process memory limitations

[Maimon Oded]

i'm aware that this is a fedora list, but my question is linux kernel
question, and i didnt want to get an answer that is true only to fedora
versions (because i know they got more limitations then others)

thanks for the answer...


On 1/23/06, Jonathan Berry <berryja at gmail.com> wrote:
>
> On 1/22/06, Oded Maimon <oded.maimon at gmail.com> wrote:
> > Hi,
> >
> > I've a question about per process memory allocation limitation.
>
> You do realize this is a list for Fedora, not RHEL, right?  Please
> point other RHEL questions to the RHEL list.  You will get more/better
> help there.
>
> > if i've a 32bit machine, with RHEL 4, what are the limitation of memory
> > that each process can allocate?
>
> That depends on if your kernel has the 4G/4G patch or not.  I think
> that patch floated in and out of the Fedora kernels for a while there.
> Anyway, if you do it is 4 GB.  Otherwise, I believe the split is 3 GB
> user 1 GB kernel, so 3 GB.
>
> > if i've a 64bit machine, with RHEL 4, and i'm using a 32bit program,
> > what are the limitation of memory that each process can allocate?
>
> That's an interesting question and I'm not sure.  But after thinking
> about it, pointers in a 32-bit program are, well, 32-bits wide.  So I
> don't see how it could possibly address more than 32-bits worth of
> space.  So my guess would be 4 GB again.  Now, a 64-bit program has a
> whole lot more.  I don't remember how much, but I doubt the exact
> number is relevant, as it is probably more space than any normal
> computer could handle : ).
>
> Also, these are address space limitations.  The limitation on the
> amount of memory a process can allocate depends also on the size of
> the text and stack needed.  ulimit may also be able to impose some
> limit as well, though I'm not familiar with all of its capabilities.
>
> Jonathan
>
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