    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}