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try to use parallelism

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This commit is contained in:
Hieu Hoang 2016-09-16 17:05:51 +02:00
parent 269b94cea6
commit 4ea1156e99
1 changed files with 18 additions and 1 deletions
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19
src/test.cu
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@ -25,6 +25,22 @@ __global__ void gArgMax(float* arr, size_t rows, size_t cols) {
}
}
__global__ void gArgMax2(float* arr, size_t rows, size_t cols) {
size_t row = blockIdx.x;
size_t startInd = row * cols;
float maxScore = -99999;
size_t maxInd = -1;
for (size_t col = 0; col < cols; ++col) {
size_t ind = startInd + col;
float score = arr[ind];
if (score > maxScore) {
maxScore = score;
maxInd = col;
}
}
arr[startInd] = maxInd;
}
string output(const std::vector<float> &vec)
{
stringstream strm;
@ -46,7 +62,8 @@ void temp()
thrust::copy(hVec.begin(), hVec.end(), dVec.begin());
float *data = thrust::raw_pointer_cast(dVec.data());
gArgMax<<<10, 20, sizeof(float)>>>(data, 4, 2);
//gArgMax<<<10, 20, sizeof(float)>>>(data, 4, 2);
gArgMax2<<<10, 20, sizeof(float)>>>(data, 4, 2);
std::vector<float> hVec2(8);
thrust::copy(dVec.begin(), dVec.end(), hVec2.begin());