[all-commits] [llvm/llvm-project] 6dcf59: [GitHub] Avoid downloading outputs during Bazel te...

[Jackson Stogel via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6dcf5908ccec4be39b52b61630b0f494a04a01b7
      https://github.com/llvm/llvm-project/commit/6dcf5908ccec4be39b52b61630b0f494a04a01b7
  Author: Jackson Stogel <jtstogel at gmail.com>
  Date:   2026-09-22 (Tue, 22 Sep 2026)

  Changed paths:
    M .github/workflows/bazel-checks.yml

  Log Message:
  -----------
  [GitHub] Avoid downloading outputs during Bazel tests when possible (#224725)

PR adds
[`--remote_download_outputs=minimal`](https://bazel.build/reference/command-line-reference#param-remote-download-outputs-1)
to bazel tests in CI. I noticed recently that `Bazel Build/Test` takes
~2m to run even when everything is cached. It looks like it's
downloading ~1GiB of artifacts from the remote cache. For example, in [a
recent
run](https://github.com/llvm/llvm-project/actions/runs/35147456695/job/104967035656):

```
[82,641 / 90,341] 1094 / 7245 tests; Linking external/+_repo_rules+llvm-project/flang/lib/Semantics/libFortranSemantics.a; Downloading external/+_repo_rules+llvm-project/flang/lib/Semantics/libFortranSemantics.a, 260.4 MiB / 288.7 MiB; 1s remote-cache ... (62 actions, 10 running)
[88,426 / 91,191] 1238 / 7245 tests; Linking external/+_repo_rules+llvm-project/mlir/mlir-reduce; Downloading external/+_repo_rules+llvm-project/mlir/mlir-reduce, 337.0 MiB / 344.6 MiB; 13s remote-cache ... (58 actions, 0 running)
[88,870 / 92,185] 1315 / 7245 tests; Linking external/+_repo_rules+llvm-project/mlir/mlir-query; Downloading external/+_repo_rules+llvm-project/mlir/mlir-query, 241.9 MiB / 264.2 MiB; 11s remote-cache ... (55 actions, 0 running)
...
Executed 0 out of 7245 tests: 7245 tests pass.
```

Using this flag saves ~20-30s on my machine. After this PR, the majority
of the remaining time is spent just asking the remote cache "do you have
this output cached?" Could save another ~40s by bumping
[`--remote_max_connections`](https://bazel.build/reference/command-line-reference#param-remote-max-connections),
but I don't think the fully-cached case matters that much.



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