pidusage

Process cpu % and memory use of a PID

Ideas from https://github.com/arunoda/node-usage/ but with no C-bindings

API

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var pusage = require('pidusage')

pusage.stat(process.pid, function(err, stat) {

    expect(err).to.be.null
    expect(stat).to.be.an('object')
    expect(stat).to.have.property('cpu')
    expect(stat).to.have.property('memory')

    console.log('Pcpu: %s', stat.cpu)
    console.log('Mem: %s', stat.memory) //those are bytes

})

// Unmonitor process
pusage.unmonitor(18902);

What do this script do?

A check on the os.platform is done to determine the method to use.

Linux

We use /proc/{pid}/stat in addition to the the PAGE_SIZE and the CLK_TCK direclty from getconf() command. Uptime comes from proc/uptime file because it's more accurate than the nodejs os.uptime().

On darwin, freebsd, solaris (tested on 10/11)

We use a fallback with the ps -o pcpu,rss -p PID command to get the same informations.

On AIX

AIX is tricky because I have no AIX test environement, at the moment we use: ps -o pcpu,rssize -p PID but /proc results should be more accurate! If you're familiar with the AIX environment and now how to get the same results as we've got with Linux systems, please help. #4

Windows

Windows is really tricky, atm it uses the wmic.exe, feel free to share ideas on how to improve this.

Licence

MIT