PR #22073: Add a README file in the gpu_specs directory.

Imported from GitHub PR #22073 Copybara import of the project: -- 659afd5 by Dimitris Vardoulakis <[email protected]>: Add a README file in the gpu_specs directory. -- 9a8bf3a by Dimitris Vardoulakis <[email protected]>: Improved the README. Merging this change closes #22073 COPYBARA_INTEGRATE_REVIEW=#22073 from dimvar:add-readme-to-gpu_specs 9a8bf3a PiperOrigin-RevId: 721916973
openxla · Jan 31, 2025 · 811a86b · 811a86b
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+The specs in this folder are obtained by calling the appropriate override of
+`StreamExecutor::CreateDeviceDescription`, then turned into
+`GpuDeviceInfoProto`. (E.g., for NVIDIA GPUs, we call
+`CudaExecutor::CreateDeviceDescription`.) The specs are useful when compiling
+with the flag `--xla_gpu_target_config_filename`. Since a hardware generation
+may have several SKUs, a spec may not be identical to what we would get on a
+particular machine, but it will be "close enough".