1 /**
2 This file is part of GoldenGate Project (named also GoldenGate or GG).
3
4 Copyright 2009, Frederic Bregier, and individual contributors by the @author
5 tags. See the COPYRIGHT.txt in the distribution for a full listing of
6 individual contributors.
7
8 All GoldenGate Project is free software: you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as published
10 by the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
12
13 GoldenGate is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GoldenGate . If not, see <http://www.gnu.org/licenses/>.
20 */
21 package goldengate.common.cpu;
22
23 import com.jezhumble.javasysmon.CpuTimes;
24 import com.jezhumble.javasysmon.JavaSysMon;
25
26 /**
27 * @author bregier
28 *
29 */
30 public class CpuManagementSysmon implements CpuManagementInterface {
31 public static long delay = 1000;
32
33 JavaSysMon sysMon;
34
35 CpuTimes cpuTimesOld;
36 CpuTimes cpuTimesOldNext;
37 long time;
38
39 /**
40 *
41 * @throws UnsupportedOperationException
42 * if System Load Average is not supported
43 */
44 public CpuManagementSysmon() throws UnsupportedOperationException {
45 sysMon = new JavaSysMon();
46 cpuTimesOld = sysMon.cpuTimes();
47 cpuTimesOldNext = cpuTimesOld;
48 time = System.currentTimeMillis();
49 }
50
51 /**
52 *
53 * @return the load average
54 */
55 public double getLoadAverage() {
56 long newTime = System.currentTimeMillis();
57 CpuTimes cpuTimes = sysMon.cpuTimes();
58 double rate = cpuTimes.getCpuUsage(cpuTimesOld);
59 long delta = newTime - time;
60 if ((delta) > delay) {
61 if ((delta) > 10*delay) {
62 time = newTime;
63 cpuTimesOldNext = cpuTimes;
64 cpuTimesOld = cpuTimes;
65 } else {
66 time = newTime;
67 cpuTimesOldNext = cpuTimes;
68 cpuTimesOld = cpuTimesOldNext;
69 }
70 }
71 return rate;
72 }
73
74 public static void main(String[] args) {
75 long total = 0;
76 CpuManagementSysmon cpuManagement = new CpuManagementSysmon();
77 System.err.println("LA: " + cpuManagement.getLoadAverage());
78 for (int i = 0; i < 1000 * 1000 * 1000; i ++) {
79 // keep ourselves busy for a while ...
80 // note: we had to add some "work" into the loop or Java 6
81 // optimizes it away. Thanks to Daniel Einspanjer for
82 // pointing that out.
83 total += i;
84 total *= 10;
85 }
86 System.err.println("LA: " + cpuManagement.getLoadAverage());
87
88 total = 0;
89 for (int i = 0; i < 1000 * 1000 * 1000; i ++) {
90 // keep ourselves busy for a while ...
91 // note: we had to add some "work" into the loop or Java 6
92 // optimizes it away. Thanks to Daniel Einspanjer for
93 // pointing that out.
94 total += i;
95 total *= 10;
96 }
97 System.err.println("LA: " + cpuManagement.getLoadAverage());
98 try {
99 Thread.sleep(10000);
100 } catch (InterruptedException e) {
101 }
102 System.err.println("LA: " + cpuManagement.getLoadAverage());
103
104 total = 0;
105 for (int i = 0; i < 1000 * 1000 * 1000; i ++) {
106 // keep ourselves busy for a while ...
107 // note: we had to add some "work" into the loop or Java 6
108 // optimizes it away. Thanks to Daniel Einspanjer for
109 // pointing that out.
110 total += i;
111 total *= 10;
112 }
113 System.err.println("LA: " + cpuManagement.getLoadAverage());
114 }
115 }