Re: Size of Vector limited to 1024 MB of Heap Size

[Adam Beneschan <adam@irvine.com>]

On Jun 24, 1:44 am, Dennis Hoppe <dennis.ho...@hoppinet.de> wrote:
> Hi,
>
> my machine has 4 GB of RAM and I am wondering, why I can't use
> at least 2 or 3 GBytes to run an Ada program.

Well, if you were using Windows, I'd guess this is because Windows
reserves about 3.98 GB of your RAM for itself.  But I notice that you
said further on down that you were using Linux, so the heck with that
answer........

>  It seems, that my
> Ada Compiler (Gnat 4.4.0) limit the memory to 2 GB per default.
> Is it possible to allocate more than 2 GB?

I don't know GNAT intimately, and I don't work on it.  But 2 GB =
2**31 bytes, and the largest possible value of a signed 32-bit integer
is 2**31-1.  So if their runtime is using 32-bit integers to hold
values like that, there may be no way to deal with larger memory
amounts without a rewrite of the runtime.

                               -- Adam