Article on Unixlib

Christian Ludlam chris at
Wed Jan 5 07:01:03 PST 2005

On 5 Jan Nick Burrett wrote:

> Peter Naulls said:
> > In message <3e707d284d.peter at>
> >           Peter Naulls <peter at> wrote:
> >
> >> I don't think there's any meaningful limit on the number; but problems
> >> arise when a program indicates that a DA may expand considerably.  You
> >> can then exhaust physical address space quickly.
> >                    ^^^^^^^^
> > Logical, of course.
> Presumably if we all had a copy of Clare's Virtualise software, then this
> would be a non-issue.

Alas not. The problem is the Dynamic Areas aren't paged with applications, so
share the same memory map. If enough people (ie. about 4) create huge dynamic
areas, you run out of logical address space even if there's no actual memory
paged into any of them.

Christian Ludlam
chris at

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