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Fix race condition in OpenCL kernel by frasercrmck · Pull Request #3535 · arrayfire/arrayfire · GitHub
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Fix race condition in OpenCL kernel #3535

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Merged
christophe-murphy merged 1 commit into from
Feb 20, 2025
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Fix race condition in OpenCL kernel #3535

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6 changes: 0 additions & 6 deletions src/backend/opencl/kernel/flood_fill.cl
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Original file line number Diff line number Diff line change
Expand Up @@ -42,13 +42,7 @@ int barrierOR(local int *predicates) {
barrier(CLK_LOCAL_MEM_FENCE);
}
int retVal = predicates[0];
#if AF_IS_PLATFORM_NVIDIA
// Without the extra barrier sync after reading the reduction result,
// the caller's loop is going into infinite loop occasionally which is
// in turn randoms hangs. This doesn't seem to be an issue on non-nvidia
// hardware. Hence, the check.
barrier(CLK_LOCAL_MEM_FENCE);
#endif
return retVal;
}

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2 changes: 0 additions & 2 deletions src/backend/opencl/kernel/flood_fill.hpp
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Expand Up @@ -84,8 +84,6 @@ void floodFill(Param out, const Param image, const Param seedsx,
DefineKeyValue(LMEM_WIDTH, (THREADS_X + 2 * RADIUS)),
DefineKeyValue(LMEM_HEIGHT, (THREADS_Y + 2 * RADIUS)),
DefineKeyValue(GROUP_SIZE, (THREADS_Y * THREADS_X)),
DefineKeyValue(AF_IS_PLATFORM_NVIDIA, (int)(AFCL_PLATFORM_NVIDIA ==
getActivePlatformVendor())),
getTypeBuildDefinition<T>()};

auto floodStep =
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