performance-time

Task-based performance measurement utility. performance-time measures the execution time of the code you want to check.

Patch Note

• 1.1.0

Added Warmup task that runs before running first task.

As a result, the initial task no longer runs quickly. (Fixed bug)

swap1(), swap2() tasks result:
[ { task: 'swap1', repeat: 200000000, time: 620 },
  { task: 'swap2', repeat: 200000000, time: 611 } ]

API Reference

addTask(task1 [, task2, ..., taskN])

Add name of the tasks to measure performance. Tasks must be executable functions or methods.

clearTask()

Delete all tasks added through addTask.

run([obj.repeat])

Run the all added tasks and return performance time result. If add the repeat option, it will apply only to this run. Otherwise, the default(repeat = 100000) is applied.

result()

Returns Array about performance time result of the last run.

Installation

npm install performance-time

How to use

// ES5 version sample code.
var Performance= require('performance-time');
var perf = new Performance({repeat:100000000});

// Add the task-functions
perf.addTask(swap1, swap2);

// Run the all added tasks and print report about the run.
console.log('Way1: ', perf.run());
    //Way1:  [ { task: 'swap1', repeat: 100000000, time: 60 },
    //	{ task: 'swap2', repeat: 100000000, time: 470 } ]

// Or
perf.run({repeat:300});		// 'repeat' only apply to this run.
console.log('Way2: ', perf.result());
    //Way2:  [ { task: 'swap1', repeat: 300, time: 0 },
    //	{ task: 'swap2', repeat: 300, time: 0 } ]


// Clear all tasks added on perf.
perf.clearTask();


/* --- Tasks */
// Traditional swap which uses three variables
function swap1() {
    var a=1, b=2;
    var temp = a;

    a=b;
    b=temp;

    if(a !== 2 || b !== 1)
        console.error('swap fail: ', a, b);
}

// Swap which only uses two variables
function swap2() {
    var a = 1, b = 2;

    a = a ^ b;
    b = a ^ b;
    a = a ^ b;

    if(a !== 2 || b !== 1)
        console.error('swap fail: ', a, b);
}