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