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77 lines
2.1 KiB
77 lines
2.1 KiB
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--[[ |
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Licensed under GNU General Public License v2 |
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* (c) 2013, Luke Bonham |
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* (c) 2010-2012, Peter Hofmann |
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--]] |
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local first_line = require("lain.helpers").first_line |
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local newtimer = require("lain.helpers").newtimer |
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local wibox = require("wibox") |
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local math = { ceil = math.ceil } |
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local string = { format = string.format, |
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gmatch = string.gmatch } |
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local tostring = tostring |
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local setmetatable = setmetatable |
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-- CPU usage |
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-- lain.widgets.cpu |
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local cpu = { |
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last_total = 0, |
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last_active = 0 |
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} |
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local function worker(args) |
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local args = args or {} |
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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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cpu.widget = wibox.widget.textbox('') |
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function 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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local times = first_line("/proc/stat") |
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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(times, "[%s]+([^%s]+)") |
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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 |
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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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-- Read current data and calculate relative values. |
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local dactive = active - cpu.last_active |
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local dtotal = total - cpu.last_total |
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cpu_now = {} |
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cpu_now.usage = tostring(math.ceil((dactive / dtotal) * 100)) |
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widget = cpu.widget |
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settings() |
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-- Save current data for the next run. |
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cpu.last_active = active |
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cpu.last_total = total |
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end |
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newtimer("cpu", timeout, update) |
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return cpu.widget |
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end |
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return setmetatable(cpu, { __call = function(_, ...) return worker(...) end })
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