[Solved-6 Solutions] How to measure time taken by a function to execute - javascript tutorial
Problem:
How to measure time taken by a function to execute ?
Solution 1:
You can try this :
var measure = require('measure');
var collectTime = measure.measure('timer1');
// measure first time
collectTime();
setTimeout(function() {
// measure second time
collectTime();
}, 100);
setTimeout(function() {
// measure third time
collectTime();
console.log(measure.stats('timer1'));
}, 1000);
Output:
[~/]$ node measureTime.js
{ ct: 3, total: 1105, max: 1002, min: 0 }Solution 2:
We can use console.time: (non-standard)
console.time('someFunction');
someFunction(); // run whatever needs to be timed in between the statements
console.timeEnd('someFunction');
We could use the standard performance.now() API:
var t0 = performance.now();
doSomething();
var t1 = performance.now();
console.log("Call to doSomething took " + (t1 - t0) + " milliseconds.")
Read Also
Settimeout or setintervalSolution 3:
Use new Date().getTime().
The getTime() method returns the number of milliseconds.
var start = new Date().getTime();
for (we = 0; we < 50000; ++i) {
// do something
}
var end = new Date().getTime();
var time = end - start;
alert('Execution time: ' + time);
Solution 4:
To get precise values we should use Performance interface . It's supported in modern versions of Firefox, Chrome , Opera and IE.
var performance = window.performance;
var t0 = performance.now();
doWork();
var t1 = performance.now();
console.log("Call to doWork took " + (t1 - t0) + " milliseconds.")
Solution 5:
Use add operator:
var start = +new Date()
for (i = 0; i < 50000; ++i) {
// do something
}
var end = +new Date()
var time = end - start;
console.log('total execution time = '+ time + 'ms');Solution 6:
process.hrtime() is available within Node.js - It returns a value in nanoseconds.
var hrTime = process.hrtime()
console.log(hrTime[0] * 1000000 + hrTime[1] / 1000)