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From "Reza Motamedi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AURORA-1939) Thermos landing (host) page reports incorrect CPU rates when it is busy
Date Mon, 26 Jun 2017 17:08:00 GMT
Reza Motamedi created AURORA-1939:
-------------------------------------

             Summary: Thermos landing (host) page reports incorrect CPU rates when it is busy
                 Key: AURORA-1939
                 URL: https://issues.apache.org/jira/browse/AURORA-1939
             Project: Aurora
          Issue Type: Bug
            Reporter: Reza Motamedi
            Priority: Minor


Thermos Observer uses `psutil` to monitor resource consumption of Thermos Processes. On a
busy machine, I have noticed negative CPU values when visiting the Thermos landing page.

In my test I reproduced this by starting many processes that constantly create short lived
children. This indicates that in time between `process_collector_psutil` looks up the Process
children and the time it calculates the CPU time the pid of the child is actually reused by
another much younger process, which leads to negative CPU times.



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