rustHow to get execution time in Rust

Rust provides a number of ways to measure the execution time of a program.

The simplest way is to use the std::time::Instant type from the standard library. This type provides a now() method which returns an instance of Instant that can be used to measure the elapsed time.

Example code

use std::time::Instant;

let start = Instant::now();

// code to measure

let elapsed = start.elapsed();
println!("Time elapsed in expensive_function() is: {:?}", elapsed);

Output example

Time elapsed in expensive_function() is: Duration { secs: 0, nanos: 54545 }

Code explanation

• use std::time::Instant: imports the Instant type from the standard library.
• let start = Instant::now(): creates an instance of Instant which will be used to measure the elapsed time.
• let elapsed = start.elapsed(): calculates the elapsed time since the start instance was created.
• println!("Time elapsed in expensive_function() is: {:?}", elapsed): prints the elapsed time.

Helpful links

• std::time::Instant

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