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Message-ID: <20050516125526.82482.qmail@web60512.mail.yahoo.com>
Date: Mon, 16 May 2005 05:55:26 -0700 (PDT)
From: li nux <lnxluv@yahoo.com>
Subject: Re: How to use memory over 4GB
To: Roberto Fichera <kernel@tekno-soft.it>, linux-kernel@vger.kernel.org
In-Reply-To: 6667
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I guess u r on 32-bit platform.
Then, u need to enable PAE ( if not enabled alredy)
and rebuild the kernel.
This will be transparent to the user space.
Ur word size will still be 32-bit, only thing is PAE
will change the way u translate the address by adding
one more level of indexing to the page table.

-lnxluv.

--- Roberto Fichera <kernel@tekno-soft.it> wrote:
> Hi All,
> 
> I've a dual Xeon 3.2GHz HT with 8GB of memory
> running kernel 2.6.11.
> I whould like to know the way how to use all the
> memory in a single
> process, the application is a big simulation which
> needs big memory chuncks.
> I have readed about hugetlbfs, shmfs and tmpfs, but
> don't understand how I 
> can access
> the whole memory. Ok! I can create a big file on
> tmpfs using shm_open() and
> than map it by using mmap() or mmap2() but how can I
> access over 4GB using
> standard pointers (if I had to use it)?
> 
> So, please send me some url, documents etc and/or
> piece
> of source code that shows how to do it in user
> space.
> 
> Thanks _very much_ in advance,
> 
> Roberto Fichera. 
> 
> -
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