Function utilization 

pub fn utilization(arrival_rate: f64, service_rate: f64) -> Option<f64>

Utilization: arrival rate divided by service rate for a shared, capacity-constrained resource.

Arguments

• arrival_rate — rate at which new work arrives at the resource.
• service_rate — rate at which the resource can process work.

Returns

Some(utilization) as a fraction (e.g. 0.9 for 90% busy), or None when service_rate is zero.

Examples

use software_engineering::queueing_theory::utilization;

let u = utilization(9.0, 10.0).unwrap();
assert!((u - 0.9).abs() < 1e-9);
assert_eq!(utilization(9.0, 0.0), None);