why is my c program suddenly using 30g of virtual memory?

Question

In top, I noticed that my c program (using CUDA 3.2) has a virtual size of 28g or more (looking at VIRT), on every run right from the beginning. This doesn\'t make ANY sense to

Answer 1

UVA requires CUDA to allocate enough virtual memory to map all of both GPU and system memory. Please see post #5 in the following thread on the NVIDIA forums: