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Tango performance comparison harness - #523
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tinder-maxwellelliott merged 1 commit intoOct 15, 2026
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Add tools/perf/tango_compare.py, a stdlib-only harness that benchmarks bazel-diff against Uber's Tango on identical workloads. It builds Tango's example server and client from source at a pinned commit, generates synthetic genrule workspaces (small/medium/large/xlarge presets, custom sizes, or a real repository), and times both tools end to end on the same base..head pair: cold (fresh Bazel servers), warm (servers alive, Tango with -bypass-cache) and diff-only. Tool order alternates per iteration. The impacted label sets are cross-checked and a markdown summary plus a JSON metrics report are written. The pure helpers (Tango's id-mapped JSON stream, Go duration strings, label diffing, spec parsing, summary rendering) are covered by a py_test under //tools/perf. The harness itself is not a py_binary, like the serve harnesses, because it can shell out to `bazel build`. A new perf-tango-compare workflow runs the four presets nightly and on dispatch (workloads, iterations, Tango ref, pool size, quick profile inputs), publishing the summary as a step summary and a 90-day artifact. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FUbHuckDDMM9DEvfiZo6xo
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A new cron based harness we can use to compare performance between these tools