--[[ Licensed under GNU General Public License v2 * (c) 2013, Luke Bonham * (c) 2010-2012, Peter Hofmann --]] local helpers = require("lain.helpers") local wibox = require("wibox") local math = { ceil = math.ceil } local string = { format = string.format, gmatch = string.gmatch } local tostring = tostring local setmetatable = setmetatable -- CPU usage -- lain.widgets.cpu local cpu = { core = {} } local function worker(args) local args = args or {} local timeout = args.timeout or 2 local settings = args.settings or function() end cpu.widget = wibox.widget.textbox() function update() -- Read the amount of time the CPUs have spent performing -- different kinds of work. Read the first line of /proc/stat -- which is the sum of all CPUs. local times = helpers.lines_match("cpu","/proc/stat") for index,time in pairs(times) do local coreid = index - 1 local core = cpu.core[coreid] or { last_active = 0 , last_total = 0, usage = 0 } local at = 1 local idle = 0 local total = 0 for field in string.gmatch(time, "[%s]+([^%s]+)") do -- 4 = idle, 5 = ioWait. Essentially, the CPUs have done -- nothing during these times. if at == 4 or at == 5 then idle = idle + field end total = total + field at = at + 1 end local active = total - idle if core.last_active ~= active or core.last_total ~= total then -- Read current data and calculate relative values. local dactive = active - core.last_active local dtotal = total - core.last_total local usage = math.ceil((dactive / dtotal) * 100) core.last_active = active core.last_total = total core.usage = usage -- Save current data for the next run. cpu.core[coreid] = core end end cpu_now = cpu.core cpu_now.usage = cpu_now[0].usage widget = cpu.widget settings() end helpers.newtimer("cpu", timeout, update) return cpu end return setmetatable(cpu, { __call = function(_, ...) return worker(...) end })