Wyrd

Wyrd is a tool for measuring performance of specific areas or functions in your application for a specific time bucket.

Table of contents

• What is a wyrd
• Motivation
• Installing
• Example

What is a wyrd?

From Wikipedia;

Wyrd is a feminine noun, and its Norse cognate urðr, besides meaning "fate", is the name of one of the Norns; urðr is literally "that which has come to pass".

Motivation

In certain applications, for example a canvas application, there is often a need to discover how many times a function is called, or how much time on average is spent on that function. That is what this tool tries to solve. With this tool it is possible to iteratively identify the bottlenecks in your application.

Installing

Using npm:

npm install wyrd

Using yarn:

yarn add wyrd

Using unpkg CDN:

<script src="https://unpkg.com/wyrd/dist/index.umd.js"></script>

Example

note: ES Module example

Get the Wyrd object

import { Wyrd } from "wyrd";

Alternatively you can get measureManager object, which is the same object.

import { measureManager } from ".wyrd";

With this object you can register a measures.

Wyrd.registerMeasure("measure-some-action");

Around the function execution you can mark start and end

function someFn() {
    Wyrd.markMeasureStart("measure-some-action");
    // this is some repeating function that you'd like to know how much time 
    // it spent on average in a given time bucket
    actionToMeasure();
    Wyrd.markMeasureEnd("measure-some-action");
}

At any time in the console, you can access this measurement

    const results = Wyrd.getResults("measure-some-action");

The results are a list of TimeBucketResult . They can be logged in the console, or sent to be collected elsewhere.

A Measure can be accessed directly

    const measure = Wyrd.getMeasures("measure-some-action");

If a measure is no longer needed, it can be finished (in which case no further measurements will occur).

    let isFinished = Wird.getMeasure("measure-some-action").isFinished // should be false
    Wyrd.finishMeasure("measure-some-action");
    isFinished = Wird.getMeasure("measure-some-action").isFinished // should be true