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Fix sccache summary to count CUDA sub-tool cache hits #2046

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Fix sccache summary to count CUDA sub-tool cache hits #2046

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11 changes: 5 additions & 6 deletions .github/actions/sccache-summary/action.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -6,8 +6,6 @@ name: sccache summary
description: Parse sccache stats JSON and write a summary table to GITHUB_STEP_SUMMARY

# Inspired by NVIDIA/cccl's prepare-execution-summary.py (PR #3621).
# Only counts C/C++ and CUDA language hits (excludes PTX/CUBIN which are
# not included in sccache's compile_requests counter).

inputs:
json-file:
Expand Down Expand Up @@ -47,10 +45,11 @@ runs:
with open(json_file) as f:
stats = json.load(f)["stats"]

# compile_requests includes non-compilation calls (linker, etc).
# Use cache_hits + cache_misses as the denominator to match sccache's
# own "Cache hits rate" which only counts actual compilation requests.
counted_languages = {"C/C++", "CUDA"}
# compile_requests only counts top-level nvcc invocations, but each
# invocation spawns sub-tool compilations (cudafe++, cicc, ptxas) that
# sccache tracks under separate language keys. Count all of them so
# the reported rate matches sccache's own "Cache hits rate".
counted_languages = {"C/C++", "CUDA", "CUDA (Device code)", "PTX", "CUBIN"}
hits = sum(
v for k, v in stats.get("cache_hits", {}).get("counts", {}).items()
if k in counted_languages
Expand Down