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SubjectRe: Overcommitable memory??
Horst von Brand <>:
> David Whysong <> said:
> [...]
> > Preventing system OOM using resource limits is equivalent to disabling
> > overcommit. You have to restrict each of N users to 1/N of the total
> > system memory.
> So you have 500 accounts, each one gets to use 1/500th of the (be very
> generous!) 2Gb VM. What if a batch of 50 new accounts shows up? Everybody
> gets the quota cut down 10%?

I believe the "N" referrs to N concurrent users.

> There are usually 10 active accounts, each one gets 200Mb. What if the 11th
> logs in? Start killing off processes of the people that were using exactly
> their share of the memory ATM?

The 11th gets an "insufficient resourcess currently available for login"

> Resource limits per user are orthogonal to overcommit. You could very well
> limit Jane Random User to 300Mb, as long as the system is able to provide
> it. You can overcommit or not, but in no case can Jane use more than her
> limit.

Jesse I Pollard, II

Any opinions expressed are solely my own.

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