nvcc compilation using -G

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi,

 What does the compiler nvcc do when a cuda code is compiled with the option -G ?
 I'm getting an exorbitant speedup when this flag is used. I understand that this should be turned on to be used with cuda-gdb.
 I have a lot of templated device functions, operator overloading etc...

Dominic

2

You should see the opposite - -G spills registers to local memory and generally makes things considerably slower. You might want to check that the kernels are actually launching at all.

3

You should see the opposite - -G spills registers to local memory and generally makes things considerably slower. You might want to check that the kernels are actually launching at all.

4

Yup… It never launched when my array size was huge. When the array size is small, it does take more time. Thanks for the info.

5

Yup… It never launched when my array size was huge. When the array size is small, it does take more time. Thanks for the info.