c# - How to do CudaMemcpy using CUdeviceptr -

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i'm trying wrapper in С++ dll cuda, able use in c# (yeah, know there's managedcuda , cudafy, still try this)

the thing is, able pass pointer reference c#, cant usual , cuda malloc float*. trying manage cudeviceptr, but, though cudamalloc apparently works (no error given cudagetlasterror), when cudamemcpy using cudevicptr variable breaks , gives "invalid argument" error.

extern "c" __declspec(dllexport) void __cdecl allocatedevicememory(float*, cudeviceptr,     unsigned int);  extern void allocatedevicememory(float* data, cudeviceptr device_pointer, unsigned int numelements){ cudamalloc((void**)&device_pointer,numelements * sizeof(float)); cudaerror_t error = cudagetlasterror(); printf("cudaerror.... 1  %s\n", cudageterrorstring(error));  cudamemcpy((void*)&device_pointer ,data,numelements * sizeof(float), cudamemcpyhosttodevice); error = cudagetlasterror(); printf("cudaerror.... 2  %s\n", cudageterrorstring(error)); }

does have ideas how can done?

change

cudamemcpy((void*)&device_pointer ,data,numelements * sizeof(float), cudamemcpyhosttodevice)

to

cudamemcpy((void *)device_pointer ,data,numelements * sizeof(float), cudamemcpyhosttodevice

cudeviceptr device pointer. when doing &device_pointer, sending in pointer device pointer. cudamalloc expects pointer pointer , works fine. cudamemcpy expects device pointer (not pointer pointer).

  • if want use driver api (i.e. use cudeviceptr), use cumemalloc , cumemcpyhtod

  • if want use runtime api use void * memory pointers , cast them required type. can use cudamalloc , cudamemcpy runtime api.

edit: added edit explicitly cast cudeviceptr void *. added information driver , device api.


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