question about total allocated memory

[Lisandro Dalcin]

On 6/29/07, Satish Balay <balay at mcs.anl.gov> wrote:
> > I heard that windows system doesn't allow 32 bits CPU allocating
> > more than 2GB. Is it also true under linux system?
>
> I belive its true for linux aswell.

Look at this link: http://linux-mm.org/HighMemory

"Currently the 32 bit x86 architecture is the most popular type of
computer. In this architecture, traditionally the Linux kernel has
split the 4GB of virtual memory address space into 3GB for user
programs and 1GB for the kernel."

[snip]

"The third issue is that, on a 32 bit system, no process will be able
to effectively use more than 3GB of memory. This means that buying
more than 4GB of memory is only useful if none of the processes on
your system need all of the memory"

-- 
Lisandro Dalcín
---------------
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
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