On 15 Mar 2000, Rask Ingemann Lambertsen wrote:
> Den 13-Mar-00 22:16:31 skrev James Sutherland følgende om "Re: Overcomittable memory (Was: Linux 2.2.15pre12)":
>
> > If you REALLY want to allow for the worst case: Each process has an
> > address space of 3 Gb (+1Gb kernel). Your method would require, for a
> > sytem with a hard limit of 1024 processes, a minimum of 3Tb swap+RAM. You
> > can try this if you want, but I don't think many people will follow this.
>
> Somewhere along the line you misunderstood something fundamental. What
> it is that makes you conclude that you cannot have a system with no
> overcomitment of memory and, say, 64 MiB RAM + swap combined and a hard
> limit of 4096 processes?
You can. The trouble is, unless each process has a hard limit of just
under 64Kb, you can still run out of memory. With COW overcommit, you
could fit 100 20Mb Apache processes in that 64Mb - without it, you could
barely fit three. I know which I would opt for.
James.
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