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SubjectRe: Overcomittable memory
Date
On Sat, 18 Mar 2000 12:45:35 -0600, you wrote:

>On Fri, Mar 17, 2000 at 10:10:23AM +0000, James Sutherland wrote:
>> Yes, you COULD have COW without overcommitting - but you still lose one of
>> the major benefits of COW, namely huge savings on VM usage. If I fork()
>> 100 Apache processes of 20Mb each, I need perhaps 30Mb of VM total.
>> WITHOUT overcommitted COW, I end up needing 2Gb of swap space - 1.98Gb of
>> which I will never use! This is certainly not an efficient use of swap
>> space, IMO...
>
>This is why god gave us segments. Can share the code; just have room for
>the data.
>
>Actually, I suppose it would be possible to know how much is code not
>likely to change (runtime loadable modules), and not have to commit for
>that.

Or just commit based on the memory which is really being used by the
process, which is nice and simple, and hasn't caused any problems I
know of yet.

It works - why change it?


James.

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