Testing confirms thin and fat LTO produce equivalently useful PGO data
charliermarsh · x · 2026-10-10
Charlie Marsh closes the thread with his test results: since thin and fat LTO share the same pre-link pipeline, he expected both to generate equivalently useful PGO profiling data — and his testing shows no meaningful difference, backing the thin-LTO-for-PGO build speedup.
Related event: Ruff Author Finds ThinLTO Dramatically Speeds Up PGO Builds(4 posts)→
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