chenBright commented on PR #2207:
URL: https://github.com/apache/brpc/pull/2207#issuecomment-1506295981
在自己机器上测试了每个pthread线程一个独立的pthread_mutex，只执行加锁解锁操作，性能下降的量级是一样的。
```shell
I0413 11:46:11.933795 {} 15638 18446744073709551615
brpc_doubly_buffered_data_unittest.cpp:414 [PerfTest] thread_num=1
count=26259114 average_time=38.1216 qps=2.62318e+07
I0413 11:46:12.937870 {} 15638 18446744073709551615
brpc_doubly_buffered_data_unittest.cpp:414 [PerfTest] thread_num=4
count=4867834 average_time=823.195 qps=1.21478e+06
I0413 11:46:13.941736 {} 15638 18446744073709551615
brpc_doubly_buffered_data_unittest.cpp:414 [PerfTest] thread_num=8
count=4979021 average_time=1609.4 qps=621348
I0413 11:46:14.945895 {} 15638 18446744073709551615
brpc_doubly_buffered_data_unittest.cpp:414 [PerfTest] thread_num=12
count=5716892 average_time=2102.88 qps=475538
```
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