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Date: Wed, 19 Jul 2017 22:44:00 +0000 (UTC)
From: "Reza Motamedi (JIRA)" <jira@apache.org>
To: issues@aurora.apache.org
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Subject: [jira] [Comment Edited] (AURORA-1939) Thermos landing (host) page
 reports incorrect CPU rates when it is busy
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archived-at: Wed, 19 Jul 2017 22:44:11 -0000


    [ https://issues.apache.org/jira/browse/AURORA-1939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16093862#comment-16093862 ] 

Reza Motamedi edited comment on AURORA-1939 at 7/19/17 10:43 PM:
-----------------------------------------------------------------

This seems to be totally related to psutil. I contacted the developers there.

https://github.com/giampaolo/psutil/issues/1110


was (Author: rezam):
This seems to be totally related to psutil. I contacted the developers there.

> 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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