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A workflow runs compare.py with pinned downloads on GitHub-hosted Ubuntu runners and shows the results as the job summary and as an artifact: started by hand (workflow_dispatch: x86-64 or AArch64, GCC or Clang), or when a pull request gets the label "benchmark" (both architectures, GCC). The label trigger gives numbers before the workflow is on the default branch, which workflow_dispatch needs. Shared runners are noisy, so the numbers show where json_view stands on another architecture; published numbers still need a quiet machine. compare.py takes the CPU name from lscpu where /proc/cpuinfo has none (AArch64 Linux), and falls back to the architecture. Checked in Linux containers (AArch64, Clang 15 and GCC 9, offline with the pinned archives). Signed-off-by: Niels Lohmann <mail@nlohmann.me>