cpu load

gistfile1.coffee

_ = require 'underscore'
http = require 'http'
fs = require 'fs'

every = (delay, cb) ->
  setInterval cb, delay*1000

prev_total = prev_idle = 0

every 1, ->
  fs.readFile '/proc/stat', (err, data) ->
    parse data.toString()

calc_load = (total, idle) ->
    d_total = total - prev_total
    d_idle = idle - prev_idle
    prev_total = total
    prev_idle = idle
    (d_total - d_idle) / d_total * 100
    
parse = (data) ->
    stats = data.match(/^cpu[^0-9]*([ [0-9]*]*).*/)?[1].trim().split ' '
    idle = stats[3]*1
    total = stats[0..3].reduce (t, s) -> t*1 + s*1
    load = calc_load total, idle
    console.log load