8 unstable releases (3 breaking)
0.10.1 | Sep 21, 2024 |
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0.10.0 | May 23, 2024 |
0.9.0 | May 14, 2024 |
0.8.1 | Sep 19, 2023 |
0.7.3 | Aug 9, 2023 |
#1249 in Algorithms
Used in 3 crates
22KB
461 lines
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.
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
rand::ThreadRng | rand::SmallRng | fastrand::Rng | frand::Rand |
---|---|---|---|
1.00x | 3.74x | 5.80x | 6.09x |
f64
rand::ThreadRng | rand::SmallRng | fastrand::Rng | frand::Rand |
---|---|---|---|
1.00x | 3.79x | 2.34x | 5.57x |
u128
rand::ThreadRng | rand::SmallRng | fastrand::Rng | frand::Rand |
---|---|---|---|
1.00x | 2.15x | 6.79x | 7.24x |
If you have suggestions on how to improve this library, you can contribute to this project!
Dependencies
~3.5MB
~118K SLoC