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From "Lou DeGenaro (JIRA)" <...@uima.apache.org>
Subject [jira] [Commented] (UIMA-5047) UIMA-DUCC: refactor agent code which gathers node and process metrics
Date Tue, 25 Oct 2016 20:40:58 GMT

    [ https://issues.apache.org/jira/browse/UIMA-5047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15606422#comment-15606422
] 

Lou DeGenaro commented on UIMA-5047:
------------------------------------

Support cgroups cpu reporting on WS Machines page:

- MachineFacts
- MachineFactsTest
- DuccMachinesData
- MachneInfo
- DuccHandlerClassic
- DuccHandlerJsonFormat

> UIMA-DUCC: refactor agent code which gathers node and process metrics
> ---------------------------------------------------------------------
>
>                 Key: UIMA-5047
>                 URL: https://issues.apache.org/jira/browse/UIMA-5047
>             Project: UIMA
>          Issue Type: Improvement
>          Components: DUCC
>            Reporter: Jerry Cwiklik
>            Assignee: Jerry Cwiklik
>             Fix For: 2.2.0-Ducc
>
>
> Currently agent fetches metrics from different sources including /proc file system, top,
ps, etc. The files found in /proc file system don't have fixed structure across Linux platforms
causing some metrics to be missing or be wrong. Also scrapping lnx commands may not be 100%
reliable as well
> Change the code to fetch CPU metrics from cgroups. For reporting the CPU, the agent needs
to look at cgroups cpuacct.stat file.
> Agent will collect process CPU usage when 
>      a) cgroups  are ON.   
>      b) cgroups accounting is configured in cgconfig
>      
>     Agent publishes -1 ( read: N/A) if cgroups are OFF or accounting is OFF.
> Agent will:
>      a) fetch the CPU from cgroups accounting as a sum of CPU spent in both user and
system mode.
>           These are separately maintained counts in cgroups.
>      b) agent should publish delta (subtracting current from previous reading)
>    
> Agent will continue to include two CPU values as part of its inventory publication: 
>     1) Total CPU used by a process from the time it started. This value is used by the
webserver to show CPU usage when a process terminates.
>     2) "Current" CPU used be a process. This is a delta computed as described in 2c above.
This value is shown by the webserver while the process is running.



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