Balbir Singh wrote: > Pavel Emelianov wrote: >> Balbir Singh wrote: >>> Dave Hansen wrote: >>>> On Fri, 2006-09-08 at 11:33 +0400, Pavel Emelianov wrote: >>>>> I'm afraid we have different understandings of what a "guarantee" is. >>>> It appears so. >>>> >>>>> Don't we? >>>>> Guarantee may be one of >>>>> >>>>> 1. container will be able to touch that number of pages >>>>> 2. container will be able to sys_mmap() that number of pages >>>>> 3. container will not be killed unless it touches that number of >>>>> pages >>>> A "death sentence" guarantee? I like it. :) >>>> >>>>> 4. anything else >>>>> >>>>> Let's decide what kind of a guarantee we want. >>> I think of guarantees w.r.t resources as the lower limit on the >>> resource. >>> Guarantees and limits can be thought of as the range (guarantee, limit] >>> for the usage of the resource. >>> >>>> I think of it as: "I will be allowed to use this many total pages, and >>>> they are guaranteed not to fail." (1), I think. The sum of all of >>>> the >>>> system's guarantees must be less than or equal to the amount of free >>>> memory on the machine. >>> Yes, totally agree. >> >> Such a guarantee is really a limit and this limit is even harder than >> BC's one :) >> >> E.g. I have a node with 1Gb of ram and 10 containers with 100Mb >> guarantee each. >> I want to start one more. What shall I do not to break guarantees? > > Don't start the new container or change the guarantees of the existing > ones > to accommodate this one :) The QoS design (done by the administrator) > should > take care of such use-cases. It would be perfectly ok to have a container > that does not care about guarantees to set their guarantee to 0 and set > their limit to the desired value. As Chandra has been stating we need two > parameters (guarantee, limit), either can be optional, but not both. If I set up 9 groups to have 100Mb limit then I have 100Mb assured (on 1Gb node) for the 10th one exactly. And I do not have to set up any guarantee as it won't affect anything. So what a guarantee parameter is needed for?
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