Determine paramter for cuFuncSetSharedSize

[ebfe]

I’m currently moving from the Runtime API to the Driver API. Before the kernel is launched with cuLaunchGrid, the shared-memory-size has to be set with cuFuncSetSharedSize. When compiling the desired function with nvcc, the ptx-stage tells me how many bytes of shared memory it allocates (due to register overflow). However this value differs for different platforms like SM_10 or SM_13 so I can’t hardcode it.

Is there a way to determine the size of shared memory a function requires when getting compiled with the jit compiler through cuLoadModule(Data) ?

[AndreiB]

When compiling the desired function with nvcc, the ptx-stage tells me how many bytes of shared memory it allocates (due to register overflow).

I’m pretty much sure nvcc uses local memory, not shared.

You don’t have to call cuFuncSetSharedSize() unless you need to allocate additional space in shared memory (this is what you do by passing c to kernel<<<a,b,c>>>() ).

So my guess is that you don’t actually need to cal this function at all.