I’ve just tested this out with the wasmtime repository (e.g. something including CraneLift) to get on a 14 core (28 hyperthread) machine:
| Full Build Type | Default | Pipelined | Difference |
|---|---|---|---|
| debug | 39.5s | 33.8s | 14.6% faster |
| release | 52.4s | 45.5s | 13.1% faster |
Then after touch wasmtime-obj/src/lib.rs
| Build type | Default | Pipelined | Diffference |
|---|---|---|---|
| debug | 4.17s | 4.06s | 2.6% faster |
| release | 2.50s | 2.47s | 1.2% faster |
Then after find . -name '*.rs' | xargs touch
| Build type | Default | Pipelined | Diffference |
|---|---|---|---|
| debug | 7.24s | 7.26s | 0.3% slower |
| release | 9.73s | 7.54s | 22.5% faster |
(note that I don’t really know that much about wasmtime/CraneLift, just wanted to test something that I figured was mostly Rust code with not a ton of procedural macros and/or C code!)