How to analyze the performance bottleneck ceph

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hello everyone!
           I changed the ceph.conf file parameters to adjust the
performance of ceph.
I'm testing the performance through the fio tool.

           But I do not know the performance bottleneck in ceph which
module. And  can not be targeted to adjust the ceph.conf file
parameters.


           So,how to test ceph performance bottlenecks in which module?
           Please list some methods and tools.

thanks!
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