Re: Is there a maximum contiguous memory allocation?

"Giovanni Dicanio" <>
Sat, 19 Dec 2009 20:07:29 +0100
"Peter Olcott" <> ha scritto nel messaggio

I have read the Microsoft has placed and artificial 2GB limit on the size
of an array. I also read that this same limit applies to 64 bit .NET
applications, maximum object size of 2GB.

Considering your request of allocating a huge std::vector, I wrote this
simple console-mode program in VS2008 SP1, that you can build in x64:


#include <Windows.h>
#include <stdlib.h>

#include <vector>
#include <iostream>
#include <exception>

using namespace std;

int main(int argc, char * argv[])
        if ( argc != 2 )
            cout << "Syntax: " << argv[0] << " <gigabytes>" << endl;
            return EXIT_FAILURE;

        int gigabyteCount = atoi(argv[1]);

        cout << "Try allocating " << gigabyteCount << "GB in a vector..." <<
        static const size_t gigabyte = 1024 * 1024 * 1024;
        vector< BYTE > big( gigabyteCount * gigabyte );

        cout << "Vector allocated." << endl;
    catch (exception & e)
        cout << "*** ERROR: " << e.what() << endl;

    return 0;


I tested it on Windows 7 x64, and the allocation of a 4 GB std::vector
seemed to succeed; so I would think that the limit of 2GB does not apply to
native code.



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