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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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| .. | ||
| External | ||
| Modules | ||
| Modules_CUDA_fix | ||
| public | ||
| Allowlist.cmake | ||
| BLAS_ABI.cmake | ||
| BuildVariables.cmake | ||
| Caffe2Config.cmake.in | ||
| cmake_uninstall.cmake.in | ||
| Codegen.cmake | ||
| DebugHelper.cmake | ||
| Dependencies.cmake | ||
| FlatBuffers.cmake | ||
| IncludeSource.cpp.in | ||
| iOS.cmake | ||
| Metal.cmake | ||
| MiscCheck.cmake | ||
| prioritized_text.txt | ||
| ProtoBuf.cmake | ||
| ProtoBufPatch.cmake | ||
| Summary.cmake | ||
| TorchConfig.cmake.in | ||
| TorchConfigVersion.cmake.in | ||
| VulkanCodegen.cmake | ||
| VulkanDependencies.cmake | ||