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b6ecb9c1f4fd80cf5811eb102655beb524bb909e
[etc/awesome.git] / widget / cpu.lua
1 --[[
2
3      Licensed under GNU General Public License v2
4       * (c) 2013,      Luke Bonham
5       * (c) 2010-2012, Peter Hofmann
6
7 --]]
8
9 local helpers  = require("lain.helpers")
10 local wibox    = require("wibox")
11 local math     = { ceil   = math.ceil }
12 local string   = { format = string.format,
13                    gmatch = string.gmatch }
14 local tostring = tostring
15
16 -- CPU usage
17 -- lain.widget.cpu
18
19 local function factory(args)
20     local cpu      = { core = {}, widget = wibox.widget.textbox() }
21     local args     = args or {}
22     local timeout  = args.timeout or 2
23     local settings = args.settings or function() end
24
25     function cpu.update()
26         -- Read the amount of time the CPUs have spent performing
27         -- different kinds of work. Read the first line of /proc/stat
28         -- which is the sum of all CPUs.
29         local times = helpers.lines_match("cpu","/proc/stat")
30
31         for index,time in pairs(times) do
32             local coreid = index - 1
33             local core   = cpu.core[coreid] or
34                            { last_active = 0 , last_total = 0, usage = 0 }
35             local at     = 1
36             local idle   = 0
37             local total  = 0
38
39             for field in string.gmatch(time, "[%s]+([^%s]+)") do
40                 -- 4 = idle, 5 = ioWait. Essentially, the CPUs have done
41                 -- nothing during these times.
42                 if at == 4 or at == 5 then
43                     idle = idle + field
44                 end
45                 total = total + field
46                 at = at + 1
47             end
48
49             local active = total - idle
50
51             if core.last_active ~= active or core.last_total ~= total then
52                 -- Read current data and calculate relative values.
53                 local dactive = active - core.last_active
54                 local dtotal  = total - core.last_total
55                 local usage   = math.ceil((dactive / dtotal) * 100)
56
57                 core.last_active = active
58                 core.last_total  = total
59                 core.usage       = usage
60
61                 -- Save current data for the next run.
62                 cpu.core[coreid] = core
63             end
64         end
65
66         cpu_now = cpu.core
67         cpu_now.usage = cpu_now[0].usage
68         widget = cpu.widget
69
70         settings()
71     end
72
73     helpers.newtimer("cpu", timeout, cpu.update)
74
75     return cpu
76 end
77
78 return factory