jdk-24/test/micro/org/openjdk/bench/loom/obsolete/Oscillation.java

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/*
* Copyright (c) 2018, 2022, 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.loom.obsolete;
import jdk.internal.vm.Continuation;
import jdk.internal.vm.ContinuationScope;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.*;
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Benchmark)
@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(1)
public class Oscillation {
static final ContinuationScope SCOPE = new ContinuationScope() { };
/**
* A task that oscillates between a minimum and maximum stack depth, yielding
* at the maximum stack until continued.
*/
static class Wave implements Runnable {
private final int min;
private final int max;
private enum Mode { GROW, SHRINK }
private Mode mode;
Wave(int min, int max) {
if (min < 0)
throw new IllegalArgumentException("negative min");
if (max <= min)
throw new IllegalArgumentException("max must be greater than min");
this.min = min;
this.max = max;
this.mode = Mode.GROW;
}
private void run(int depth) {
if (depth == max) {
Continuation.yield(SCOPE);
mode = Mode.SHRINK;
} else if (depth == min) {
while (true) {
mode = Mode.GROW;
run(depth + 1);
}
} else if (mode == Mode.GROW) {
run(depth + 1);
}
}
@Override
public void run() {
run(0);
}
}
@Param({"2", "3", "4"})
public int minDepth;
@Param({"5", "6", "7", "8"})
public int maxDepth;
@Param({"10", "100", "1000"})
public int repeat;
/**
* Creates and runs a continuation that oscillates between a minimum and
* maximum stack depth, yielding at the maximum stack until continued.
*
* Useful to measure freeze and thaw, also to compare full stack vs. lazy copy.
*/
@Benchmark
public void oscillate() {
Continuation cont = new Continuation(SCOPE, new Wave(minDepth, maxDepth));
for (int i=0; i<repeat; i++) {
cont.run();
}
}
}