提交 3b38e5a4 编写于 作者: S sneaxiy

speed up stack_op

上级 ba168bd2
......@@ -150,30 +150,17 @@ class StackKernel : public framework::OpKernel<T> {
int total_num = pre * n * post;
auto &dev_ctx = ctx.template device_context<DeviceContext>();
constexpr auto kMaxThreshold = 16;
if (std::is_same<DeviceContext, platform::CPUDeviceContext>::value ||
n > kMaxThreshold) {
#ifdef __NVCC__
VLOG(10) << "Stack more than " << kMaxThreshold
<< " tensors on GPU may be slow.";
thrust::device_vector<const T *> device_x_vec(x_datas);
auto x_data_arr = device_x_vec.data().get();
thrust::device_vector<const T *> device_x_vec(x_datas);
auto x_data_arr = device_x_vec.data().get();
#else
auto x_data_arr = x_datas.data();
auto x_data_arr = x_datas.data();
#endif
StackFunctorForRange(dev_ctx, x_data_arr, y_data, total_num, n, post);
StackFunctorForRange(dev_ctx, x_data_arr, y_data, total_num, n, post);
#ifdef __NVCC__
// Wait() must be called because device_x_vec may be destructed before
// kernel ends
dev_ctx.Wait();
#endif
}
#ifdef __NVCC__
else { // NOLINT
framework::Array<const T *, kMaxThreshold> x_data_arr;
for (int i = 0; i < n; ++i) x_data_arr[i] = x_datas[i];
StackFunctorForRange(dev_ctx, x_data_arr, y_data, total_num, n, post);
}
// Wait() must be called because device_x_vec may be destructed before
// kernel ends
dev_ctx.Wait();
#endif
}
};
......@@ -244,32 +231,17 @@ class StackGradKernel : public framework::OpKernel<T> {
int post = total_num / (n * pre);
auto &dev_ctx = ctx.template device_context<DeviceContext>();
constexpr auto kMaxThreshold = 16;
if (std::is_same<DeviceContext, platform::CPUDeviceContext>::value ||
n > kMaxThreshold) {
#ifdef __NVCC__
VLOG(10) << "Stack more than " << kMaxThreshold
<< " tensors on GPU may be slow.";
thrust::device_vector<T *> device_dx_vec(dx_datas);
auto dx_data_arr = device_dx_vec.data().get();
thrust::device_vector<T *> device_dx_vec(dx_datas);
auto dx_data_arr = device_dx_vec.data().get();
#else
auto dx_data_arr = dx_datas.data();
auto dx_data_arr = dx_datas.data();
#endif
StackGradFunctorForRange(dev_ctx, dx_data_arr, dy_data, total_num, n,
post);
StackGradFunctorForRange(dev_ctx, dx_data_arr, dy_data, total_num, n, post);
#ifdef __NVCC__
// Wait() must be called because device_dx_vec may be destructed before
// kernel ends
dev_ctx.Wait();
#endif
}
#ifdef __NVCC__
else { // NOLINT
framework::Array<T *, kMaxThreshold> dx_data_arr;
for (int i = 0; i < n; ++i) dx_data_arr[i] = dx_datas[i];
StackGradFunctorForRange(dev_ctx, dx_data_arr, dy_data, total_num, n,
post);
}
// Wait() must be called because device_dx_vec may be destructed before
// kernel ends
dev_ctx.Wait();
#endif
}
};
......
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