FutoIn OptiHelp utility

FutoIn OptiHelp is Node.js module optimization helper.

Unlike simple benchmark tools, FutoIn OptiHelp stores base and best results. It helps you to understand how new optimization and other changes affect performance of your project over time.

Documentation —> FutoIn Guide

Author: Andrey Galkin

Installation for Node.js

Command line:

$ npm install @futoin/optihelp --save


$ yarn add @futoin/optihelp --save

Concept & notes

  1. Tests are unique per CPU model and Node.js version.

    • The combination is obfuscated with SHA-256 hash for minor security and ease of result management.
  2. History of test results is stored under test/results in project root by default.

    • See OptiHelper dst_root option.
  3. Upon first run, only benchmark results are shown. This results are called “base”.
  4. Upon any subsequent run, OptiHelper also shows different to “base” and “best” ever values.
  5. Benchmark sequence:

    • calibration run (single shot),
    • warmup run based on test_time*warmup_ratio options,
    • actual benchmark for test_time option,
    • after all tests are done, additional benchmark passes may run (pass option).
  6. Optional profiling uses v8-profiler module.
  7. The result is dumped in stdout, but an overall machine readable report is also generated.
  8. process.hrtime() with nanosecond resolution is used.


  1. Create optihelp.js in your tests folder with Suite of tests.
  2. Run the first ever cycle to get “base” results.
  3. Commit changes and the results.
  4. Create a branch of your project, for example optimization-refdata.

    • It would be helpful when you’ll want to add extra tests.
  5. Make optimization and/or other changes
  6. Run the optihelp.js test again and observe the results.


const optihelp = require('@futoin/optihelp');

optihelp('Suite Name', { test_time : 5, pass : 3 } )
    .test( 'Async Test', (done) => { /* ... */; done() } )
    .test( 'Sync Test', () => { /* ... */; } )
    .start((report) => console.log(report));

API documentation


Module Optimization Helper

Kind: global class

new OptiHelper(name, options)


Param Type Default Description
name string suite name
options object various options
options.pass integer 2 how many passes to run
options.dst_root string ” ’ test/results ’ ” result history folder
options.test_time float 5 how long to run a single pass of each test in seconds
options.warmup_ratio float 1 how long to warmup based on test_time
options.profile_ratio float 0.1 how long to profile based on test_time
options.do_profile boolean false run v8-profiler, if true
options.check_prod boolean true ensure running in production env
options.report_file string null store report in file, if true

optiHelper.test(name, cb) ⇒ OptiHelper

Execute test several times

Kind: instance method of OptiHelper
Returns: OptiHelper - self for chaining

Param Type Description
name string test name
cb callable test callback


Start execution of tests

Kind: instance method of OptiHelper

Param Type Description
cb callable completion callback