[jira] [Commented] (FLINK-18715) add cpu usage metric of jobmanager/taskmanager

["Till Rohrmann (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-18715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17165503#comment-17165503 ] 

Till Rohrmann commented on FLINK-18715:
---------------------------------------

Thanks for creating this ticket [~1026688210]. Isn't the CPU usage something you already get from K8s or other resource management systems? The problem I see with Flink trying to measure the CPU usage is that it neglects other processes running on the same machine. This could lead to Flink reporting a very low CPU usage even though the machine on which it is running is super busy.

> add cpu usage metric of  jobmanager/taskmanager  
> -------------------------------------------------
>
>                 Key: FLINK-18715
>                 URL: https://issues.apache.org/jira/browse/FLINK-18715
>             Project: Flink
>          Issue Type: Improvement
>          Components: Runtime / Metrics
>    Affects Versions: 1.11.1
>            Reporter: wgcn
>            Priority: Major
>             Fix For: 1.12.0, 1.11.2
>
>
> flink process add cpu usage metric,   user can determine that their job  is  io bound /cpu bound  ,so that they can increase/decrese cpu core in the container (k8s,yarn). If it's nessary 
> .  you can assign  it  to me  ，I come up with a idea  calculating cpu usage ratio using   ManagementFactory.getRuntimeMXBean().getUptime() and  ManagementFactory.getOperatingSystemMXBean().getProcessCpuTime  over a period of time .   it can get a value in single cpu core environment. and user can use the value  to calculate cpu usage ratio by dividing  num of container's cpu core.



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