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Fix missing trailing barrier in ivf_rabitq blockReduceSum #2322

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Fix missing trailing barrier in ivf_rabitq blockReduceSum #2322

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4 changes: 4 additions & 0 deletions cpp/src/neighbors/ivf_rabitq/utils/reductions.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,10 @@ __inline__ __device__ T blockReduceSum(T val)
int wid = threadIdx.x >> 5;

val = warpReduceSum(val);
// Wait until every warp has finished reading shared[] in the previous call
// before this call overwrites it. Doing this after the warp-local reduction
// overlaps the extra synchronization with useful work.
__syncthreads();
if (lane == 0) shared[wid] = val;
__syncthreads();

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