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benchmark.Test Maven / Gradle / Ivy
package benchmark;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import java.util.Arrays;
import java.util.LinkedList;
/**
*
* @author Two
*/
public class Test {
private static class Testresult {
public final String description;
public final long timeNS;
public Testresult(final String description, final long timeNS) {
this.description = description + ":";
this.timeNS = timeNS;
}
public void out(final long maxTimeNS) {
final double percent = ((double) timeNS) / ((double) maxTimeNS) * 100.0;
System.out.println(String.format("%-29s %15d ns %#6.2f%%", new Object[]{this.description, this.timeNS, percent}));
}
}
protected final static int SIZE = 16;
protected final static int ITERARIONS = 10_000_000;
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
long ns = System.nanoTime(), largest; // warmup
int i, pos;
float value;
final LinkedList arrayResults = new LinkedList<>();
final LinkedList bufferResults = new LinkedList<>();
final LinkedList bufferDResults = new LinkedList<>();
System.out.println("Using arrays of size " + SIZE + " with " + ITERARIONS + " iterations...");
final float[] fArray = new float[SIZE];
final FloatBuffer buffer = FloatBuffer.allocate(SIZE);
if (buffer.isDirect()) {
throw new RuntimeException("Non-direct buffer is direct!");
}
final FloatBuffer bufferD = ByteBuffer.allocateDirect(SIZE * 4).asFloatBuffer();
if (bufferD.isDirect() == false) {
throw new RuntimeException("Direct buffer is non-direct!");
}
final float[] helper = new float[SIZE];
final FloatBuffer bufferHelper = FloatBuffer.allocate(SIZE);
final FloatBuffer bufferDHelper = ByteBuffer.allocateDirect(SIZE * 4).asFloatBuffer();
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
for (pos = SIZE - 1; pos >= 0; --pos) {
fArray[pos] = 1.0f;
}
}
arrayResults.add(new Testresult("Loop-write array", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
Arrays.fill(fArray, 1.0f);
}
arrayResults.add(new Testresult("Arrays.fill", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
for (pos = SIZE - 1; pos >= 0; --pos) {
helper[pos] = fArray[pos];
}
}
arrayResults.add(new Testresult("Loop-read array", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
System.arraycopy(fArray, 0, helper, 0, fArray.length);
}
arrayResults.add(new Testresult("System.arraycopy", System.nanoTime() - ns));
bufferHelper.put(helper);
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
buffer.rewind();
for (pos = SIZE - 1; pos >= 0; --pos) {
buffer.put(1.0f);
}
}
bufferResults.add(new Testresult("Loop-put buffer", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
buffer.rewind();
for (pos = SIZE - 1; pos >= 0; --pos) {
buffer.put(pos, 1.0f);
}
}
bufferResults.add(new Testresult("Index-put buffer", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
buffer.rewind();
buffer.put(helper);
}
bufferResults.add(new Testresult("Bulk-put array->buffer", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
buffer.rewind();
buffer.put(bufferHelper);
}
bufferResults.add(new Testresult("Bulk-put buffer->buffer", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
buffer.rewind();
buffer.put(bufferDHelper);
}
bufferResults.add(new Testresult("Bulk-put bufferD->buffer", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
buffer.rewind();
for (pos = SIZE - 1; pos >= 0; --pos) {
value = buffer.get();
}
}
bufferResults.add(new Testresult("Loop-get buffer", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
buffer.rewind();
for (pos = SIZE - 1; pos >= 0; --pos) {
value = buffer.get(pos);
}
}
bufferResults.add(new Testresult("Index-get buffer", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
buffer.rewind();
buffer.get(helper);
}
bufferResults.add(new Testresult("Bulk-get buffer->array", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
bufferD.rewind();
for (pos = SIZE - 1; pos >= 0; --pos) {
bufferD.put(1.0f);
}
}
bufferDResults.add(new Testresult("Loop-put bufferD", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
bufferD.rewind();
for (pos = SIZE - 1; pos >= 0; --pos) {
bufferD.put(pos, 1.0f);
}
}
bufferDResults.add(new Testresult("Index-put bufferD", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
bufferD.rewind();
bufferD.put(helper);
}
bufferDResults.add(new Testresult("Bulk-put array->bufferD", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
bufferD.rewind();
bufferD.put(bufferHelper);
}
bufferDResults.add(new Testresult("Bulk-put buffer->bufferD", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
bufferD.rewind();
bufferD.put(bufferDHelper);
}
bufferDResults.add(new Testresult("Bulk-put bufferD->bufferD", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
bufferD.rewind();
for (pos = SIZE - 1; pos >= 0; --pos) {
value = bufferD.get();
}
}
bufferDResults.add(new Testresult("Loop-get bufferD", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
bufferD.rewind();
for (pos = SIZE - 1; pos >= 0; --pos) {
value = bufferD.get(pos);
}
}
bufferDResults.add(new Testresult("Index-get bufferD", System.nanoTime() - ns));
ns = System.nanoTime();
for (i = ITERARIONS; i > 0; --i) {
bufferD.rewind();
bufferD.get(helper);
}
bufferDResults.add(new Testresult("Bulk-get bufferD->array", System.nanoTime() - ns));
largest = 0;
for (Testresult result : arrayResults) {
largest = Math.max(largest, result.timeNS);
}
for (Testresult result : bufferResults) {
largest = Math.max(largest, result.timeNS);
}
for (Testresult result : bufferDResults) {
largest = Math.max(largest, result.timeNS);
}
System.out.println("-- Array tests -----------------------------------------");
for (Testresult result : arrayResults) {
result.out(largest);
}
System.out.println("-- Buffer tests ----------------------------------------");
for (Testresult result : bufferResults) {
result.out(largest);
}
System.out.println("-- Direct buffer tests ---------------------------------");
for (Testresult result : bufferDResults) {
result.out(largest);
}
}
}
