PerfTest xref

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    1   /**
    2    * Copyright (c) 2004-2011 QOS.ch
    3    * All rights reserved.
    4    *
    5    * Permission is hereby granted, free  of charge, to any person obtaining
    6    * a  copy  of this  software  and  associated  documentation files  (the
    7    * "Software"), to  deal in  the Software without  restriction, including
    8    * without limitation  the rights to  use, copy, modify,  merge, publish,
    9    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
    10   * permit persons to whom the Software  is furnished to do so, subject to
    11   * the following conditions:
    12   *
    13   * The  above  copyright  notice  and  this permission  notice  shall  be
    14   * included in all copies or substantial portions of the Software.
    15   *
    16   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
    17   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
    18   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
    19   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
    20   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    21   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
    22   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    23   *
    24   */
    25  package org.slf4j.impl;
    26
    27  import junit.framework.TestCase;
    28
    29  import org.slf4j.Logger;
    30  import org.slf4j.LoggerFactory;
    31  import org.slf4j.helpers.BogoPerf;
    32
    33  public class PerfTest extends TestCase {
    34
    35    static long REFERENCE_BIPS = 9000;
    36
    37    public PerfTest(String name) {
    38      super(name);
    39    }
    40
    41    protected void setUp() throws Exception {
    42      super.setUp();
    43    }
    44
    45    protected void tearDown() throws Exception {
    46      super.tearDown();
    47    }
    48
    49    public void testBug72() {
    50
    51      int LEN = 1000*1000*10;
    52      debugLoop(LEN); // warm up
    53      double avg = debugLoop(LEN);
    54      long referencePerf = 93;
    55      BogoPerf.assertDuration(avg, referencePerf, REFERENCE_BIPS);
    56
    57      // when the code is guarded by a logger.isLoggable condition,
    58      // duration is about 16 *micro*seconds for 1000 iterations
    59      // when it is not guarded the figure is 90 milliseconds,
    60      // i.e a ration of 1 to 5000
    61    }
    62
    63    double debugLoop(int len) {
    64      Logger logger = LoggerFactory.getLogger(PerfTest.class);
    65      long start = System.currentTimeMillis();
    66      for (int i = 0; i < len; i++) {
    67        logger.debug("hello");
    68      }
    69
    70      long end = System.currentTimeMillis();
    71
    72      long duration = end - start;
    73      return duration;
    74    }
    75
    76  }