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@ijuma /FastMathTestPerformance.java
Created Feb 23, 2011

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Modified from the version in Commons Math to fix some micro-benchmarking problems.
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FastMathTestPerformance.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.math.util;
import org.junit.BeforeClass;
import org.junit.Test;
/**
* Performance tests for FastMath.
* Not enabled by default, as the class does not end in Test.
*
* Invoke by running<br/>
* {@code mvn test -Dtest=FastMathTestPerformance}<br/>
* or by running<br/>
* {@code mvn test -Dtest=FastMathTestPerformance -DargLine="-DtestRuns=1234 -server"}<br/>
*/
public class FastMathTestPerformance {
private static final int RUNS = Integer.parseInt(System.getProperty("testRuns","10000000"));
private static final double F1 = 1d / RUNS;
// Header format
private static final String FMT_HDR = "%-5s %13s %13s %13s Runs=%d Java %s (%s) %s (%s)";
// Detail format
private static final String FMT_DTL = "%-5s %6d %6.1f %6d %6.4f %6d %6.4f";
@BeforeClass
public static void header() {
System.out.println(String.format(FMT_HDR,
"Name","StrictMath","FastMath","Math",RUNS,
System.getProperty("java.version"),
System.getProperty("java.runtime.version","?"),
System.getProperty("java.vm.name"),
System.getProperty("java.vm.version")
));
}
private static void report(String name, double result, long strictMathTime, long fastMathTime, long mathTime) {
long unitTime = strictMathTime;
System.out.println("Keep HotSpot honest: " + result);
System.out.println(String.format(FMT_DTL,
name,
strictMathTime / RUNS, (double) strictMathTime / unitTime,
fastMathTime / RUNS, (double) fastMathTime / unitTime,
mathTime / RUNS, (double) mathTime / unitTime
));
}
@Test
public void test() {
for (int i = 0; i < 10; ++i) {
testLog();
testLog10();
testLog1p();
testPow();
testPowFromIntToInt();
testExp();
testSin();
testAsin();
testCos();
testAcos();
testTan();
testAtan();
testAtan2();
testHypot();
testCbrt();
testSqrt();
testCosh();
testSinh();
testTanh();
testExpm1();
testAbs();
}
}
public void testLog() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.log(Math.PI + i/* 1.0 + i/1e9 */);
long strictMath = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.log(Math.PI + i/* 1.0 + i/1e9 */);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.log(Math.PI + i/* 1.0 + i/1e9 */);
long mathTime = System.nanoTime() - time;
report("log", x + y + z, strictMath, fastTime, mathTime);
}
public void testLog10() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.log10(Math.PI + i/* 1.0 + i/1e9 */);
long strictMath = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.log10(Math.PI + i/* 1.0 + i/1e9 */);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.log10(Math.PI + i/* 1.0 + i/1e9 */);
long mathTime = System.nanoTime() - time;
report("log10", x + y + z, strictMath,fastTime,mathTime);
}
public void testLog1p() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.log1p(Math.PI + i/* 1.0 + i/1e9 */);
long strictMath = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.log1p(Math.PI + i/* 1.0 + i/1e9 */);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.log1p(Math.PI + i/* 1.0 + i/1e9 */);
long mathTime = System.nanoTime() - time;
report("log1p", x + y + z, strictMath,fastTime,mathTime);
}
public void testPow() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.pow(Math.PI + i * F1, i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.pow(Math.PI + i * F1, i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.pow(Math.PI + i * F1, i * F1);
long mathTime = System.nanoTime() - time;
report("pow", x + y + z, strictTime,fastTime,mathTime);
}
public void testPowFromIntToInt() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.pow(i, i);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.pow(i, i);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.pow(i, i);
long mathTime = System.nanoTime() - time;
report("powII", x + y + z, strictTime,fastTime,mathTime);
}
public void testExp() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.exp(i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.exp(i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.exp(i * F1);
long mathTime = System.nanoTime() - time;
report("exp", x + y + z, strictTime,fastTime,mathTime);
}
public void testSin() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.sin(i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.sin(i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.sin(i * F1);
long mathTime = System.nanoTime() - time;
report("sin", x + y + z, strictTime,fastTime,mathTime);
}
public void testAsin() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.asin(i / 10000000.0);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.asin(i / 10000000.0);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.asin(i / 10000000.0);
long mathTime = System.nanoTime() - time;
report("asin", x + y + z, strictTime,fastTime,mathTime);
}
public void testCos() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.cos(i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.cos(i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.cos(i * F1);
long mathTime = System.nanoTime() - time;
report("cos", x + y + z, strictTime,fastTime,mathTime);
}
public void testAcos() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.acos(i / 10000000.0);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.acos(i / 10000000.0);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.acos(i / 10000000.0);
long mathTime = System.nanoTime() - time;
report("acos", x + y + z, strictTime,fastTime,mathTime);
}
public void testTan() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.tan(i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.tan(i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.tan(i * F1);
long mathTime = System.nanoTime() - time;
report("tan", x + y + z, strictTime,fastTime,mathTime);
}
public void testAtan() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.atan(i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.atan(i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.atan(i * F1);
long mathTime = System.nanoTime() - time;
report("atan", x + y + z, strictTime,fastTime,mathTime);
}
public void testAtan2() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.atan2(i * F1, i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.atan2(i * F1, i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.atan2(i * F1, i * F1);
long mathTime = System.nanoTime() - time;
report("atan2", x + y + z, strictTime,fastTime,mathTime);
}
public void testHypot() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.hypot(i * F1, i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.hypot(i * F1, i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.hypot(i * F1, i * F1);
long mathTime = System.nanoTime() - time;
report("hypot", x + y + z, strictTime,fastTime,mathTime);
}
public void testCbrt() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.cbrt(i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.cbrt(i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.cbrt(i * F1);
long mathTime = System.nanoTime() - time;
report("cbrt", x + y + z, strictTime,fastTime,mathTime);
}
public void testSqrt() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.sqrt(i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.sqrt(i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.sqrt(i * F1);
long mathTime = System.nanoTime() - time;
report("sqrt", x + y + z, strictTime,fastTime,mathTime);
}
public void testCosh() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.cosh(i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.cosh(i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.cosh(i * F1);
long mathTime = System.nanoTime() - time;
report("cosh", x + y + z, strictTime,fastTime,mathTime);
}
public void testSinh() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.sinh(i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.sinh(i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.sinh(i * F1);
long mathTime = System.nanoTime() - time;
report("sinh", x + y + z, strictTime,fastTime,mathTime);
}
public void testTanh() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.tanh(i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.tanh(i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.tanh(i * F1);
long mathTime = System.nanoTime() - time;
report("tanh", x + y + z, strictTime,fastTime,mathTime);
}
public void testExpm1() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.expm1(-i * F1);
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.expm1(-i * F1);
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
z += Math.expm1(-i * F1);
long mathTime = System.nanoTime() - time;
report("expm1", x + y + z, strictTime,fastTime,mathTime);
}
public void testAbs() {
System.gc();
double x = 0;
long time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += StrictMath.abs(i * (1 - 0.5 * RUNS));
long strictTime = System.nanoTime() - time;
System.gc();
double y = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
y += FastMath.abs(i * (1 - 0.5 * RUNS));
long fastTime = System.nanoTime() - time;
System.gc();
double z = 0;
time = System.nanoTime();
for (int i = 0; i < RUNS; i++)
x += Math.abs(i * (1 - 0.5 * RUNS));
long mathTime = System.nanoTime() - time;
report("abs", x + y + z, strictTime,fastTime,mathTime);
}
}
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