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SubjectRe: Memory intensive processes
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> > This is true. Also the act of READING zero-filled pages should not cause
> > a trap to the operating system. Many FFTs null-fill a lot of RAM and
> > certainly never write to it.
>
> Not a good idea. Implementing your suggestion would mean that large parts
> the page tables which are are just truncated off would have to be allocated
> and memory. Just mmaping 1gb from /dev/zero would cost you over 1mb of
> *not swappable* memory for page tables. Aside of that allocation and filling
> consumes a lot of time.

a very good idea since page tables are in virtual memory and swappable
themself in VMS...


Harald
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