OutOfMemoryException on declaration of Large Array

Question

I have to create a fairly large double array 12000ish x 55000ish. Unfortunately, I get an out of memory exception. I used to develop in Java and could change the memory sett

Answer 1

Since you can't create objects larger than 2GB you can try to use MemoryMappedFile to work with chunk of memory of the required size.

var data = MemoryMappedFile.CreateNew("big data", 12000L * 55000L);
var view = data.CreateViewAccessor();
var rnd = new Random();

for (var i = 0L; i < 12000L; ++i)
{
    for (var j = 0L; j < 55000L; ++j)
    {
        var input = rnd.NextDouble();
        view.Write(i * 55000L + j, ref input);
    }
}