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Maximilian Roos
a7c4a7a120
## What Move every `wt-perf` on-disk fixture out of the per-user cache dir and under the cargo target dir at `<target>/wt-perf/`, resolved by a renamed `wt_perf_fixture_dir()`: - `setup <config>` fixtures → `<target>/wt-perf/<config>` (was `~/.cache/wt-perf/<config>`). - The rust-lang/rust clone and `prune-real` fixtures → `<target>/wt-perf/bench-repos/` (was `~/.cache/wt-perf/bench-repos/`). - `wt_perf_cache_dir()` → `wt_perf_fixture_dir()`. The target dir is derived from the **running executable's own path** (it lives inside whichever dir cargo built into — `<target>/debug/wt-perf`, `<target>/release/deps/<bench>`), so it honors `CARGO_TARGET_DIR`, a config-file `build.target-dir`, and cargo-llvm-cov's `target/llvm-cov-target/` — none of which a bare `CARGO_TARGET_DIR` env read covers. Falls back to `<workspace>/target` if the binary isn't under a recognizable profile dir. The `etcetera` dependency is dropped. - The `WT_PERF_CACHE_DIR` env override (and the empty-value guard it required) is removed; the benchmarks workflow now caches the deterministic `target/wt-perf/bench-repos` path directly. - In-process throwaway fixtures (`create_repo`) are unchanged — they keep using `tempfile::TempDir`. This reverses the location decision from #3542, which had moved these into `~/.cache/wt-perf`. ## Why `target/` is the conventional home for build/test-generated artifacts — gitignored, reaped by `cargo clean`, and already where criterion writes (`target/criterion`). Keeping every wt-perf fixture there gives one predictable location under the repo that `cargo clean` fully resets. Deriving the target dir from the running binary (rather than assuming `<workspace>/target`) keeps that property intact even when the target dir is relocated. ## Tradeoff (accepted) `target/` is **not** shared across git worktrees (worktrees don't share it) and is wiped by `cargo clean`. So the ~15 GiB `prune-real` rust clone re-clones per worktree and after every `cargo clean` — the cost #3542 avoided by using the cache dir. This is deliberate and documented on `wt_perf_fixture_dir`; it's cheap for the synthetic `setup` fixtures, which rebuild in seconds. ## Testing - `cargo build -p wt-perf --all-targets`, `cargo test -p wt-perf` — clean. - New unit test `target_dir_from_exe_finds_cargo_target` covers the resolution logic (relocated `CARGO_TARGET_DIR`, bench binary under `release/deps/`, cargo-llvm-cov's nested target, closest-profile-wins, and the outside-any-target fallback). - `pre-commit run --all-files` (fmt, clippy, yaml, typos, cargo-lock, custom hooks) — clean. - Smoke-tested end-to-end: `setup branches-2` lands at `<worktree>/target/wt-perf/branches-2` and writes nothing to `~/.cache/`; a copy of the binary run from a fake `<dir>/debug/wt-perf` correctly resolves fixtures to `<dir>/wt-perf/`, proving a relocated target dir is honored. > _This was written by Claude Code on behalf of Maximilian_ --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>