CUDA device to host copy very slow

Question

I\'m running windows 7 64 bits, cuda 4.2, visual studio 2010.

First, I run some code on cuda, then download the data back to host. Then do some processing and move b

Answer 1

I suggest you to use cudpp, in my opinion is faster than thrust (I'm writing master thesis about optimization and I tried both libraries). If copy is very slow, you can try to write your own kernel to copy data.