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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.text;
import org.junit.Ignore;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.TimeUnit;
import static org.junit.Assert.assertEquals;
@SuppressWarnings("deprecation")
/**
* @author arnej27959
*/
public class DoubleToStringBenchmark {
@Test
@Ignore
public void benchmarkStringConstruction() throws Exception {
List<Class<? extends Benchmark.Task>> taskList = Arrays.asList(UseStringValueOf.class,
UseDoubleFormatter.class,
UseDoubleFormatter.class,
UseStringValueOf.class,
UseStringValueOf.class,
UseDoubleFormatter.class,
UseDoubleFormatter.class,
UseStringValueOf.class,
UseDoubleFormatter.class,
UseStringValueOf.class);
int maxThreads = 256;
int dummy = 0;
System.out.print("warmup");
for (Class<? extends Benchmark.Task> taskClass : taskList) {
dummy += runBenchmark(maxThreads, taskClass);
System.out.print(".");
}
System.out.println(" " + dummy);
System.out.format("%-35s", "");
for (int numThreads = 1; numThreads <= maxThreads; numThreads *= 2) {
System.out.format("%13s t ", numThreads);
}
System.out.println();
for (Class<? extends Benchmark.Task> taskClass : taskList) {
System.out.format("%-35s", taskClass.getSimpleName());
for (int numThreads = 1; numThreads <= maxThreads; numThreads *= 2) {
System.out.format("%15d ", runBenchmark(numThreads, taskClass));
}
System.out.println();
}
}
private long runBenchmark(int numThreads, Class<? extends Benchmark.Task> taskClass) throws Exception {
return new Benchmark.Builder()
.setNumIterationsPerThread(80000)
.setNumThreads(numThreads)
.setTaskClass(taskClass)
.build()
.run();
}
public static class UseStringValueOf implements Benchmark.Task {
private long timeIt(Random randomGen, int num) {
long before = System.nanoTime();
String str = null;
double v = 0.0;
for (int i = 0; i < num; ++i) {
v = randomGen.nextDouble() * 1.0e-2;
str = String.valueOf(v);
}
long after = System.nanoTime();
assertEquals(""+v, str);
return after - before;
}
@Override
public long run(CyclicBarrier barrier, int numIterations) throws Exception {
Random randomGen = new Random(0xDeadBeef);
barrier.await(600, TimeUnit.SECONDS);
long t1 = timeIt(randomGen, numIterations / 4);
long t2 = timeIt(randomGen, numIterations / 2);
long t3 = timeIt(randomGen, numIterations / 4);
return t2;
}
}
public static class UseDoubleFormatter implements Benchmark.Task {
private long timeIt(Random randomGen, int num) {
long before = System.nanoTime();
String str = null;
double v = 0.0;
for (int i = 0; i < num; ++i) {
v = randomGen.nextDouble() * 1.0e-2;
str = DoubleFormatter.stringValue(v);
}
long after = System.nanoTime();
// assertEquals(""+v, str);
return after - before;
}
@Override
public long run(CyclicBarrier barrier, int numIterations) throws Exception {
Random randomGen = new Random(0xDeadBeef);
barrier.await(600, TimeUnit.SECONDS);
long t1 = timeIt(randomGen, numIterations / 4);
long t2 = timeIt(randomGen, numIterations / 2);
long t3 = timeIt(randomGen, numIterations / 4);
return t2;
}
}
}
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