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8307483: New micros for j.u.c.LockSupport

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Co-authored-by: Sergey Kuksenko <skuksenko@openjdk.org>
Reviewed-by: shade, redestad
This commit is contained in:
Eric Caspole 2023-05-17 20:39:26 +00:00
parent 24094482f0
commit 6073edf3cd
2 changed files with 273 additions and 0 deletions
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142
test/micro/org/openjdk/bench/java/util/concurrent/UnparkBenchSleepersAfter.java Normal file
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/*
* Copyright (c) 2023, 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.
*/
package org.openjdk.bench.java.util.concurrent;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.TearDown;
import org.openjdk.jmh.annotations.Threads;
import org.openjdk.jmh.annotations.Warmup;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.LockSupport;
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.SECONDS)
@State(Scope.Benchmark)
@Fork(1)
@Threads(1)
@Warmup(iterations = 5, time = 5)
@Measurement(iterations = 5, time = 5)
public class UnparkBenchSleepersAfter {
/*
This micro creates thousands of sleeper threads after the threads doing the barrier await
to see if that has any effect on the barrier performance.
*/
@Param({"4000"})
int idles;
@Param({"2"})
int workers;
CyclicBarrier barrier;
@Benchmark
public void barrier() throws InterruptedException {
CountDownLatch latch = new CountDownLatch(workers);
for (int i = 0; i < workers; i++) {
exec.submit(() ->
{
try {
barrier.await();
} catch (InterruptedException | BrokenBarrierException e) {
barrier.reset();
} finally {
latch.countDown();
}
});
}
latch.await();
}
IdleRunnable[] idleRunnables;
ExecutorService exec;
@Setup
public void setup() throws InterruptedException {
barrier = new CyclicBarrier(workers);
exec = Executors.newFixedThreadPool(workers);
CountDownLatch latch = new CountDownLatch(workers);
for (int i = 0; i < workers; i++) { // warmup exec
exec.submit(() -> {
try {
Thread.sleep(0);
} catch (InterruptedException e) {
throw new RuntimeException(e);
} finally {
latch.countDown();
}
});
}
latch.await();
idleRunnables = new IdleRunnable[idles];
for(int i = 0; i < idles; i++) {
IdleRunnable r = new IdleRunnable();
idleRunnables[i] = r;
new Thread(r).start();
}
}
@TearDown
public void tearDown() {
for (IdleRunnable r : idleRunnables) {
r.stop();
}
exec.shutdown();
}
public static class IdleRunnable implements Runnable {
volatile boolean done;
Thread myThread;
@Override
public void run() {
myThread = Thread.currentThread();
while (!done) {
LockSupport.park();
}
}
public void stop() {
done = true;
LockSupport.unpark(myThread);
}
}
}

131
test/micro/org/openjdk/bench/java/util/concurrent/UnparkBenchSleepersBefore.java Normal file
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/*
* Copyright (c) 2023, 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.
*/
package org.openjdk.bench.java.util.concurrent;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.TearDown;
import org.openjdk.jmh.annotations.Threads;
import org.openjdk.jmh.annotations.Warmup;
import org.openjdk.jmh.infra.BenchmarkParams;
import org.openjdk.jmh.infra.Control;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.LongAdder;
import java.util.concurrent.locks.LockSupport;
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.SECONDS)
@State(Scope.Benchmark)
@Fork(1)
@Threads(1)
@Warmup(iterations = 5, time = 5)
@Measurement(iterations = 5, time = 5)
public class UnparkBenchSleepersBefore {
/*
This micro creates thousands of sleeper threads before the threads doing the barrier await
to see if that has any effect on the barrier performance, as seen with JDK-8305670.
*/
@Param({"4000"})
int idles;
@Param({"2"})
int workers;
CyclicBarrier barrier;
@Benchmark
public void barrier() throws InterruptedException {
CountDownLatch latch = new CountDownLatch(workers);
for (int i = 0; i < workers; i++) {
exec.submit(() -> {
try {
barrier.await();
} catch (InterruptedException | BrokenBarrierException e) {
barrier.reset();
} finally {
latch.countDown();
}
});
}
latch.await();
}
IdleRunnable[] idleRunnables;
ExecutorService exec;
@Setup
public void setup() {
idleRunnables = new IdleRunnable[idles];
for(int i = 0; i < idleRunnables.length; i++) {
idleRunnables[i] = new IdleRunnable();
new Thread(idleRunnables[i]).start();
}
barrier = new CyclicBarrier(workers);
exec = Executors.newFixedThreadPool(workers); // order is important, create this executor only after idle threads
}
@TearDown
public void tearDown() {
for (IdleRunnable r : idleRunnables) {
r.stop();
}
exec.shutdown();
}
public static class IdleRunnable implements Runnable {
volatile boolean done;
Thread myThread;
@Override
public void run() {
myThread = Thread.currentThread();
while (!done) {
LockSupport.park();
}
}
public void stop() {
done = true;
LockSupport.unpark(myThread);
}
}
}