#benchmark #criterion #testing #timing #optimization

app rust-timeit

Tool for measuring execution time of small Rust code snippets

2 unstable releases

0.3.0 Jan 22, 2021
0.2.0 Jan 19, 2021

#41 in Profiling


245 lines

crates.io license


This package provides a simple way of timing small bits of Rust code. It essentially serves as a command-line wrapper for criterion, allowing for quickly running micro-benchmark tasks.

It takes its inspiration, and some of its form, from Python's timeit library.


To install the stable version, install Rust and run cargo install rust-timeit.

To install from source, run cargo install --path . from the main directory.


Which way of creating a zero-length string is fastest?

rust-timeit --perf instructions --setup 'let empty = String::new()' 'String::new()' 'String::from("")' 'empty.clone()' '"".to_owned()'

(Hint: String::new() is fastest)


Copyright [2021] Bruce Guenter

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.


~27K SLoC