ManagedCuda exception

[Marcoozvn]

Hello, could you help me with this exception?

ManagedCuda.CudaException: 'ErrorInvalidHandle: This indicates that a resource handle passed to the API call was not valid. Resource handles are opaque types like CUstream and CUevent.'

It was raised here:
public float RunSafe(NPPImage_32fC1 imgIn, NPPImage_32fC3 imgOut, float3 blackPoint, float3 scale)

I'm running using a NVIDIA RTX A3000 GPU with 6GB of memory.

[kunzmi]

Hi,

this sounds again like the context creation error we had already in some other issue, I just don't find it right now. The problem is that newer Cuda versions than the one I use in this old project create a PrimaryContext for the Cuda libraries like NPP and CUFFT.
So the trick is to also use a PrimaryContext and not a standard context with ImageStackAligntor.
Try to modify line 203 of ImagePresenterDX.xaml.cs from

_ctx = new CudaContext(cudaDevices[0], _device.ComPointer, CUCtxFlags.BlockingSync, CudaContext.DirectXVersion.D3D9);

to

_ctx = new PrimaryContext(0); //choose what ever deviceID you need, this old managedCuda version does not allow to create primary context from CUdevice
_ctx.SetCurrent();

Doing so, NPP will run on the same context as the normal Cuda code and the error message should disappear.

Cheers,
Michael