Ian Babrou created MESOS-2713:
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Summary: 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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