FRand

FRand is a blazingly fast, small, and simple pseudo-random number generator (PRNG) written in Rust. The advantage of using FRand is that it can produce more random numbers per second than other libraries. It also produces high-quality random numbers using a fast non-cryptographic hashing algorithm.

To find the best constants for the algorithm, I used an automated program that tried many random constants per second and measured the bias of the output. The bias was estimated using the avalanche effect, which is a property of good hash functions that ensures that a small change in the input produces a large change in the output. The program selected the constants that minimized the bias and maximized the randomness.

Usage

This crate is available on crates.io and can be used by adding frand to your dependencies in your project's Cargo.toml.

[dependencies]
frand = "0.10"

FRand is really simple to use. Here is a simple example of how to use FRand to generate a random float:

use frand::Rand;

let mut rng = Rand::new();
println!("{}", rng.gen::<f32>());

Speeds

u64

f64

u128

If you have suggestions on how to improve this library, you can contribute to this project!