[ https://issues.apache.org/jira/browse/MESOS-2103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chi Zhang updated MESOS-2103: ----------------------------- Shepherd: Ian Downes > Expose number of processes and threads in a container > ----------------------------------------------------- > > Key: MESOS-2103 > URL: https://issues.apache.org/jira/browse/MESOS-2103 > Project: Mesos > Issue Type: Improvement > Components: isolation > Affects Versions: 0.20.0 > Reporter: Ian Downes > Assignee: Chi Zhang > Labels: twitter > > The CFS cpu statistics (cpus_nr_throttled, cpus_nr_periods, > cpus_throttled_time) are difficult to interpret. > 1) nr_throttled is the number of intervals where *any* throttling occurred > 2) throttled_time is the aggregate time *across all runnable tasks* (tasks in > the Linux sense). > For example, in a typical 60 second sampling interval: nr_periods = 600, > nr_throttled could be 60, i.e., 10% of intervals, but throttled_time could be > much higher than (60/600) * 60 = 6 seconds if there is more than one task > that is runnable but throttled. *Each* throttled task contributes to the > total throttled time. > Small test to demonstrate throttled_time > nr_periods * quota_interval: > 5 x {{'openssl speed'}} running with quota=100ms: > {noformat} > cat cpu.stat && sleep 1 && cat cpu.stat > nr_periods 3228 > nr_throttled 1276 > throttled_time 528843772540 > nr_periods 3238 > nr_throttled 1286 > throttled_time 531668964667 > {noformat} > All 10 intervals throttled (100%) for total time of 2.8 seconds in 1 second > ("more than 100%" of the time interval) > It would be helpful to expose the number of processes and tasks in the > container cgroup. This would be at a very coarse granularity but would give > some guidance. -- This message was sent by Atlassian JIRA (v6.3.4#6332)