Java应用程序中的高CPU利用率 - 为什么？ [英] High CPU Utilization in java application - why?

问题描述

我有一个Java应用程序（基于Web），有时会显示非常高的CPU利用率（几乎90％）几个小时。 Linux TOP 命令显示了这一点。在重新启动应用程序时，问题就会消失。

I have a Java Application (web-based) that at times shows very high CPU Utilization (almost 90%) for several hours. Linux TOP command shows this. On application restart, the problem goes away.

所以要调查 ：

So to investigate:

我使用Thread Dump来查找正在执行的线程。在'RUNNABLE'状态中可以找到多个线程，其中一些在其他几个状态中。在重复的线程转储中，我确实看到一些线程始终存在于'RUNNABLE'状态。所以，他们似乎是罪魁祸首。

I take Thread Dump to find what threads are doing. Several Threads are found in 'RUNNABLE' state, some in few other states. On taking repeated Thread Dumps, i do see some threads that are always present in 'RUNNABLE' state. So, they appear to be the culprit.

但我无法确定，哪个Thread正在占用CPU或进入无限循环（从而导致高CPU util）。

But I am unable to tell for sure, which Thread is hogging the CPU or has gone into a infinite loop (thereby causing high CPU util).

日志不一定有用，因为有问题的代码可能没有记录任何内容。

Logs don't necessarily help, as the offending code may not be logging anything.

我如何调查 - 应用程序的哪个部分或什么线程导致高CPU利用率？ - 任何其他想法？

How do I investigate - What part of the application or what-thread is causing High CPU Utilization? - Any other ideas?

推荐答案

如果您的设置中不适用于探查器，您可以尝试在这篇文章。

If a profiler is not applicable in your setup, you may try to identify the thread following steps in this post.

基本上，有三个步骤：

1. 运行 top -H 并获取具有最高CPU的线程的PID。


2. 将PID转换为十六进制。


3. 在你的线程转储中寻找具有匹配HEX PID的线程。

1. run top -H and get PID of the thread with highest CPU.
2. convert the PID to hex.
3. look for thread with the matching HEX PID in your thread dump.

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