This is a benchmark between multiple programs doing the task specified here (without file and argument parsing).

Executing run.sh builds the programs (with release profile) and then benchmarks them with Rust's integrated bencher.

As Rust's integrated bencher is unstable, a nightly toolchain is required. Recommended installation method is obtaining rustup.rs (a Rust toolchain manager) and running rustup override add nightly in this directory.

More versions are welcome! Just send a pull request. I can take care of adding it to the benchmark.

Credits:

• Rust version by me (Bobo1239)
• D version by Stefan

Results on my laptop (i7-6600U):

test d_dmd ... bench:  41,720,325 ns/iter (+/- 2,205,311)
test d_ldc ... bench:  14,314,630 ns/iter (+/- 2,000,920)
test rust  ... bench:  11,573,562 ns/iter (+/- 864,141)

Bonus Round

With test.large which is 370 Mb and not included in this repository. Only tested with a simple time cat test.large | <prog> (warmed file cache).

• Rust: 1.166s
• D (dmd): 4.106s
• D (ldc): 1.329s