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 }