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-- System: CPU load as a per-core equaliser, memory, and every temperature.
--
-- The hwmon bindings and temperature ceilings below are host-specific, which
-- is why they live here rather than in lib/data.lua: that file is the part
-- that ports to another machine, this is the part that does not.
local card = require 'lib.card'
local data = require 'lib.data'
local M = {}
-- chip, file, label, warn, crit.
--
-- Ceilings are per sensor because a single pair cannot serve both: 70C is
-- unremarkable on a CPU package and alarming on an NVMe. Starting values,
-- easy to retune once real numbers under load are known.
local TEMPS = {
{ 'k10temp', 'temp1_input', 'CPU', 75, 90 },
{ 'k10temp', 'temp3_input', 'CCD1', 75, 90 },
{ 'nvme', 'temp1_input', 'NVME', 60, 70 },
{ 'gigabyte_wmi', 'temp2_input', 'BOARD', 60, 70 },
{ 'gigabyte_wmi', 'temp3_input', 'BOARD', 60, 70 },
}
-- One counter per core, created on first draw and kept for the process's life:
-- load is a delta between samples, so the state has to outlive the frame.
local counters = {}
local total_counter = data.new_cpu_counter()
function M.draw(cr, rect, colors)
local inner = card.card(cr, rect, colors)
local function clamp(v, lo, hi) return math.max(lo, math.min(hi, v)) end
local label_size = clamp(inner.w * 0.030, 11, 18)
local big_size = clamp(inner.w * 0.085, 26, 56)
local row_size = clamp(inner.w * 0.030, 11, 17)
local stat = data.slurp('/proc/stat')
local agg_total, agg_idle = data.cpu_times(stat or '')
local load = total_counter:sample(agg_total, agg_idle)
local y = inner.y
-- Aggregate load, the headline number.
card.font(cr, card.FONT_MONO, label_size, false)
card.rgba(cr, colors.label)
card.text(cr, inner.x, y + label_size, 'CPU')
card.font(cr, card.FONT_HEAVY, big_size, false)
card.rgba(cr, load and card.threshold(load, 25, 75, colors) or colors.label)
card.text(cr, inner.x, y + label_size + big_size,
load and string.format('%d%%', math.floor(load + 0.5)) or '--')
local ey = y + label_size + big_size + 14
-- The equaliser: one bar per core, rising from a common baseline.
local cores = data.per_cpu_times(stat or '')
local n = #cores
if n > 0 then
local gap = math.max(2, inner.w * 0.006)
local bw = (inner.w - gap * (n - 1)) / n
local eh = clamp(inner.h * 0.42, 24, 220)
-- Below about 3px a row of sixteen bars is an illegible smear; drop to the
-- aggregate bar instead of drawing one.
if bw >= 3 then
for i, c in ipairs(cores) do
counters[i] = counters[i] or data.new_cpu_counter()
local pct = counters[i]:sample(c.total, c.idle) or 0
card.vbar(cr, inner.x + (i - 1) * (bw + gap), ey + eh, bw, eh,
pct / 100, card.threshold(pct, 25, 75, colors), colors)
end
else
card.bar(cr, inner.x, ey + eh - 8, inner.w, 8, (load or 0) / 100,
card.threshold(load or 0, 25, 75, colors), colors)
end
ey = ey + eh + 16
end
-- Memory. MemAvailable, not free: it already excludes reclaimable cache, so
-- it is the figure a person recognises as "used".
local mem = data.mem_info(data.slurp('/proc/meminfo') or '')
if mem then
local frac = mem.used / mem.total
card.font(cr, card.FONT_MONO, row_size, false)
card.rgba(cr, colors.label)
card.text(cr, inner.x, ey, 'RAM')
card.rgba(cr, colors.value)
card.text_right(cr, inner.x + inner.w, ey,
string.format('%s / %s', card.human(mem.used * 1024), card.human(mem.total * 1024)))
ey = ey + 8
card.bar(cr, inner.x, ey, inner.w, 8, frac,
card.threshold(frac * 100, 25, 75, colors), colors)
ey = ey + 22
end
-- Temperatures, each against its own ceiling.
card.font(cr, card.FONT_MONO, row_size, false)
local step = row_size * 1.8
for _, t in ipairs(TEMPS) do
if ey + step > inner.y + inner.h then break end -- out of room: stop
local v = data.sensor(t[1], t[2])
card.rgba(cr, colors.label)
card.text(cr, inner.x, ey, t[3])
card.rgba(cr, v and card.threshold(v, t[4], t[5], colors) or colors.label)
card.text_right(cr, inner.x + inner.w, ey,
v and string.format('%d\u{00B0}', v) or '--')
ey = ey + step
end
end
return M
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