001/**
002 * Copyright (c) 2004-2011 QOS.ch
003 * All rights reserved.
004 *
005 * Permission is hereby granted, free  of charge, to any person obtaining
006 * a  copy  of this  software  and  associated  documentation files  (the
007 * "Software"), to  deal in  the Software without  restriction, including
008 * without limitation  the rights to  use, copy, modify,  merge, publish,
009 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
010 * permit persons to whom the Software  is furnished to do so, subject to
011 * the following conditions:
012 *
013 * The  above  copyright  notice  and  this permission  notice  shall  be
014 * included in all copies or substantial portions of the Software.
015 *
016 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
017 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
018 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
019 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
020 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
021 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
022 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
023 *
024 */
025package org.slf4j.impl;
026
027import org.junit.Ignore;
028import org.junit.Test;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031import org.slf4j.helpers.BogoPerf;
032
033@Ignore
034public class PerfTest {
035
036    static long REFERENCE_BIPS = 9000;
037
038    @Test
039    public void issue63() {
040
041        int LEN = 1000 * 1000 * 10;
042        debugLoop(LEN); // warm up
043        double avg = debugLoop(LEN);
044        long referencePerf = 93;
045        BogoPerf.assertDuration(avg, referencePerf, REFERENCE_BIPS);
046
047        // when the code is guarded by a logger.isLoggable condition,
048        // duration is about 16 *micro*seconds for 1000 iterations
049        // when it is not guarded the figure is 90 milliseconds,
050        // i.e. a ration of 1 to 5000
051    }
052
053    double debugLoop(int len) {
054        Logger logger = LoggerFactory.getLogger(PerfTest.class);
055        long start = System.currentTimeMillis();
056        for (int i = 0; i < len; i++) {
057            logger.debug("hello");
058        }
059
060        long end = System.currentTimeMillis();
061
062        long duration = end - start;
063        return duration;
064    }
065
066}