I did experiments and a minimal amount of surface research on this and found out the following items at least tangentially related to OPs question:
1. CGroups treats paged-in memory mapped files TOWARDS your memory limit, even if they are mapped shared. I have not yet tested what happens if tasks from different cgroups map the same file, but it *might* over account memory usage in such a case. 2. CPUs really stands for CPUshares. (assuming you don't enable CFS limiting) If you give a task 0.1 or 1M CPU shares it won't make a difference until the resource is under contention, only then will the CFS enforce the share ratio. 3. Linux kernel has overcommitting of memory https://www.kernel.org/doc/Documentation/vm/overcommit-accounting but I have not experimented with tweaking this setting and adjusting mesos resources. Cheers, Charles Allen On Sat, Apr 11, 2015 at 1:41 AM, Adam Bordelon <[email protected]> wrote: > See also the Optimistic Offers JIRA: > https://issues.apache.org/jira/browse/MESOS-1607 > > On Fri, Apr 10, 2015 at 12:21 PM, Benjamin Mahler < > [email protected]> wrote: > >> There is a really stale one here: >> https://issues.apache.org/jira/browse/MESOS-354 >> >> It's either going to get converted to an epic, or we can replace it with >> a fresh epic with a design and eventually a work breakdown. Add yourself to >> the watchers for updates. >> >> On Fri, Apr 10, 2015 at 12:03 PM, Tom Arnfeld <[email protected]> wrote: >> >>> Is there a ticket for this specific bit of work, Ben? >>> >>> -- >>> >>> Tom Arnfeld >>> Developer // DueDil >>> >>> (+44) 7525940046 >>> 25 Christopher Street, London, EC2A 2BS >>> >>> >>> On Fri, Apr 10, 2015 at 6:28 PM, Eduardo Jiménez <[email protected]> >>> wrote: >>> >>>> Hi, >>>> >>>> Does mesos today overcommit server resources if the current offers that >>>> have been accepted are not being used? >>>> >>>> I have cpu/mem cgroup isolators turned on, and I see the cluster >>>> running out of resources to offer, even if the applications accepting the >>>> current offers aren't fully using them. I'm wondering if choosing to enable >>>> the isolators causes this behavior. >>>> >>>> Thanks, >>>> >>>> Eduardo >>>> >>>> >>>> >>> >> >
