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[AUTOGENERATED] [release/2.5] Change gfx110x BLAS preferred backend #2169

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Merged
merged 2 commits into from
Jun 6, 2025
Merged

[AUTOGENERATED] [release/2.5] Change gfx110x BLAS preferred backend #2169

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060691e
[release/2.6] Change gfx110x BLAS preferred backend (#2053)
amd-imilenko May 13, 2025
6b3eece
defaulting to hipBLASLt for gfx90a and gfx942 only
apakbin May 21, 2025
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31 changes: 28 additions & 3 deletions aten/src/ATen/Context.h
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Original file line number Diff line number Diff line change
Expand Up @@ -425,12 +425,37 @@ class TORCH_API Context {
c10::utils::check_env("TORCH_LINALG_PREFER_CUSOLVER") == true
? at::LinalgBackend::Cusolver
: at::LinalgBackend::Default;
at::BlasBackend blas_preferred_backend =
#ifdef USE_ROCM
(c10::utils::check_env("TORCH_BLAS_PREFER_HIPBLASLT") != false)
// AMD Instinct targets prefer hipblaslt
const bool _hipblaslt_preferred_default = []() {
const std::vector<std::string> archs = {
"gfx90a", "gfx942"
};
for (auto index: c10::irange(detail::getCUDAHooks().deviceCount())) {
if (!detail::getCUDAHooks().isGPUArch(index, archs)) {
return false;
}
}
return true;
}();
#else
(c10::utils::check_env("TORCH_BLAS_PREFER_CUBLASLT") == true)
const bool _hipblaslt_preferred_default = false;
#endif
const bool _blaslt_preferred = [&]() {
auto env = c10::utils::check_env("TORCH_BLAS_PREFER_CUBLASLT");
if (env.has_value()) {
return env.value();
}
env = c10::utils::check_env("TORCH_BLAS_PREFER_HIPBLASLT");
if (env.has_value()) {
return env.value();
}
#ifdef USE_ROCM
return _hipblaslt_preferred_default;
#endif
return false;
}();
at::BlasBackend blas_preferred_backend = _blaslt_preferred
? at::BlasBackend::Cublaslt
: at::BlasBackend::Cublas;
at::ROCmFABackend rocm_fa_preferred_backend =
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