {
try {
lock.wait();
} catch (InterruptedException x) {
interrupted = true;
}
}
element = null;
lock.notifyAll();
}
if (interrupted)
Thread.currentThread().interrupt();
return e;
}
}
}
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