[libc++] Add documentation for the new comment-triggered benchmarking bot #158167
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llvmbot
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@llvm/pr-subscribers-libcxx Author: Louis Dionne (ldionne) ChangesThe new benchmarking bot is experimental and is very rough on the edges. Full diff: https://github.com/llvm/llvm-project/pull/158167.diff 1 Files Affected:
diff --git a/libcxx/docs/TestingLibcxx.rst b/libcxx/docs/TestingLibcxx.rst
index 44463385b81a7..227791031bab0 100644
--- a/libcxx/docs/TestingLibcxx.rst
+++ b/libcxx/docs/TestingLibcxx.rst
@@ -531,6 +531,16 @@ Finally, use ``compare-benchmarks`` to compare both:
The ``compare-benchmarks`` script provides some useful options like creating a chart to easily visualize
differences in a browser window. Use ``compare-benchmarks --help`` for details.
+Additionally, adding a comment of the following form to a libc++ PR will cause the specified benchmarks to be run
+on our pre-commit CI infrastructure and the results to be reported in the PR by our CI system:
+
+.. code-block::
+
+ /libcxx-bot benchmark <path/to/benchmark1.bench.cpp> <path/to/benchmark2.bench.cpp> ...
+
+Note that this is currently experimental and the results should not be relied upon too strongly, since
+we do not have dedicated hardware to run the benchmarks on.
+
.. _`Google Benchmark`: https://github.com/google/benchmark
.. _testing-hardening-assertions:
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/libcxx-bot benchmark libcxx/test/benchmarks/containers/sequence/vector.bench.cpp Benchmark results: |
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Let's hope it works like it did during my testing :) CI job running the benchmarks: https://github.com/llvm/llvm-project/actions/runs/17660356184/job/50192377946 |
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Another try (https://github.com/llvm/llvm-project/actions/runs/17660748509) /libcxx-bot benchmark libcxx/test/benchmarks/join_view.bench.cpp libcxx/test/benchmarks/hash.bench.cpp Benchmark results:Benchmark results: |
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/libcxx-bot benchmark libcxx/test/benchmarks |
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Sep 21, 2025
… bot (llvm#158167) The new benchmarking bot is experimental and is very rough on the edges.
SeongjaeP
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Sep 23, 2025
… bot (llvm#158167) The new benchmarking bot is experimental and is very rough on the edges.
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The new benchmarking bot is experimental and is very rough on the edges.