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Avoid the race condition on cuda sums.

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This commit is contained in:
laurent
2023-06-26 16:19:06 +01:00
parent 687c5beb6a
commit f2ac5547fc
3 changed files with 15 additions and 3 deletions
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5
examples/cuda_basics.rs
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@ -3,6 +3,11 @@ use candle::{Device, Tensor};
fn main() -> Result<()> {
let device = Device::new_cuda(0)?;
let x = Tensor::new(&[[11f32, 22.], [33., 44.], [55., 66.], [77., 78.]], &device)?;
println!("> {:?}", x.sum(&[0])?.to_vec2::<f32>()?);
println!("> {:?}", x.sum(&[1])?.to_vec2::<f32>()?);
println!("> {:?}", x.sum(&[0, 1])?.to_vec2::<f32>()?);
let x = Tensor::new(&[3f32, 1., 4., 1., 5.], &device)?;
println!("{:?}", x.to_vec1::<f32>()?);
let y = Tensor::new(&[2f32, 7., 1., 8., 2.], &device)?;

4
kernels/src/reduce.cu
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@ -20,7 +20,7 @@ extern "C" __global__ void FN_NAME( \
for (unsigned int nd = 0; nd < num_sum_dims; ++nd) { \
size_t stride = sum_dims_s[nd]; \
size_t pre = dst_index / stride; \
size_t post = dst_index / stride; \
size_t post = dst_index % stride; \
dst_index = (pre / sum_dims_l[nd]) * stride + post; \
} \
out[dst_index] += inp[i]; \
@ -33,7 +33,7 @@ extern "C" __global__ void FN_NAME( \
for (unsigned int nd = 0; nd < num_sum_dims; ++nd) { \
size_t stride = sum_dims_s[nd]; \
size_t pre = dst_index / stride; \
size_t post = dst_index / stride; \
size_t post = dst_index % stride; \
dst_index = (pre / sum_dims_l[nd]) * stride + post; \
} \
out[dst_index] += inp[strided_i]; \

9
src/cuda_backend.rs
View File

@ -314,7 +314,14 @@ impl CudaStorage {
.iter()
.map(|&d| src_dims[d + 1..].iter().product::<usize>())
.collect();
let cfg = LaunchConfig::for_num_elems(el as u32);
// let cfg = LaunchConfig::for_num_elems(el as u32);
// TODO: Hack to run the computation on a single thread, replace with a proper distributed
// algorithm.
let cfg = LaunchConfig {
grid_dim: (1, 1, 1),
block_dim: (1, 1, 1),
shared_mem_bytes: 0,
};
let dev = self.device();
let ds = dev.htod_copy([src_dims, stride, &sum_dims_l, &sum_dims_s].concat())?;
let slice = match &self.slice {