Thanks, I'd normally read code to figure this kind of thing out but C++ is one of the few languages I have no clue with.
What I'll do then (I'm on RHEL) is install libcgroup, start cgconfig and see what happens with that new --isolation flag. Part of the reason I was asking is I wasn't clear that the tasks I'm sending out with RAM and CPU allocations on them are actually enforced out of the box - is that right? We're running Marathon and shipping out jobs with 256MbRAM/01.CPU requirements, and seems like the slaves are reporting used resources based on those numbers. I think it's a bit unlikely these random jobs are actually using exactly those resources, and so I wondered if we're enforcing it anywhere. On 9 June 2014 17:02, Jie Yu <[email protected]> wrote: > Hi Dick, > >> >> what croup isolation provides over stock posix / process isolation > > > Currently, mesos provides cpu and memory isolation through cgroups on Linux > boxes '--isolation=cgroups/cpu,cgroups/mem' > >> the configuration required to setup cgroups > > > If no other service on the host uses cgroup (no cgroup subsystems being > mounted), then it should be pretty simple because mesos will mount > corresponding subsystems for you. You can choose the root hierarchy using > the following slave flag: > > add(&Flags::cgroups_hierarchy, > "cgroups_hierarchy", > "The path to the cgroups hierarchy root\n", > "/sys/fs/cgroup"); > > If some services on the host are using cgroup (e.g, systemd), then it > depends on how cgroups are mounted. > > - Jie > > > > On Mon, Jun 9, 2014 at 3:09 AM, Dick Davies <[email protected]> wrote: >> >> So we're running with default isolation (posix) >> and thinking about enabling cgroups (mesos 0.17.0 >> right now but the upgrade to 0.18.2 was seamless >> in dev. so that'll probably happen too). >> >> I just need to justify the effort and extra complexity, >> so can someone explain briefly >> >> * what croup isolation provides over stock posix / process isolation >> * the configuration required to setup cgroups >> >> Thanks! > >
