Struct usl::Measurement

pub struct Measurement {
    pub n: f64,
    pub x: f64,
    pub r: f64,
}

A simultaneous measurement of at least two of the parameters of Little’s Law: concurrency, throughput, and latency. The third parameter is inferred from the other two.

Measurement instances can be created from pairs of dimensional types: u32 for the number of concurrent events, f64 for the average rate of events, and Duration for the average duration of events:

use usl::Measurement;
use std::time::Duration;

let m: Measurement = (30, 1000.0).into();
let m: Measurement = (1000.0, 30).into();
let m: Measurement = (30, Duration::from_millis(200)).into();
let m: Measurement = (Duration::from_millis(200), 30).into();
let m: Measurement = (1000.0, Duration::from_millis(200)).into();
let m: Measurement = (Duration::from_millis(200), 1000.0).into();

Fields

n: f64

The average number of concurrent events.

x: f64

The long-term arrival rate of events, in events/sec.

r: f64

The average duration of events, in seconds.

Implementations

impl Measurement

pub fn concurrency_and_latency(n: u32, r: Duration) -> Measurement

Create a measurement of a system’s latency at a given level of concurrency. The throughput of the system is derived via Little’s Law.

pub fn concurrency_and_throughput(n: u32, x: f64) -> Measurement

Create a measurement of a system’s throughput at a given level of concurrency. The latency of the system is derived via Little’s Law.

pub fn throughput_and_latency(x: f64, r: Duration) -> Measurement

Create a measurement of a system’s latency at a given level of throughput. The concurrency of the system is derived via Little’s Law.

Trait Implementations

impl Clone for Measurement

fn clone(&self) -> Measurement

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Measurement

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<(Duration, f64)> for Measurement

fn from(v: (Duration, f64)) -> Self

Performs the conversion.

impl From<(Duration, u32)> for Measurement

fn from(v: (Duration, u32)) -> Self

Performs the conversion.

impl From<(f64, Duration)> for Measurement

fn from(v: (f64, Duration)) -> Self

Performs the conversion.

impl From<(f64, u32)> for Measurement

fn from(v: (f64, u32)) -> Self

Performs the conversion.

impl From<(u32, Duration)> for Measurement

fn from(v: (u32, Duration)) -> Self

Performs the conversion.

impl From<(u32, f64)> for Measurement

fn from(v: (u32, f64)) -> Self

Performs the conversion.

impl FromIterator<Measurement> for Model

fn from_iter<T: IntoIterator<Item = Measurement>>(iter: T) -> Self

Creates a value from an iterator.

impl Copy for Measurement