How much memory should you be able to allocate?

Question

Background: I am writing a C++ program working with large amounts of geodata, and wish to load large chunks to process at a single go. I am constrained to working with an a

Answer 1

You should be able to allocate a total of about 2GB per process. This article (PDF) explains the details. However, you probably won't be able to get a single, contiguous block that is even close to that large.