如何获得CPU负荷的Linux百分之百精确和简单的方法？

概述如何获得CPU负荷的Linux百分之百精确和简单的方法？

您好我想获得cpu负载，但我想只得到cpu百分比的负载。 我有我的代码如下所示什么最简单的方法来获取它，因为我尝试使用networking代码埠

OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getoperatingSystemMXBean(); for (Method method : operatingSystemMXBean.getClass().getDeclaredMethods()) { method.setAccessible(true); if (method.getname().startsWith("get") && ModifIEr.isPublic(method.getModifIErs())) { Object value; try { value = method.invoke(operatingSystemMXBean); } catch (Exception e) { value = e; } // try System.out.print(method.getname() + " = " + value);

希望你的回复

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最好使用Sigar API，您可以使用它来提取不同的指标。 我也用这个为我的应用程序，你可以参考下面的链接

http://support.hyperic.com/display/SIGAR/Home

创建一个计时器，并每秒获取所有线程cpu时间的总和。 也许这样：

long cpuTime = 0; for (long ID : ManagementFactory.getThreadMXBean ().getAllThreadIDs ()) { cpuTime += ManagementFactory.getThreadMXBean ().getThreadcpuTime (ID); }

cpu的百分比就是上一次和当前秒之间的相对cpu时间除以时间戳差值。

下面是一个cpuStats类的简单示例实现：

public class cpuStats { private final long threadID; private long lastcpuTime = 0; private long lastPoll = 0; /** * Creates a cpuStats object for a single thread. * @param threadID The ID of the thread to monitor * */ public cpuStats (long threadID) { this.threadID = threadID; lastcpuTime = getTotalTime (); lastPoll = System.nanoTime (); } /** * Creates a cpuStatus object for all threads. The supplIEd statistics affect * all threads in the current VM. */ public cpuStats () { threadID = -1; lastcpuTime = getTotalTime (); lastPoll = System.nanoTime (); } private long getrelativeTime () { long currentcpuTime = getTotalTime (); long ret = currentcpuTime - lastcpuTime; lastcpuTime = currentcpuTime; return ret; } public double getUsage () { long timeBefore = this.lastPoll; lastPoll = System.nanoTime (); long relTime = getrelativeTime (); return Math.max ((double)relTime / (double)(lastPoll - timeBefore),0.0); } private long getTotalTime () { if (threadID == -1) { long cpuTime = 0; for (long ID : ManagementFactory.getThreadMXBean ().getAllThreadIDs ()) { cpuTime += ManagementFactory.getThreadMXBean ().getThreadcpuTime (ID); } return cpuTime; } else { return ManagementFactory.getThreadMXBean ().getThreadcpuTime (threadID); } } }

只要定期检索getUsage() 。

这个使用mpstat代码可能是一个解决方案

import java.io.*; public class cpuLoad { public static voID main(String args[]) { int i=1; float finalres; try{ // execute the linux command Process p=Runtime.getRuntime().exec("mpstat"); BufferedReader in=new BufferedReader(new inputStreamReader(p.getinputStream())); String line=null; //read the row corresponding to cpu IDle while((line=in.readline())!=null && i<4){ i++; } String res=line.substring(line.length()-5); finalres=float.parsefloat(res); //convert the IDle to cpuload System.out.println("cpu load:"+(100-finalres)+"%"); } catch(Exception e){ System.out.println(e); } } }

资源

你可以使用这个类：

import com.sun.management.OperatingSystemMXBean; import java.lang.management.ManagementFactory; public class PerformanceMonitor { static long lastSystemTime = 0; static long lastProcesscpuTime = 0; static int availableProcessors = ManagementFactory.getoperatingSystemMXBean().getAvailableProcessors(); public synchronized double getcpuUsage() { if ( lastSystemTime == 0 ) { baselineCounters(); // return ; } long systemTime = System.nanoTime(); long processcpuTime = 0; if ( ManagementFactory.getoperatingSystemMXBean() instanceof com.sun.management.OperatingSystemMXBean ) { processcpuTime = ( (com.sun.management.OperatingSystemMXBean) ManagementFactory.getoperatingSystemMXBean() ).getProcesscpuTime(); } double cpuUsage = (double) (processcpuTime - lastProcesscpuTime ) / ( systemTime - lastSystemTime )*100.0; lastSystemTime = systemTime; lastProcesscpuTime = processcpuTime; return cpuUsage / availableProcessors; } private voID baselineCounters() { lastSystemTime = System.nanoTime(); if ( ManagementFactory.getoperatingSystemMXBean() instanceof com.sun.management.OperatingSystemMXBean ) { lastProcesscpuTime = ( (com.sun.management.OperatingSystemMXBean) ManagementFactory.getoperatingSystemMXBean() ).getProcesscpuTime(); } } }

然后打电话给：

public class Main { public static PerformanceMonitor monitor = null; public static voID main(String[] args) { monitor = new PerformanceMonitor(); for(int i=0 ; i<10000 ; i++){ start(); double usage = monitor.getcpuUsage(); if(usage!=0)System.out.println("Current cpu usage in pourcentage : "+usage); } } private static voID start() { int count=0; for(int i=0 ; i<100000 ; i++){ count=(int) Math.random()*100; } } }

你也可以看看其他的监控方法，希望能帮到你！

编辑:(新的性能监视器）

import java.lang.management.ManagementFactory; public class PerformanceMonitor { static long lastSystemTime = 0; static long lastProcesscpuTime = 0; public static int availableProcessors = ManagementFactory.getoperatingSystemMXBean().getAvailableProcessors(); public synchronized double getcpuUsage() { ManagementFactory.getThreadMXBean().setThreadcpuTimeEnabled(true); if ( lastSystemTime == 0 ) { baselineCounters(); // return ; } long systemTime = System.nanoTime(); long processcpuTime = 0; processcpuTime = ManagementFactory.getThreadMXBean().getCurrentThreadcpuTime(); double cpuUsage = (double) (processcpuTime - lastProcesscpuTime ) / ( systemTime - lastSystemTime )*100.0; lastSystemTime = systemTime; lastProcesscpuTime = processcpuTime; return cpuUsage / availableProcessors; } private voID baselineCounters() { lastSystemTime = System.nanoTime(); lastProcesscpuTime = ManagementFactory.getThreadMXBean().getCurrentThreadcpuTime(); } }

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