Update benchmark with Rust nightly-2025-09-01 and itoa 1.0.15 #60
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`RUSTFLAGS=-Ctarget-cpu=native cargo bench` on x86_64 AMD Ryzen Threadripper 2990WX.
dtolnay
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Sep 1, 2025
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Looking more into this significant regression in libstd times, it seems to be relatively recent but spread over multiple Rust releases. Here are the recent u64::MAX timings (the others follow a similar ratio):
- Rust 1.50–1.82: 23ns
- Rust 1.83–1.86: 26ns
- Rust 1.87–1.90-beta: 28ns
- Rust 1.91-nightly: 34ns
The regression in 1.91 bisects to nightly-2025-08-29.
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Based on RUSTFLAGS=-Ctarget-cpu=native cargo bisect-rustc --start 2025-08-28 --end 2025-08-29 --prompt -- bench bench_std_fmt::bench_u64_max it's rust-lang/rust#145877.
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Closes #59.
Measured using
RUSTFLAGS=-Ctarget-cpu=native cargo benchon x86_64 AMD Ryzen Threadripper 2990WX.