在java中监控每个线程的cpu使用情况？ [英] Monitor cpu usage per thread in java?

问题描述

我想问一下是否有一些简单的方法来确定java中每个线程的cpu使用率。谢谢

解决方案

我相信 getThreadCpuTime（）函数。

以下内容：

  long upTime = runtimeProxy.getUptime（）; 
列表< Long> threadCpuTime = new ArrayList< Long>（）; 
 for（int i = 0; i< threadIds.size（）; i ++）{
 long threadId = threadIds.get（i）; 
 if（threadId！= -1）{
 threadCpuTime.add（threadProxy.getThreadCpuTime（threadId））; 
} else {
 threadCpuTime.add（0L）; 
} 
} 
 int nCPUs = osProxy.getAvailableProcessors（）; 
列表< Float> cpuUsageList = new ArrayList< Float>（）; 
 if（prevUpTime> 0L&& upTime> prevUpTime）{
 // elapsedTime以ms为单位
 long elapsedTime = upTime  -  prevUpTime; 
 for（int i = 0; i< threadIds.size（）; i ++）{
 // elapsedCpu在ns 
 long elapsedCpu = threadCpuTime.get（i） -  prevThreadCpuTime.get （一世）; 
 // cpuUsage可能会高于100％，因为不会同时获取elapsedTime 
 //和elapsedCpu。限制为
 // 99％以避免图表显示从0％到200％的比例。 
 float cpuUsage = Math.min（99F，elapsedCpu /（elapsedTime * 1000000F * nCPUs））; 
 cpuUsageList.add（cpuUsage）; 
} 
} 
  

I would like to ask whether there is some simple way to determine cpu usage per thread in java. Thanks

解决方案

I believe the JConsole (archived link) does provide this kind of information through a plugin

It uses ThreadMXBean getThreadCpuTime() function.

Something along the line of:

        long upTime = runtimeProxy.getUptime();
        List<Long> threadCpuTime = new ArrayList<Long>();
        for (int i = 0; i < threadIds.size(); i++) {
            long threadId = threadIds.get(i);
            if (threadId != -1) {
                threadCpuTime.add(threadProxy.getThreadCpuTime(threadId));
            } else {
                threadCpuTime.add(0L);
            }
        }
        int nCPUs = osProxy.getAvailableProcessors();
        List<Float> cpuUsageList = new ArrayList<Float>();
        if (prevUpTime > 0L && upTime > prevUpTime) {
            // elapsedTime is in ms
            long elapsedTime = upTime - prevUpTime;
            for (int i = 0; i < threadIds.size(); i++) {
                // elapsedCpu is in ns
                long elapsedCpu = threadCpuTime.get(i) - prevThreadCpuTime.get(i);
                // cpuUsage could go higher than 100% because elapsedTime
                // and elapsedCpu are not fetched simultaneously. Limit to
                // 99% to avoid Chart showing a scale from 0% to 200%.
                float cpuUsage = Math.min(99F, elapsedCpu / (elapsedTime * 1000000F * nCPUs));
                cpuUsageList.add(cpuUsage);
            }
        }

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