node-sjsp's Introduction

node-sjsp - Simple JavaScript Profiler

What is it

This is a JavaScript profiler implemented in Node.js, inspired by sjsp, which is implemented in Haskell.

How to install

npm -g install node-sjsp

Usage

If you want to inject profiling code into something.js, run

sjsp something.js

and then sjsp generates something.sjsp.js in the same directory. (you can use wildcard characters such that sjsp *.js)

Next, rewrite your HTML code using something.js like below.

<!-- <script src="something.js"></script> -->
<script src="something.sjsp.js"></script>

Open the page with your browser and you can see profiles in the JavaScript console every 10 seconds. (you can change this interval by -i option)

========== SORT BY TIME ==========
time:    0.60sec   count:    1777    something.js          test1   (line:   7, col: 17)   function test1(){
time:    0.60sec   count:    1701    something.js          test0   (line:   1, col: 17)   function test0(){
time:    0.58sec   count:    1601    something.js          test4   (line:  25, col: 17)   function test4(){
time:    0.57sec   count:    1703    something.js          test2   (line:  13, col: 17)   function test2(){
time:    0.54sec   count:    1632    something.js          test3   (line:  19, col: 17)   function test3(){
time:    0.53sec   count:    1586    something.js          test5   (line:  31, col: 17)   function test5(){
========== SORT BY COUNT ==========
time:    0.60sec   count:    1777    something.js          test1   (line:   7, col: 17)   function test1(){
time:    0.57sec   count:    1703    something.js          test2   (line:  13, col: 17)   function test2(){
time:    0.60sec   count:    1701    something.js          test0   (line:   1, col: 17)   function test0(){
time:    0.54sec   count:    1632    something.js          test3   (line:  19, col: 17)   function test3(){
time:    0.58sec   count:    1601    something.js          test4   (line:  25, col: 17)   function test4(){

For details, see original document