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/.factorypath | |||
/.classpath | |||
/.project | |||
/.settings/ |
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microbenchmarks/loom/src/main/java/org/openjdk/benchmarks/cont/FreezeAndThaw.java
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/* | |||
* Copyright (c) 2018, 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. | |||
*/ | |||
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package org.openjdk.benchmarks.cont; | |||
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import java.util.concurrent.TimeUnit; | |||
import org.openjdk.jmh.annotations.*; | |||
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@BenchmarkMode(Mode.AverageTime) | |||
@OutputTimeUnit(TimeUnit.NANOSECONDS) | |||
@State(Scope.Thread) | |||
@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS) | |||
@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS) | |||
@Fork(1) | |||
public class FreezeAndThaw { | |||
static final ContinuationScope SCOPE = new ContinuationScope() { }; | |||
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static class Arg { | |||
volatile int field; | |||
} | |||
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/** | |||
* A recursive task that optionally yields when the stack gets to a specific | |||
* depth. If continued after yielding, it runs to completion. | |||
*/ | |||
static class Yielder implements Runnable { | |||
private final int paramCount; | |||
private final int maxDepth; | |||
private final boolean yieldAtLimit; | |||
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private Yielder(int paramCount, int maxDepth, boolean yieldAtLimit) { | |||
if (paramCount < 1 || paramCount > 3) | |||
throw new IllegalArgumentException(); | |||
this.paramCount = paramCount; | |||
this.maxDepth = maxDepth; | |||
this.yieldAtLimit = yieldAtLimit; | |||
} | |||
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@Override | |||
public void run() { | |||
switch (paramCount) { | |||
case 1: run1(maxDepth); break; | |||
case 2: run2(maxDepth, new Arg()); break; | |||
case 3: run3(maxDepth, new Arg(), new Arg()); break; | |||
default: throw new Error("should not happen"); | |||
} | |||
} | |||
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private void run1(int depth) { | |||
if (depth > 0) { | |||
run1(depth - 1); | |||
} if (depth == 0) { | |||
if (yieldAtLimit) Continuation.yield(SCOPE); | |||
} | |||
} | |||
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private void run2(int depth, Arg arg2) { | |||
if (depth > 0) { | |||
run2(depth - 1, arg2); | |||
} if (depth == 0) { | |||
if (yieldAtLimit) Continuation.yield(SCOPE); | |||
} else { | |||
// never executed | |||
arg2.field = 0; | |||
} | |||
} | |||
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private void run3(int depth, Arg arg2, Arg arg3) { | |||
if (depth > 0) { | |||
run3(depth - 1, arg2, arg3); | |||
} if (depth == 0) { | |||
if (yieldAtLimit) { | |||
Continuation.yield(SCOPE); | |||
} | |||
} else { | |||
// never executed | |||
arg2.field = 0; | |||
arg3.field = 0; | |||
} | |||
} | |||
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static Continuation continuation(int paramCount, int maxDepth, | |||
boolean yieldAtLimit) { | |||
Runnable task = new Yielder(paramCount, maxDepth, yieldAtLimit); | |||
return new Continuation(SCOPE, 2000, task); | |||
} | |||
} | |||
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@Param({"1", "2", "3"}) | |||
public int paramCount; | |||
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@Param({"5", "10", "20", "100"}) | |||
public int stackDepth; | |||
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Continuation cont; | |||
Continuation cont0; | |||
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@Setup(Level.Invocation) | |||
public void setup() { | |||
// System.out.println("pc = " + paramCount + " sd = " + stackDepth); | |||
cont = Yielder.continuation(paramCount, stackDepth, true); | |||
cont0 = Yielder.continuation(paramCount, stackDepth, false); | |||
} | |||
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/** | |||
* Creates and runs a continuation that yields at a given stack depth. | |||
*/ | |||
@Benchmark | |||
public void baseline() { | |||
// Continuation cont0 = Yielder.continuation(paramCount, stackDepth, false); | |||
cont0.run(); | |||
assert cont0.isDone(); | |||
} | |||
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/** | |||
* Creates and runs a continuation that yields at a given stack depth. | |||
*/ | |||
@Benchmark | |||
public void yieldAndContinue() { | |||
// Continuation cont = Yielder.continuation(paramCount, stackDepth, true); | |||
cont.run(); | |||
assert !cont.isDone(); | |||
cont.run(); | |||
assert cont.isDone(); | |||
} | |||
} |
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