Re: Address Space Limit - 2.25GB Per Process?
Re: Address Space Limit - 2.25GB Per Process?
- Subject: Re: Address Space Limit - 2.25GB Per Process?
- From: Umesh Vaishampayan <email@hidden>
- Date: Thu, 31 Oct 2002 18:12:44 -0800
On Thursday, October 31, 2002, at 02:22 AM, Jeremy T. Fox wrote:
>
I tried to find the most memory I could allocate via Fortran (g77) and
>
I got 2.25GB (on a G4 with 512MB of physical memory). Does Mac OS X
>
have a limit of 2.25GB per process, or is this something strange with
>
Fortran and/or my machine?
>
>
For comparison, Windows has a limit of 2GB per process (tunable to 3GB
>
if you shell out for Advanced Server), while I believe the default on
>
Linux is 3GB, which can be upgraded to 3.5GB with the right patch. I
>
don't know about FreeBSD. Clearly 64-bit machines do not have this
>
type of limitation.
>
>
Jeremy, who hopes that one day Apple will support 1GB DIMMs :)
>
>
--------------------
>
Jeremy T. Fox
>
email@hidden
Each user process can have 4GB - 4K of VM address space. However you do
not have a larger than 1.5GB "hole" in that address space. If g77 must
work in "contiguous VM", I think 1.5GB is the limit you will have to
work in.
--Umesh
--
Umesh Vaishampayan Apple Computer, Inc.
Mac OS X Kernel Ph: (408) 974 0229
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