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# Motivation
In https://github.com/pytorch/pytorch/pull/145591, `std::hardware_destructive_interference_size` was introduced in CUDACachingAllocator. Later, https://github.com/pytorch/pytorch/pull/160067 moved it to `c10/core/alignment.h` for code reuse.
However, on **GCC 13+** using `std::hardware_destructive_interference_size` triggers the following warning:
```bash
warning: use of ‘std::hardware_destructive_interference_size’ [-Winterference-size]
/home/pt-gpu/4T-4652/guangyey/stock-pytorch/aten/src/ATen/core/CachingHostAllocator.h:42:16: note: its value can vary between compiler versions or with different ‘-mtune’ or ‘-mcpu’ flags
/home/pt-gpu/4T-4652/guangyey/stock-pytorch/aten/src/ATen/core/CachingHostAllocator.h:42:16: note: if this use is part of a public ABI, change it to instead use a constant variable you define
/home/pt-gpu/4T-4652/guangyey/stock-pytorch/aten/src/ATen/core/CachingHostAllocator.h:42:16: note: the default value for the current CPU tuning is 64 bytes
/home/pt-gpu/4T-4652/guangyey/stock-pytorch/aten/src/ATen/core/CachingHostAllocator.h:42:16: note: you can stabilize this value with ‘--param hardware_destructive_interference_size=64’, or disable this warning with ‘-Wno-interference-size’
```
# Solution
- Solution 1: Replace `c10::hardware_destructive_interference_size` with a constant 64.
```cpp
constexpr std::size_t hardware_destructive_interference_size = 64;
```
- Solution 2: adding `-Wno-interference-size’ to
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| .. | ||
| boxing | ||
| dispatch | ||
| op_registration | ||
| adaption.cpp | ||
| alias_info.h | ||
| Array.h | ||
| ATen_fwd.h | ||
| ATen_pch.h | ||
| ATenGeneral.cpp | ||
| ATenGeneral.h | ||
| ATenOpList.h | ||
| BackendSelectFallbackKernel.cpp | ||
| Backtrace.h | ||
| blob.cpp | ||
| blob.h | ||
| builtin_function.h | ||
| CachingHostAllocator.cpp | ||
| CachingHostAllocator.h | ||
| CheckMemoryFormat.h | ||
| class_type.cpp | ||
| class_type.h | ||
| custom_class.cpp | ||
| custom_class.h | ||
| DeprecatedTypeProperties.cpp | ||
| DeprecatedTypeProperties.h | ||
| DeprecatedTypePropertiesRegistry.cpp | ||
| DeprecatedTypePropertiesRegistry.h | ||
| Dict_inl.h | ||
| Dict.cpp | ||
| Dict.h | ||
| Dimname.cpp | ||
| Dimname.h | ||
| DimVector.h | ||
| DistributionsHelper.h | ||
| dynamic_type.cpp | ||
| dynamic_type.h | ||
| enum_type.h | ||
| Formatting.cpp | ||
| Formatting.h | ||
| function_schema_inl.h | ||
| function_schema.cpp | ||
| function_schema.h | ||
| function.h | ||
| functional.h | ||
| Generator.cpp | ||
| Generator.h | ||
| GeneratorForPrivateuseone.cpp | ||
| GeneratorForPrivateuseone.h | ||
| grad_mode.h | ||
| IListRef_inl.h | ||
| IListRef_test.cpp | ||
| IListRef.h | ||
| interned_strings_class.h | ||
| interned_strings.cpp | ||
| interned_strings.h | ||
| ivalue_inl.h | ||
| ivalue_to.h | ||
| ivalue.cpp | ||
| ivalue.h | ||
| jit_type_base.h | ||
| jit_type.h | ||
| LegacyTypeDispatch.h | ||
| library.cpp | ||
| List_inl.h | ||
| List_test.cpp | ||
| List.cpp | ||
| List.h | ||
| MetaFallbackKernel.cpp | ||
| MT19937RNGEngine.h | ||
| NamedRegistrations.cpp | ||
| NamedTensor.cpp | ||
| NamedTensor.h | ||
| NestedIntSymNodeImpl.cpp | ||
| NestedIntSymNodeImpl.h | ||
| operator_name.cpp | ||
| operator_name.h | ||
| PhiloxRNGEngine.h | ||
| PythonFallbackKernel.cpp | ||
| PythonFallbackKernel.h | ||
| PythonOpRegistrationTrampoline.cpp | ||
| PythonOpRegistrationTrampoline.h | ||
| qualified_name.h | ||
| QuantizerBase.h | ||
| Range.cpp | ||
| Range.h | ||
| README.md | ||
| Reduction.h | ||
| register_symbols.cpp | ||
| rref_interface.h | ||
| Scalar.h | ||
| ScalarType.h | ||
| stack.h | ||
| symbol.h | ||
| tensor_type.cpp | ||
| Tensor.cpp | ||
| Tensor.h | ||
| TensorAccessor.h | ||
| TensorBase.h | ||
| TorchDispatchUtils.cpp | ||
| TorchDispatchUtils.h | ||
| TransformationHelper.h | ||
| type_factory.cpp | ||
| type_factory.h | ||
| type_ptr.h | ||
| type.cpp | ||
| typeid.h | ||
| UndefinedTensorImpl.h | ||
| union_type.cpp | ||
| UnsafeFromTH.h | ||
| VariableFallbackKernel.cpp | ||
| VariableHooksInterface.cpp | ||
| VariableHooksInterface.h | ||
| Variadic.h | ||
| Vitals.cpp | ||
| Vitals.h | ||
ATen Core
ATen Core is a minimal subset of ATen which is suitable for deployment on mobile. Binary size of files in this folder is an important constraint.