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POCUDA - Copy device data to host?
 

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    <p>I have device variable and in this variable I alloc and fill array in device, but I have problem to get data to host. cudaMemcpy() return cudaErrorInvalidValue error. how can i do it?</p> <p>PS: The Code is just example, I know, that In this particular case I can use cudaMalloc, because I know size of array, but In my REAL code, It computes size of array in device and it needs immediately alloc memory. </p> <p>PS2: I found similar problem, but I still dont know, how can i solve it? - <a href="https://stackoverflow.com/questions/8322547/copy-data-which-is-allocated-in-device-from-device-to-host">copy data which is allocated in device from device to host</a></p> <p>PS3: I have updated code, but still doesnt works :{</p> <p>PS4: I am just trying to run this code on notebook with Nvidia GT 520MX(lastest game driver) and doesnt work too :(</p> <p>thx</p> <pre><code>#include &lt;cuda.h&gt; #include &lt;stdio.h&gt; #define N 400 __device__ int* d_array; __global__ void allocDeviceMemory() { d_array = new int[N]; for(int i=0; i &lt; N; i++) d_array[i] = 123; } int main() { allocDeviceMemory&lt;&lt;&lt;1, 1&gt;&gt;&gt;(); cudaDeviceSynchronize(); int* d_a = NULL; cudaMemcpyFromSymbol((void**)&amp;d_a, "d_array", sizeof(d_a), 0, cudaMemcpyDeviceToHost); printf("gpu adress: %lld\n", d_a); int* h_array = (int*)malloc(N*sizeof(int)); cudaError_t errr = cudaMemcpy(h_array, d_a, N*sizeof(int), cudaMemcpyDeviceToHost); printf("h_array: %d, %d\n", h_array[0], errr); getchar(); return 0; } </code></pre>
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