Hi guys!
I’m getting the error in the Title when I try to call cudaSetDevice(i);
after i called my CUDA DLL function From C#
As I read it, I probably have some cuda device memory still not freed, but thats not likely couse I use only 2 device arrays and i free them every time. Did I do something wrong? Does any other thing could cause my problem?
shorten cuda DLL function code:
int *a is my array with 0-255 number
int *eredmenytomb is my calculated array with numbers 0-12750
[codebox]stuktura_tipus* DLLfun2(int *a, int *eredmenytomb, int dimX, int dimY, int filter, int offset)
{
char *error;
stuktura_tipus *my_stuktura;
my_stuktura = (stuktura_tipus*) malloc(sizeof(stuktura_tipus));
int dimA = dimX*dimY;
//my_stuktura->eredmenykeptomb = (int*) malloc(sizeof(int)*dimA);
// define grid and block size
int numThreadsPerBlock = 16;
int n_blocks = dimA/numThreadsPerBlock + (dimA%numThreadsPerBlock == 0?0:1); // 1024 blocks
// pointer for device memory
int *d_a, *d_b;
// allocate host and device memory
size_t memSize = dimA * sizeof(int);
cudaMalloc( (void **) &d_a, memSize );
cudaMalloc( (void **) &d_b, memSize );
// Copy host array to device array
cudaMemcpy( d_a, a, memSize, cudaMemcpyHostToDevice );
error = checkCUDAError(" memcpy_todevice ");
if (error != "noerr"){
my_stuktura->cuda_err = error;
// free device memory on error
cudaFree(d_a);
cudaFree(d_b);
return my_stuktura;
}
// launch kernel
reverseArrayBlock<<< n_blocks, numThreadsPerBlock >>>( d_b , d_a , dimA, dimX, dimY, offset);
// block until the device has completed
cudaThreadSynchronize();
// check if kernel execution generated an error
error = checkCUDAError(" kernel invocation ");
if (error != "noerr"){
my_stuktura->cuda_err = error;
// free device memory on error
cudaFree(d_a);
cudaFree(d_b);
return my_stuktura;
}
// device to host copy
cudaMemcpy( eredmenytomb, d_b, memSize, cudaMemcpyDeviceToHost );
// Check for any CUDA errors
error = checkCUDAError(" memcpy_backtoHost ");
if (error != "noerr"){
my_stuktura->cuda_err = error;
// free device memory on error
cudaFree(d_a);
cudaFree(d_b);
return my_stuktura;
}
// free device memory
cudaFree(d_a);
cudaFree(d_b);
my_stuktura->cuda_err = error;
return my_stuktura;
};[/codebox]
