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Fix potential race condition in the CUDA reduction code.

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This commit is contained in:
Benoit Steiner 2016-05-11 10:08:51 -07:00
parent cbb14ed47e
commit 08348b4e48
1 changed files with 4 additions and 0 deletions
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4
unsupported/Eigen/CXX11/src/Tensor/TensorReductionCuda.h
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@ -121,6 +121,7 @@ __global__ void FullReductionKernel(Reducer reducer, const Self input, Index num
// Initialize the output value if it wasn't initialized by the ReductionInitKernel // Initialize the output value if it wasn't initialized by the ReductionInitKernel
if (gridDim.x == 1 && first_index == 0) { if (gridDim.x == 1 && first_index == 0) {
*output = reducer.initialize(); *output = reducer.initialize();
__syncthreads();
} }
typename Self::CoeffReturnType accum = reducer.initialize(); typename Self::CoeffReturnType accum = reducer.initialize();
@ -172,6 +173,7 @@ static __global__ void FullReductionKernelHalfFloat(Reducer reducer, const Self
} else { } else {
*scratch = reducer.template initializePacket<half2>(); *scratch = reducer.template initializePacket<half2>();
} }
__syncthreads();
} }
half2 accum = reducer.template initializePacket<half2>(); half2 accum = reducer.template initializePacket<half2>();
@ -316,6 +318,7 @@ __global__ void InnerReductionKernel(Reducer reducer, const Self input, Index nu
for (Index i = thread_id; i < num_preserved_coeffs; i += num_threads) { for (Index i = thread_id; i < num_preserved_coeffs; i += num_threads) {
output[i] = reducer.initialize(); output[i] = reducer.initialize();
} }
_syncthreads();
} }
for (Index i = blockIdx.x; i < num_input_blocks; i += gridDim.x) { for (Index i = blockIdx.x; i < num_input_blocks; i += gridDim.x) {
@ -420,6 +423,7 @@ __global__ void OuterReductionKernel(Reducer reducer, const Self input, Index nu
for (Index i = thread_id; i < num_preserved_coeffs; i += num_threads) { for (Index i = thread_id; i < num_preserved_coeffs; i += num_threads) {
output[i] = reducer.initialize(); output[i] = reducer.initialize();
} }
__syncthreads();
} }
// Do the reduction. // Do the reduction.