Re: Is there a maximum contiguous memory allocation?
"Peter Olcott" <NoSpam@SeeScreen.com> 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:
using namespace std;
int main(int argc, char * argv)
if ( argc != 2 )
cout << "Syntax: " << argv << " <gigabytes>" << endl;
int gigabyteCount = atoi(argv);
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;
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
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