1 package storm.scheduler;
2
3 import java.lang.management.ManagementFactory;
4 import java.lang.management.ThreadMXBean;
5 import java.util.HashMap;
6 import java.util.Map;
7 import java.util.Set;
8
9 import cpuinfo.CPUInfo;
10
11 /**
12 * 负载监视器
13 * @author wxweven
14 * @version 1.0
15 * @email wxweven@qq.com
16 * @blog http://wxweven.com
17 * @Copyright: Copyright (c) wxweven 2009 - 2016
18 */
19 public class LoadMonitor {
20
21 private static final int SECS_TO_NANOSECS = 1000000000;
22 private static LoadMonitor instance = null;
23 private final long cpuSpeed; // Hz
24 Map loadHistory;
25
26 public static LoadMonitor getInstance() {
27 if (instance == null) {
28 instance = new LoadMonitor();
29 }
30 return instance;
31 }
32
33 private LoadMonitor() {
34 cpuSpeed = CPUInfo.getInstance().getCoreInfo(0).getSpeed();
35 }
36
37 public Map getLoadInfo(Set threadIds) {
38 // get current load
39 Map currentLoadInfo = new HashMap();
40 ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
41 for (long id : threadIds) {
42 currentLoadInfo.put(id, threadBean.getThreadCpuTime(id));
43 }
44
45 // compute difference wrt history
46 Map loadInfo = new HashMap();
47 for (long id : threadIds) {
48 // Long oldObj = (loadHistory != null)?loadHistory.get(id):0;
49 // long old = (oldObj != null)?oldObj.longValue():0;
50 long old = 0;
51 if (loadHistory != null && loadHistory.get(id) != null) {
52 old = loadHistory.get(id);
53 }
54 double deltaTime = (double)(currentLoadInfo.get(id) - old) / SECS_TO_NANOSECS; // sec
55 loadInfo.put(id, (long)(deltaTime * cpuSpeed));
56 }
57
58 // replace history with current
59 loadHistory = currentLoadInfo;
60
61 return loadInfo;
62 }
63 }
Original: https://www.cnblogs.com/wxweven/p/5517194.html
Author: wxweven
Title: Storm4
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