Awesome
Rust Arg Parsing Benchmarks
This repo tries to assess Rust arg parsing performance.
We currently compare:
| Name | Style | Notes |
|---|---|---|
| No-op | N/A | N/A |
| argh | derive | |
| bpaf | Combinatoric or derive | |
| clap_lex | Imperative | No help generation |
| clap | Builder or derive | Color, suggested fixes, completions |
| gumdrop | derive | |
| lexopt | Imperative | No help generation |
| pico-args | Imperative | No help generation |
| xflags | proc-macro |
See also an examination of design trade offs
Note: any non-performance comparison is meant to provide context for what you gain/lose with each crate's overhead. For a full comparison, see each parser docs
Results
| Name | Overhead (release) | Build (debug) | Parse (release) | Invalid UTF-8 | Downloads | Version |
|---|---|---|---|---|---|---|
| null | 0 KiB | 234ms (full) <br/>172ms (incremental) | 3ms | Y | - | - |
| argh | 38 KiB | 3s (full) <br/>203ms (incremental) | 4ms | N |  | v0.1.10 |
| bpaf | 282 KiB | 965ms (full) <br/>236ms (incremental) | 5ms | Y |  | v0.9.4 |
| bpaf_derive | 276 KiB | 4s (full) <br/>238ms (incremental) | 5ms | Y | | v0.9.4 |
| clap | 654 KiB | 3s (full) <br/>392ms (incremental) | 4ms | Y |  | v4.4.0 |
| clap-minimal | 427 KiB | 2s (full) <br/>330ms (incremental) | 4ms | Y | | v4.4.0 |
| clap_derive | 689 KiB | 6s (full) <br/>410ms (incremental) | 4ms | Y | | v4.4.0 |
| clap_lex | 27 KiB | 407ms (full) <br/>188ms (incremental) | 3ms | Y |  | v0.5.1 |
| gumdrop | 37 KiB | 3s (full) <br/>198ms (incremental) | 3ms | N |  | v0.8.1 |
| lexopt | 34 KiB | 385ms (full) <br/>184ms (incremental) | 3ms | Y |  | v0.3.0 |
| pico-args | 23 KiB | 384ms (full) <br/>185ms (incremental) | 3ms | Y |  | v0.5.0 |
| xflags | 22 KiB | 709ms (full) <br/>179ms (incremental) | 3ms | Y |  | v0.3.1 |
System: Linux 5.4.0-124-generic (x86_64) w/ -j 8
rustc: rustc 1.72.0 (5680fa18f 2023-08-23)
Notes:
- Overhead will be lower if your application shares dependencies with your argument parsing library.
Running the Benchmarks
$ ./bench.py
$ ./format.py
To be included, the crate needs meet one of the following criteria:
- 10k+ recent downloads
- Unique API design
Special Thanks
- RazrFalcon for creating the initial benchmarks
- djc for inspiration with template-benchmarks-rs
- sharkdp for hyperfine