On Tue, Apr 23, 2002 at 09:40:11PM -0700, David Schultz

> > Userspace processes will allocate memory from UVA space and can
> > grow over 1GB of size if needed by swapping.  You can certainly
> > have more than one over-1GB process going on at the same time,
> > but swapping will constrain your performance.
> It isn't a performance constraint.  32-bit architectures have
> 32-bit pointers, so in the absence of segmentation tricks, a
> virtual address space can only contain 2^32 = 4G locations.  If
> the kernel gets 3 GB of that, the maximum amount of memory that
> any individual user process can use is 1 GB.  If you had, say, 4
> GB of physical memory, a single user process could not use it all.
> Swap increases the total amount of memory that *all* processes can
> allocate by pushing some of the pages out of RAM and onto the
> disk, but it doesn't increase the total amount of memory that a
> single process can address.

Thank you, Terry and David, now I grasp how it should work (I hope).
I really miss some education, but that's life.

Vallo Kallaste

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