whats-the-damage
v2.0.3
Published
What's the damage? ...of running that script in real time, CPU time, and memory usage
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What's the Damage? ...of running that script in time, CPU and memory usage
Runs scripts and benchmarks their execution time, CPU usage, and memory usage by running each script many times, and returning an average of all results.
Install:
npm install whats-the-damage
Usage:
import DamageOf from 'whats-the-damage';
DamageOf([
'/path/to/script1.js',
'/path/to/script2.js'
]).then(damages => {
console.log(damages);
})
(because it's a promise you can await
the results too of course)
The promise will return an array of results, each of which look like...
{
"time": AVERAGE,
"cpu": {
"user": AVERAGE,
"system": AVERAGE
},
"memory": {
"rss": AVERAGE,
"heapTotal": AVERAGE,
"heapUsed": AVERAGE,
"external": AVERAGE
},
"snapshot": {
"everyMilliseconds": 1000,
"snapshots": [
{
"cpu": AVERAGE,
"memory": AVERAGE,
"time": AVERAGE
},
{
"cpu": AVERAGE,
"memory": AVERAGE,
"time": AVERAGE
},
...
]
},
"exitCode": 0,
"repeat": 10
}
AVERAGE is a statistical analysis of multiple executions of your script which looks like,
{
"mean": 5.584533965,
"median": 5.584533965,
"standardDeviation": 0.08703098499999973,
"max": 5.67156495,
"min": 5.49750298
}
So if you just want to see how long (on average) your script takes to run you could...
const damages = await DamageOf(['/path/to/script1.js']);
console.log(damages[0].time.mean);
How does it work?
It forks your scripts and runs them sequentially while monitoring the processes' memory, CPU usage, and duration.
API
DamageOf
DamageOf(pathsArray, OPTIONS);
I've already explained the first argument (an array of full script paths).
OPTIONS is an optional object that is merged with default options, which are,
async: false, // Boolean.
// Running tests in parallel will cause eratic results.
// so not recommended to set to true.
// Perhaps useful if you're trying to get a quick and
// broad overview of results though.
snapshotEveryMilliseconds: 1000, // number in milliseconds
// when watching the script, snapshot
// the memory/cpu/time this frequently
repeat: 10, // number of times to run each script
progress: (...args) => {} // A callback that receives progress updates
// because benchmarks can take a while.
// Defaults to printing to console.log.
// Can be set to null to silence it.
// The args can be anything and this isn't yet
// standardised
getEnvironment()
Returns an object that looks like,
{
versions: process.versions,
arch: os.arch(),
cpus: os.cpus(),
totalmem: os.totalmem(),
type: os.type()
}
Useful for distinguishing benchmarks across different machines.
See the Node.js docs for process
and os
for more.
whats-the-damage
is part of the XML-Zero.js project.