Re: [Boost-users] [iostream] Problems opening large mapped_file

Subject: Re: [Boost-users] [iostream] Problems opening large mapped_file
From: Vitaly Budovski (vbudovski+news_at_[hidden])
Date: 2012-08-07 00:38:10

On 7 August 2012 02:43, Heiko Klein <Heiko.Klein_at_[hidden]> wrote:
> Hi,
>
> I wanted to test the mapped_file_source iostream device. My code is working
> well with a normal file_source device and files >= 6GB. When I change the
> constructor to a mapped_file_source, it works still well for smaller files
> (e.g. 150MB), but for files > 2GB I get (tested with 2.5GB):
>
> exception occured: failed getting file size: Value too large for defined
> data type
>
>
> And for files > 4GB (tested with 6GB) I get:
>
> exception occured: failed opening file: Bad file descriptor
>
>
>
> My constructor is as follows:
>
>         using namespace boost::iostreams;
>         typedef stream<mapped_file_source> mmStream;
>         mmStream* mmistream = new mmStream();
>         mmistream->open(mapped_file_source(fileName));
>
>
>
> I've tested against boost 1.44 and a 32bit linux (Ubuntu 10.04).
>
>
> Are these general mmap problems, or am I missing some flags for
> mapped_file_source?
>
> Best regards,
>
> Heiko
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Hello,

32bit systems have only approximately 3GB of user addressable memory.
You should upgrade to a 64bit system.

Regards,

Vitaly