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POTimeout in CUDA? / fermi / gtx465
 

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  1. POTimeout in CUDA? / fermi / gtx465
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    <p>I am using CUDA SDK 3.1 on MS VS2005 with GPU GTX465 1 GB. I have such a kernel function:</p> <pre><code>__global__ void CRT_GPU_2(float *A, float *X, float *Y, float *Z, float *pIntensity, float *firstTime, float *pointsNumber) { int holo_x = blockIdx.x*20 + threadIdx.x; int holo_y = blockIdx.y*20 + threadIdx.y; float k=2.0f*3.14f/0.000000054f; if (firstTime[0]==1.0f) { pIntensity[holo_x+holo_y*MAX_FINAL_X]=0.0f; } for (int i=0; i&lt;pointsNumber[0]; i++) { pIntensity[holo_x+holo_y*MAX_FINAL_X]=pIntensity[holo_x+holo_y*MAX_FINAL_X]+A[i]*cosf(k*sqrtf(pow(holo_x-X[i],2.0f)+pow(holo_y-Y[i],2.0f)+pow(Z[i],2.0f))); } __syncthreads(); } </code></pre> <p>and this is function which calls kernel function:</p> <pre><code>extern "C" void go2(float *pDATA, float *X, float *Y, float *Z, float *pIntensity, float *firstTime, float *pointsNumber) { dim3 blockGridRows(MAX_FINAL_X/20,MAX_FINAL_Y/20); dim3 threadBlockRows(20, 20); CRT_GPU_2&lt;&lt;&lt;blockGridRows, threadBlockRows&gt;&gt;&gt;(pDATA, X, Y, Z, pIntensity,firstTime, pointsNumber); CUT_CHECK_ERROR("multiplyNumbersGPU() execution failed\n"); CUDA_SAFE_CALL( cudaThreadSynchronize() ); } </code></pre> <p>I am loading in loop all the paramteres to this function (for example 4096 elements for each parameter in one loop iteration). In total I want to make this kernel for 32768 elements for each parameter after all loop iterations. </p> <p>The MAX_FINAL_X is 1920 and MAX_FINAL_Y is 1080.</p> <p>When I am starting alghoritm first iteration goes very fast and after one or two iteration more I get information about CUDA timeout error. I used this alghoritm on GPU gtx260 and it was doing better as far as I remember...</p> <p>Could You help me.. maybe I am doing some mistake according to new Fermi arch in this algorithm? </p>
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