org.apache.jcs.engine.memory.mru.LRUvsMRUPerformanceTest.java Source code

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Here is the source code for org.apache.jcs.engine.memory.mru.LRUvsMRUPerformanceTest.java

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package org.apache.jcs.engine.memory.mru;

/*
 * 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.
 */

import junit.framework.TestCase;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.jcs.JCS;
import org.apache.jcs.engine.memory.lru.LRUMemoryCache;

/**
 * Tests the performance difference between the LRU and the MRU
 *
 */
public class LRUvsMRUPerformanceTest extends TestCase {

    float ratioPut = 0;

    float ratioGet = 0;

    float target = 1.20f;

    int loops = 20;

    int tries = 10000;

    /**
     * A unit test for JUnit
     *
     * @exception Exception
     *                Description of the Exception
     */
    public void testSimpleLoad() throws Exception {
        Log log1 = LogFactory.getLog(LRUMemoryCache.class);
        if (log1.isDebugEnabled()) {
            System.out.println("The log level must be at info or above for the a performance test.");
            return;
        }
        Log log2 = LogFactory.getLog(MRUMemoryCache.class);
        if (log2.isDebugEnabled()) {
            System.out.println("The log level must be at info or above for the a performance test.");
            return;
        }
        doWork();

        assertTrue("Ratio is unacceptible.", this.ratioPut < target);
        assertTrue("Ratio is unacceptible.", this.ratioGet < target);
    }

    /**
     * Runs the test
     */
    public void doWork() {

        long start = 0;
        long end = 0;
        long time = 0;
        float tPer = 0;

        long putTotalLRU = 0;
        long getTotalLRU = 0;
        long putTotalMRU = 0;
        long getTotalMRU = 0;

        try {

            JCS.setConfigFilename("/TestMRUCache.ccf");
            JCS cache = JCS.getInstance("lruDefined");
            JCS mru = JCS.getInstance("mruDefined");

            System.out.println("LRU = " + cache);

            for (int j = 0; j < loops; j++) {

                System.out.println("Beginning loop " + j);

                String name = "LRU      ";
                start = System.currentTimeMillis();
                for (int i = 0; i < tries; i++) {
                    cache.put("key:" + i, "data" + i);
                }
                end = System.currentTimeMillis();
                time = end - start;
                putTotalLRU += time;
                tPer = Float.intBitsToFloat((int) time) / Float.intBitsToFloat(tries);
                System.out.println(name + " put time for " + tries + " = " + time + "; millis per = " + tPer);

                start = System.currentTimeMillis();
                for (int i = 0; i < tries; i++) {
                    cache.get("key:" + i);
                }
                end = System.currentTimeMillis();
                time = end - start;
                getTotalLRU += time;
                tPer = Float.intBitsToFloat((int) time) / Float.intBitsToFloat(tries);
                System.out.println(name + " get time for " + tries + " = " + time + "; millis per = " + tPer);

                // /////////////////////////////////////////////////////////////
                name = "MRU";
                start = System.currentTimeMillis();
                for (int i = 0; i < tries; i++) {
                    mru.put("key:" + i, "data" + i);
                }
                end = System.currentTimeMillis();
                time = end - start;
                putTotalMRU += time;
                tPer = Float.intBitsToFloat((int) time) / Float.intBitsToFloat(tries);
                System.out.println(name + " put time for " + tries + " = " + time + "; millis per = " + tPer);

                start = System.currentTimeMillis();
                for (int i = 0; i < tries; i++) {
                    mru.get("key:" + i);
                }
                end = System.currentTimeMillis();
                time = end - start;
                getTotalMRU += time;
                tPer = Float.intBitsToFloat((int) time) / Float.intBitsToFloat(tries);
                System.out.println(name + " get time for " + tries + " = " + time + "; millis per = " + tPer);

                System.out.println("\n");
            }

        } catch (Exception e) {
            e.printStackTrace(System.out);
            System.out.println(e);
        }

        long putAvJCS = putTotalLRU / loops;
        long getAvJCS = getTotalLRU / loops;
        long putAvHashtable = putTotalMRU / loops;
        long getAvHashtable = getTotalMRU / loops;

        System.out.println("Finished " + loops + " loops of " + tries + " gets and puts");

        System.out.println("\n");
        System.out.println("Put average for JCS       = " + putAvJCS);
        System.out.println("Put average for MRU = " + putAvHashtable);
        ratioPut = Float.intBitsToFloat((int) putAvJCS) / Float.intBitsToFloat((int) putAvHashtable);
        System.out.println("JCS puts took " + ratioPut + " times the Hashtable, the goal is <" + target + "x");

        System.out.println("\n");
        System.out.println("Get average for JCS       = " + getAvJCS);
        System.out.println("Get average for MRU = " + getAvHashtable);
        ratioGet = Float.intBitsToFloat((int) getAvJCS) / Float.intBitsToFloat((int) getAvHashtable);
        System.out.println("JCS gets took " + ratioGet + " times the Hashtable, the goal is <" + target + "x");

    }

}