Messages in this thread |  | | Subject | Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added user memory) | From | Chandra Seetharaman <> | Date | Mon, 11 Sep 2006 11:44:22 -0700 |
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On Mon, 2006-09-11 at 10:56 +0400, Pavel Emelianov wrote:
<snip>
> >> 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.
In the first place system administrator should not be configuring it that way, Then they are using it as a strict hard limit than guarantee (as the resources guaranteed to one container is _not_ available to others).
Besides, the above configuration is clearly _not_ work conservative.
They should use both guarantee and limit to associate resources to a container/RG.
> I want to start one more. What shall I do not to break guarantees?
CKRM/RG handles it this way:
Amount of a resource a child RG gets is the ratio of its share value to the parent's total # of shares. Children's resource allocation can be changed just by changing the parent's total # of shares.
If you case about initial situation would be: Total memory in the system 100MB parent's total # of shares: 100 (1 share == 1MB) 10 children with # of shares: 10 (i.e each children has 10MB)
When I want to add another child, just change parent's total # of shares to be say 125: Total memory in the system 100MB parent's total # of shares: 125 (1 share == 0.8MB) 10 children with # of shares: 10 (i.e each children has 8MB) Now you are left with 25 shares (or 20MB) that you can assign to new child(ren) as you please.
<snip> --
---------------------------------------------------------------------- Chandra Seetharaman | Be careful what you choose.... - sekharan@us.ibm.com | .......you may get it. ----------------------------------------------------------------------
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