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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  }