More then 2G of memory per process

Philippe Gramoullé philippe.gramoulle at
Thu Aug 7 06:05:42 CDT 2003

Hello Bill,

You can find some information on the 4G/4G patch here:

and the patch itself here:



On 06 Aug 2003 18:09:22 -0400
Bill Rankin <wrankin at> wrote:

  | From: Matt Domsch <Matt_Domsch at>
  | > > I'm running an application that was developed in house. We are starting
  | > > to exceed the limit of approximately 2 gigs of memory per application.
  | > > Are there any options that will allow us to increase this limit?
  | > 
  | > Red Hat Enterprise Linux 3 public beta "Taroon" has a 'bigmem' kernel 
  | > which implements a 4GB kernel / 4GB user memory split.  This increases the 
  | > amount of address space available to user processes from 3GB to just under 
  | > 4GB, which should help a good bit.  It *really* helps the kernel, as it 
  | > now gets 4GB of address space, up from 1GB previously.
  | Can you elaborate (or post a URL) with the details of this enhancement?
  | I am very interested in seeing where this memory getts freed from and
  | how we can use it to get around the 1-2 GB limit on contiguous data
  | structures (in FORTRAN).
  | Thanks,
  | -bill
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