[jira] [Commented] (MESOS-2713) Docker resource usage

["Timothy Chen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MESOS-2713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14536794#comment-14536794 ] 

Timothy Chen commented on MESOS-2713:
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At the time we did the integration we just wanted to use existing statistics code that's in Mesos, and I believe it was written to not assume cgroups is present.
I'm not aware that using sysctl stats will be inaccurate, it should be roughly the same as cgrups AFAIK.

> Docker resource usage 
> ----------------------
>
>                 Key: MESOS-2713
>                 URL: https://issues.apache.org/jira/browse/MESOS-2713
>             Project: Mesos
>          Issue Type: Bug
>          Components: containerization, docker, isolation
>    Affects Versions: 0.22.1
>            Reporter: Ian Babrou
>
> Looks like resource usage for docker containers on slaves is not very accurate (/monitor/statistics.json). For example, cpu usage is calculated by travesing process tree and summing up cpu times. Resulting numbers are not even close to real usage, CPU time can even decrease.
> What is the reason for this if you can use cgroup data directly? Reading cgroup location from pid of docker container is pretty straighforward.
> Another similar question: what is the reason to set isolation to posix instead of cgroups by default? Looks like it suffers from the same issues as docker containerizer (incorrect stats). More docs on this topic would be great.
> Posix isolation also leads to bigger CPU usage from mesos slave process (higher usage — posix isolation): http://i.imgur.com/jepk5m6.png



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