使用JMX获取线程CPU时间的有效方法 [英] Efficient way of getting thread CPU time using JMX

问题描述

我目前正在以下列方式使用JMX获取总线程CPU时间：

I'm currently getting the total thread CPU time using JMX in the following manner:

private long calculateTotalThreadCpuTime(ThreadMXBean thread) {

    long totalTime = 0l;

    for (ThreadInfo threadInfo : thread.dumpAllThreads(false, false))
        totalTime += thread.getThreadCpuTime(threadInfo.getThreadId());

    return totalTime;
}

由于ThreadMXBean实际上是一个远程代理，性能 dreadful ，这个实际方法调用的秒数量级。

As the ThreadMXBean is actually a remote proxy, performance is dreadful, in the order of magnitude of seconds for this actual method call.

有更快的方法吗？

更新：我正在使用它进行性能监控。测量结果是挂钟时间和JProfiler，显示我花费大约85％的时间用于此方法。我确实有一些其他MXBean调用（运行时，内存，GC），但它们便宜得多。很可能因为每次调用 thread.getThreadCpuTime 都是远程调用。

Update: I'm using this for performance monitoring. The measurements were both 'wall clock' time and JProfiler, which showed about 85% of my time spent in this method. I do have some other MXBean calls ( Runtime, Memory, GC ), but they are much cheaper. Most likely because every call to thread.getThreadCpuTime is a remote one.

更新2 ：显示性能问题的JProfiler屏幕截图。

Update 2: JProfiler screenshot showing the performance problems.

推荐答案

优化：

• 在线程池中调用getThreadCPUTime，因为它似乎是网络绑定的;


• 每当找到一个线程在 Thread.STATE.TERMINATED ，将其名称保存在地图中，并在下次跳过查询。

• invoke getThreadCPUTime inside a thread pool, since it seems to be network-bound;
• whenever a thread is found to be in Thread.STATE.TERMINATED, keep its name in a Map and skip querying the next time.

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