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From: Dennis Hoppe <dennis.hoppe@hoppinet.de>
Newsgroups: comp.lang.ada
Subject: Size of Vector limited to 1024 MB of Heap Size
Date: Tue, 24 Jun 2008 10:44:54 +0200
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Date: 2008-06-24T10:44:54+02:00
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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. 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?

Here is a simple example of an "evil" vector, that gains
more memory in each pass. The program terminates exactly at
1024 MB of used Heap memory.


with Ada.Containers.Vectors;

procedure Heap is
   package Generic_Vector is new Ada.Containers.Vectors
     (Element_Type => Integer, Index_Type => Natural);
		
   Evil_Vector : Generic_Vector.Vector;
begin -- Heap
   loop
     Generic_Vector.Append (Evil_Vector, Integer'Last);
   end loop;
end Heap;


heap(6374) malloc: *** mmap(size=2147487744) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug

raised STORAGE_ERROR : heap exhausted


I could not find a suitable Compiler switch or a parameter, that
can be set for the operating system (linux). "ulimit -v" is already
set to unlimited.

"gnatmem" reports, that my water mark with 1024 MB is reached, but
the final water mark is, needless to say, higher.


Best regards,
   Dennis Hoppe