[I] bthread_worker_usage这个统计值为何有时候会超时bthread (brpc)

[via GitHub]

zc08291161 opened a new issue, #2640:
URL: https://github.com/apache/brpc/issues/2640

   **Describe the bug (描述bug)**
   在brpc的统计页面上，很容易就发现bthread_worker_usage的值
   超过bthread_worker_count,理论上根据代码，bthread_worker_usage
   的值不会超过TaskGroup的个数，因为代码
   double TaskControl::get_cumulated_worker_time() {
       int64_t cputime_ns = 0;
       BAIDU_SCOPED_LOCK(_modify_group_mutex);
       const size_t ngroup = _ngroup.load(butil::memory_order_relaxed);
       for (size_t i = 0; i < ngroup; ++i) {
           if (_groups[i]) {
               cputime_ns += _groups[i]->_cumulated_cputime_ns;
           }
       }
       return cputime_ns / 1000000000.0;
   }
   
   这个函数是一秒钟统计一次，如果定时器完全准的话，一定不会超过ngroup的个数
   因此这个值是否强依赖定时器，因而不一定完全准确，是否应该将
    cputime_ns / 1000000000.0;
   更改为 cputime_ns / （real_elapse_time）;其中real_elapse_time是这个函数两次
   调用的时间差。
   
   **To Reproduce (复现方法)**
   
   
   **Expected behavior (期望行为)**
   
   
   **Versions (各种版本)**
   OS:
   Compiler:
   brpc: 1.0.0
   protobuf:
   
   **Additional context/screenshots (更多上下文/截图)**
   
![image](https://github.com/apache/brpc/assets/34310804/0d5aa8eb-92bc-46b0-ba57-0065fed4553d)
   
   


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