getting number of cuda devices

Accelerated Computing CUDA CUDA Programming and Performance
1

Dear Friends,

which of the following methods can be used to get the number of cuda devices , cuDeviceGetcount() or CudaGetDeviceCount() ?
what is the difference between these two functions?
under which case each of them is used?

pls anone answere.

thanks,
Sunjutha

2

Both can be used, depending on whether you are using the runtime or device API. cuda* functions are in the runtime API and cu* functions are in the device API. See the programming guide for a description of the differences between the two API’s.

3

Has anyone noticed a problem with applications that use both APIs? (See other post.)