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-----------------------------------
-- Author: Uli Schlachter --
-- Copyright 2009 Uli Schlachter --
-----------------------------------
local io = io
local tonumber = tonumber
local pairs = pairs
local setmetatable = setmetatable
local lib = {
widget = require("obvious.lib.widget")
}
module("obvious.cpu")
local function cpu_info()
local f = io.open("/proc/stat")
local line = f:read()
local ret = { }
local matches = line:gmatch("%d+")
f:close()
-- each time matches() is called it returns the next number from line
ret.user = tonumber(matches())
ret.nice = tonumber(matches())
ret.system = tonumber(matches())
ret.idle = tonumber(matches())
ret.iowait = tonumber(matches())
ret.irq = tonumber(matches())
ret.softirq = tonumber(matches())
-- The returned array contains numbers which describe the time in number of
-- jiffies since this box was started
return ret
end
local function cpu_usage(object)
local last = object.cpu_last
local cur = cpu_info()
object.cpu_last = cur
-- Fake for starting
if last == nil then
last = cur
end
local ret = { }
for k, v in pairs(cur) do
ret[k] = cur[k] - last[k]
end
-- Calculate the cpu usage in percent
-- Ignore iowait (dunno...)
local t = ret.user + ret.nice + ret.system + ret.irq + ret.softirq
if (t + ret.idle) == 0 then
ret.perc = 0
else
ret.perc = 100 * t / (t + ret.idle)
end
-- This array now got the following keys (time is in jiffies!):
-- * user user cpu time
-- * nice cpu time for nice'd processes
-- * system cpu time spent in syscalls
-- * idle cpu time spent idlying
-- * iowait cpu time spent waiting for I/O
-- * irq cpu time spent in irq handlers
-- * softirq cpu time spent in soft irq handlers
-- * perc percentage of time spent doing stuff
return ret
end
local function get_data_source()
local ret = {}
ret.max = 100
ret.get = function(obj)
return cpu_usage(obj).perc
end
return lib.widget.from_data_source(ret)
end
setmetatable(_M, { __call = function (_, ...) return get_data_source(...) end })
-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=4:softtabstop=4:encoding=utf-8:textwidth=80
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