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# pidusage
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Cross-platform process cpu % and memory usage of a PID.
## Synopsis
Ideas from https://github.com/arunoda/node-usage but with no C-bindings.
Please note that if you need to check a Node.JS script process cpu and memory usage, you can use [`process.cpuUsage`][node:cpuUsage] and [`process.memoryUsage`][node:memUsage] since node v6.1.0. This script remain useful when you have no control over the remote script, or if the process is not a Node.JS process.
## Usage
```js
var pidusage = require('pidusage')
pidusage(process.pid, function (err, stats) {
console.log(stats)
// => {
// cpu: 10.0, // percentage (from 0 to 100*vcore)
// memory: 357306368, // bytes
// ppid: 312, // PPID
// pid: 727, // PID
// ctime: 867000, // ms user + system time
// elapsed: 6650000, // ms since the start of the process
// timestamp: 864000000 // ms since epoch
// }
cb()
})
// It supports also multiple pids
pidusage([727, 1234], function (err, stats) {
console.log(stats)
// => {
// 727: {
// cpu: 10.0, // percentage (from 0 to 100*vcore)
// memory: 357306368, // bytes
// ppid: 312, // PPID
// pid: 727, // PID
// ctime: 867000, // ms user + system time
// elapsed: 6650000, // ms since the start of the process
// timestamp: 864000000 // ms since epoch
// },
// 1234: {
// cpu: 0.1, // percentage (from 0 to 100*vcore)
// memory: 3846144, // bytes
// ppid: 727, // PPID
// pid: 1234, // PID
// ctime: 0, // ms user + system time
// elapsed: 20000, // ms since the start of the process
// timestamp: 864000000 // ms since epoch
// }
// }
})
// If no callback is given it returns a promise instead
const stats = await pidusage(process.pid)
console.log(stats)
// => {
// cpu: 10.0, // percentage (from 0 to 100*vcore)
// memory: 357306368, // bytes
// ppid: 312, // PPID
// pid: 727, // PID
// ctime: 867000, // ms user + system time
// elapsed: 6650000, // ms since the start of the process
// timestamp: 864000000 // ms since epoch
// }
// Avoid using setInterval as they could overlap with asynchronous processing
function compute(cb) {
pidusage(process.pid, function (err, stats) {
console.log(stats)
// => {
// cpu: 10.0, // percentage (from 0 to 100*vcore)
// memory: 357306368, // bytes
// ppid: 312, // PPID
// pid: 727, // PID
// ctime: 867000, // ms user + system time
// elapsed: 6650000, // ms since the start of the process
// timestamp: 864000000 // ms since epoch
// }
cb()
})
}
function interval(time) {
setTimeout(function() {
compute(function() {
interval(time)
})
}, time)
}
// Compute statistics every second:
interval(1000)
// Above example using async/await
const compute = async () => {
const stats = await pidusage(process.pid)
// do something
}
// Compute statistics every second:
const interval = async (time) => {
setTimeout(async () => {
await compute()
interval(time)
}, time)
}
interval(1000)
```
## Compatibility
| Property | Linux | FreeBSD | NetBSD | SunOS | macOS | Win | AIX | Alpine
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| `cpu` | ✅ | ❓ | ❓ | ❓ | ✅ | ℹ️ | ❓ | ✅ |
| `memory` | ✅ | ❓ | ❓ | ❓ | ✅ | ✅ | ❓ | ✅ |
| `pid` | ✅ | ❓ | ❓ | ❓ | ✅ | ✅ | ❓ | ✅ |
| `ctime` | ✅ | ❓ | ❓ | ❓ | ✅ | ✅ | ❓ | ✅ |
| `elapsed` | ✅ | ❓ | ❓ | ❓ | ✅ | ✅ | ❓ | ✅ |
| `timestamp` | ✅ | ❓ | ❓ | ❓ | ✅ | ✅ | ❓ | ✅ |
✅ = Working
ℹ️ = Not Accurate
❓ = Should Work
❌ = Not Working
Please if your platform is not supported or if you have reported wrong readings
[file an issue][new issue].
By default, pidusage will use `procfile` parsing on most unix systems. If you want to use `ps` instead use the `usePs` option:
```
pidusage(pid, {usePs: true})
```
## API
<a name="pidusage"></a>
### pidusage(pids, [options = {}], [callback]) ⇒ <code>[Promise.<Object>]</code>
Get pid informations.
**Kind**: global function
**Returns**: <code>Promise.<Object></code> - Only when the callback is not provided.
**Access**: public
| Param | Type | Description |
| --- | --- | --- |
| pids | <code>Number</code> \| <code>Array.<Number></code> \| <code>String</code> \| <code>Array.<String></code> | A pid or a list of pids. |
| [options] | <code>object</code> | Options object. See the table below. |
| [callback] | <code>function</code> | Called when the statistics are ready. If not provided a promise is returned instead. |
### options
Setting the options programatically will override environment variables
| Param | Type | Environment variable | Default | Description |
| --- | --- | --- | --- | --- |
| [usePs] | <code>boolean</code> | `PIDUSAGE_USE_PS`| `false` | When true uses `ps` instead of proc files to fetch process information |
| [maxage] | <code>number</code> | `PIDUSAGE_MAXAGE`| `60000` | Max age of a process on history. |
`PIDUSAGE_SILENT=1` can be used to remove every console message triggered by pidusage.
### pidusage.clear()
If needed this function can be used to delete all in-memory metrics and clear the event loop. This is not necessary before exiting as the interval we're registring does not hold up the event loop.
## Related
- [pidusage-tree][gh:pidusage-tree] -
Compute a pidusage tree
## Authors
- **Antoine Bluchet** - [soyuka][github:soyuka]
- **Simone Primarosa** - [simonepri][github:simonepri]
See also the list of [contributors][contributors] who participated in this project.
## License
This project is licensed under the MIT License - see the [LICENSE][license] file for details.
<!-- Links -->
[new issue]: https://github.com/soyuka/pidusage/issues/new
[license]: https://github.com/soyuka/pidusage/tree/master/LICENSE
[contributors]: https://github.com/soyuka/pidusage/contributors
[github:soyuka]: https://github.com/soyuka
[github:simonepri]: https://github.com/simonepri
[gh:pidusage-tree]: https://github.com/soyuka/pidusage-tree
[node:cpuUsage]: https://nodejs.org/api/process.html#process_process_cpuusage_previousvalue
[node:memUsage]: https://nodejs.org/api/process.html#process_process_memoryusage
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