PerfPro: Node.js performance profiler

PerfPro is a wrapper for the high-resolution Node.js Performance measurement API.

PerfPro objects are initialized with a name so you can record and analyse my-app-or-module performance without affecting another-app-or-module. Two or more PerfPro objects initialized with the same name share data across a whole application.

Installation

npm install perfpro

Example

// initialize app performance object
import { PerfPro } from 'perfpro';
const perf = new PerfPro('my-app');

// mark the start of an operation
perf.mark('process-data');

// ... operations ...

// mark the end of the operation
perf.mark('process-data');

// get the duration in milliseconds
// e.g. 42.552
console.log( perf.duration('process-data') );

// get all durations as an array of objects
// [ { name: 'process-data', duration: 42.552 }, ... ]
console.log( perf.allDurations() );

// clear a specific app mark
perf.clear('process-data');

// clear all marks for the app
perf.clear();

// show time since application started
console.log( perf.now() );

API

new PerfPro(appName)

Creates a new performance profiler instance.

• appName (string): the application/namespace name (used to identify marks).

mark(name)

Records a performance mark. Call twice with the same name to set start and end.

• name (string): the mark name

duration(name)

Returns the duration in milliseconds between the first and last mark made. If only one mark exists, it measures from the first mark to now.

• name (string): the mark name.
• returns: number | undefined

allDurations(limit, omit)

Returns an array of { name, duration } objects for all marks.

• limit (array, optional): names to include ** omit (array, optional): names to exclude

clear(name)

Clears marks for the app.

• name (string, optional): mark name. Pass nothing to to clear all marks for the app.

now()

Returns time since application started.