/*
* 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.pig.test;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import org.apache.pig.EvalFunc;
import org.apache.pig.builtin.InvokeForDouble;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
import org.junit.Test;
/**
* Tests {@link Invoker} speed comparing to raw calculation.
*/
public class TestInvokerSpeed {
private final TupleFactory tf_ = TupleFactory.getInstance();
@Test
public void testSpeed() throws IOException, SecurityException, ClassNotFoundException, NoSuchMethodException {
EvalFunc<Double> log = new Log();
Tuple tup = tf_.newTuple(1);
long start = System.currentTimeMillis();
for (int i=0; i < 1000000; i++) {
tup.set(0, (double) i);
log.exec(tup);
}
long staticSpeed = (System.currentTimeMillis()-start);
start = System.currentTimeMillis();
log = new InvokeForDouble("java.lang.Math.log", "Double", "static");
for (int i=0; i < 1000000; i++) {
tup.set(0, (double) i);
log.exec(tup);
}
long dynamicSpeed = System.currentTimeMillis()-start;
System.err.println("Dynamic to static ratio: "+((float) dynamicSpeed)/staticSpeed);
assertTrue( ((float) dynamicSpeed)/staticSpeed < 5);
}
private class Log extends EvalFunc<Double> {
@Override
public Double exec(Tuple input) throws IOException {
Double d = (Double) input.get(0);
return Math.log(d);
}
}
}