[jira] [Assigned] (AURORA-1939) Thermos landing (host) page reports incorrect CPU rates when it is busy

["Reza Motamedi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AURORA-1939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reza Motamedi reassigned AURORA-1939:
-------------------------------------

    Assignee: Reza Motamedi

> 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
>            Assignee: 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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