drlvm/src/test/microbenchmark/harmony-3630/directCall/test.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.
 */

/**
 * Microbenchmark to measure performance for direct calls.
 */


final class Child {

    private long num;

    public Child() { num = 0; }
    public void inc() { num++; }
    public long getNum() { return num; }
    public void reset() { num = 0; }
}

public class test {
    
    static final long limit = 1000000000;

    static final Child obj = new Child();

    public static void main(String[] args) {
        test testObject = new test();

        long before = 0, after = 0;
	    long best = 0;

        for (int i = 0; i < 5; i++) {    
            obj.reset();

            before = System.currentTimeMillis();
            testObject.run();
            after = System.currentTimeMillis();
            
            long current = obj.getNum() / (((after - before)==0) ? 1 : (after - before));
            System.out.println("Current score: " + current);
            if (current > best) best = current;
        }
        System.out.println("Calls per millisecond: " + best);
    }

    public void run() {

        for (long k = 0; k < limit; k++ ) {
            obj.inc();
	    }
    }

}