🔥 An easy way to calculate the 'impact' of running a task in Node.JS
Coded with ❤️ by Simone Primarosa.
Synopsis
Sympact runs a script and profiles its execution time, CPU usage, and memory usage. Sympact then returns an execution report containing the averages of the results.
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How it works
sympact spawns a separate process and runs your script in an isolated
node process and then collects statistics about the system's resource used by
your script.
The data are collected using pidusage in combination with
pidtree.
The main difference between other projects is that sympact will also
"profile" processes spawned by your script or by any of its children.
Finally a report of the samples taken is computed and returned to you.
Install
npm install --save sympact
Usage
const impact = require('sympact');
const report = await impact(`
let r = 2;
let c = 10e7;
while (c--) r = Math.pow(r, r);
return r;
`, {interval: 125});
console.log(report.times.execution.end - report.times.execution.start);
console.log(report.stats.cpu.mean);
console.log(report.stats.memory.mean);
CLI
To make it more usable, a CLI is bundled with the package allowing for an aesthetically pleasing report.
npx sympact "console.log('Hello World')"
You can even require other files.
npx sympact "
const {spawn} = require('child_process');
let childno = 10;
let childs = [];
for (let i = 0; i < childno; i++) {
childs.push(spawn('node', ['-e', 'setInterval(()=>{let c=10e3;while(c--);},10)']));
}
let c = 10e6;
let m = {};
while (c--) m[c] = c;
for (let i = 0; i < childno; i++) {
childs[i].kill();
}
"
Report object
The object returned by the promise will look like this.
{
"times": {
"sampling": {
"start": 1521666020917,
"end": 1521666036041
},
"execution": {
"start": 1521666020958,
"end": 1521666036006
}
},
"stats": {
"cpu": {
"mean": 74.17368421052636,
"median": 75.1,
"stdev": 11.820700343128212,
"max": 94.7,
"min": 0.7
},
"memory": {
"mean": 1080202186.1052632,
"median": 1327509504,
"stdev": 416083837.44653314,
"max": 1327513600,
"min": 23441408
}
},
"samples": {
"period": 125,
"count": 114,
"list": {
"39": {
"cpu": 0.7,
"memory": 23441408,
"processes": [{
"cpu": 0.7,
"memory": 23441408,
"ppid": 837,
"pid": 839,
"ctime": 6000,
"elapsed": 1000,
"timestamp": 1521666020955
}]
},
"205": {
"cpu": 14.8,
"memory": 55685120,
"processes": [{
"cpu": 14.8,
"memory": 55685120,
"ppid": 837,
"pid": 839,
"ctime": 15000,
"elapsed": 2000,
"timestamp": 1521666021122
}]
},
[...]
"15124": {
"cpu": 81.2,
"memory": 878133248,
"processes": [{
"cpu": 81.2,
"memory": 878133248,
"ppid": 837,
"pid": 839,
"ctime": 47600,
"elapsed": 17000,
"timestamp": 1521666036041
}]
}
}
}
}
API
sympact(code, [options]) ⇒ Promise.<Object>
Measures the impact of running a certain script on your system.
Monitors the cpu and memory usage of the whole tree of processes generated by
the script provided.
Kind: global function
Returns: Promise.<Object>
- An object containing the results.
Access: public
Param | Type | Default | Description |
---|
code | string | | The source code to test. |
[options] | Object | | Optional configurations. |
[options.interval] | number | 125 | Sampling interval in milliseconds. |
[options.cwd] | string | "caller path" | CWD for the script. |
Contributing
Contributions are REALLY welcome and if you find a security flaw in this code, PLEASE report it.
Please check the contributing guidelines for more details. Thanks!
Authors
See also the list of contributors who participated in this project.
License
This project is licensed under the MIT License - see the license file for details.