jmx获取cpu时间

• Z时代
• 2024-01-10
• 分类：综合

import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.management.RuntimeMXBean;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.util.HashMap;
import java.util.Map;
public class Test {
	private int sampleTime = 10000;
	private ThreadMXBean threadMxBean = ManagementFactory.getThreadMXBean();
	private RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
	private OperatingSystemMXBean osMxBean = ManagementFactory.getOperatingSystemMXBean();
	private Map<Long, Long> threadInitialCPU = new HashMap<Long, Long>();
	private Map<Long, Float> threadCPUUsage = new HashMap<Long, Float>();
	private long initialUptime = runtimeMxBean.getUptime();
	public static void main(String[] args) {
		Thread thread = new Thread(new Runnable() {
			int j = 0;
			@Override
			public void run() {
				// TODO Auto-generated method stub
				for (int i = 0; i < 100000; i++) {
					j++;
					try {
						Thread.sleep(1);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
				System.out.println("运行完成>>>>>>>>>>");
			}
		});
		thread.setName("test>>");
		thread.start();
		new Test().test();
	}
	public void test() {
		ThreadInfo[] threadInfos = threadMxBean.dumpAllThreads(false, false);
		for (ThreadInfo info : threadInfos) {
			threadInitialCPU.put(info.getThreadId(), threadMxBean.getThreadCpuTime(info.getThreadId()));
		}
		try {
			Thread.sleep(sampleTime);
		} catch (InterruptedException e) {
		}
		long upTime = runtimeMxBean.getUptime();
		Map<Long, Long> threadCurrentCPU = new HashMap<Long, Long>();
		threadInfos = threadMxBean.dumpAllThreads(false, false);
		for (ThreadInfo info : threadInfos) {
			threadCurrentCPU.put(info.getThreadId(), threadMxBean.getThreadCpuTime(info.getThreadId()));
		}
		// CPU over all processes
		// int nrCPUs = osMxBean.getAvailableProcessors();
		// total CPU: CPU % can be more than 100% (devided over multiple cpus)
		long nrCPUs = 1;
		// elapsedTime is in ms.
		long elapsedTime = (upTime - initialUptime);
		for (ThreadInfo info : threadInfos) {
			// elapsedCpu is in ns
			Long initialCPU = threadInitialCPU.get(info.getThreadId());
			if (initialCPU != null) {
				long elapsedCpu = threadCurrentCPU.get(info.getThreadId()) - initialCPU;
				float cpuUsage = elapsedCpu / (elapsedTime * 1000000F * nrCPUs);
				threadCPUUsage.put(info.getThreadId(), cpuUsage);
			}
		}
		// threadCPUUsage contains cpu % per thread
		System.out.println(threadCPUUsage);
		// You can use osMxBean.getThreadInfo(theadId) to get information on every
		// thread reported in threadCPUUsage and analyze the most CPU intentive threads
		for(Long l :threadCPUUsage.keySet()) {
			Float float1 = threadCPUUsage.get(l);
			if(float1 > 0.0) {
				ThreadInfo threadInfo = threadMxBean.getThreadInfo(l,1000);
				System.out.println("id="+l+"  cpu:"+float1 + "theadName:"+threadInfo.getThreadName());
				StackTraceElement[] stackTrace = threadInfo.getStackTrace();
				if(stackTrace!=null && stackTrace.length > 0) {
					for(StackTraceElement s:stackTrace) {
						//System.out.println("method: "+s.getMethodName()+" line:"+s.getLineNumber());
						System.out.println(s.toString());
					}
				}
			}
		}
	}
}

https://docs.oracle.com/javase/8/docs/platform/jvmti/jvmti.html#GetStackTrace

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