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| author | txh18 <cloudygooseg@gmail.com> | 2015-11-18 14:59:42 +0800 |
|---|---|---|
| committer | txh18 <cloudygooseg@gmail.com> | 2015-11-18 14:59:42 +0800 |
| commit | 22dac37c663605aa6c6fa0426696d2d01da4370f (patch) | |
| tree | ba4c3d66d69361e4f6343e5be8f69a09ae94a07a | |
| parent | 0acdf7bd21a1953d8e5ba07fb39a7187f049527f (diff) | |
small coding style change
| -rw-r--r-- | nerv/lib/matrix/generic/cukernel.cu | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/nerv/lib/matrix/generic/cukernel.cu b/nerv/lib/matrix/generic/cukernel.cu index f996fdd..e1063af 100644 --- a/nerv/lib/matrix/generic/cukernel.cu +++ b/nerv/lib/matrix/generic/cukernel.cu @@ -231,8 +231,9 @@ __global__ void cudak_(update_select_rows)(MATRIX_ELEM *c, const MATRIX_ELEM *a, int i = blockIdx.y * blockDim.y + threadIdx.y; if (i >= nrow_a || j >= ncol_a) return; int i_c = lrintf(idx[i]); - //c[j + i_c * stride_c] = c[j + i_c * stride_c] * (1 - beta * alpha) + a[j + i * stride_a] * alpha; - atomicAdd_nvidia(&c[j + i_c * stride_c], c[j + i_c * stride_c] * (- beta * alpha) + a[j + i * stride_a] * alpha); + //critical: i_c could conflict among threads(same index in the idx array), so atomicAdd is used + //c[j + i_c * stride_c] = c[j + i_c * stride_c] * (1 - beta * alpha) + a[j + i * stride_a] * alpha; + atomicAdd_nvidia(c + j + i_c * stride_c, c[j + i_c * stride_c] * (- beta * alpha) + a[j + i * stride_a] * alpha); } __global__ void cudak_(expand_frm)(const MATRIX_ELEM *a, MATRIX_ELEM *b, |