75 lines
1.8 KiB
Lua
75 lines
1.8 KiB
Lua
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--[[
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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 { 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(math.abs((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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