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perf(pm): add hyperfine --warmup 1 to phase-bench #2908

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fireairforce merged 1 commit into from
May 7, 2026
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perf(pm): add hyperfine --warmup 1 to phase-bench #2908

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9 changes: 9 additions & 0 deletions bench/pm-bench-phases.sh
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Expand Up @@ -347,8 +347,17 @@ run_phase() {

echo -e " ${CYAN}$pm${NC} · $phase"
export PROJECT_DIR UTOO_CACHE BUN_CACHE
# `--warmup 1`: untimed iteration before the timed runs so each PM enters
# its measurement window with DNS resolver cached, TLS session ticket
# primed, and the CDN edge POP populated. Without this, the first PM in
# the per-phase loop pays the cold-network tax (~+1s on p0) which the
# 3-run `--runs` mean cannot fully amortize, biasing the first PM
# systematically slow vs PMs that follow it. `--prepare` resets the
# filesystem state (lockfile / cache / node_modules) on every iteration
# — warmup included — so warmup leaves no on-disk artifact behind.
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if ! hyperfine \
--runs "$RUNS" \
--warmup 1 \
--prepare "bash $prep_script" \
--export-json "$json" \
--show-output \
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