awesome/tests/test-benchmark.lua

-- Some benchmarks that aren't really tests, but are included here anyway so
-- that we notice if they break.

local runner = require("_runner")
local awful = require("awful")
local GLib = require("lgi").GLib
local create_wibox = require("_wibox_helper").create_wibox

local BENCHMARK_EXACT = os.getenv("BENCHMARK_EXACT")
if not BENCHMARK_EXACT then
    print("Doing quick and inexact measurements. Set BENCHMARK_EXACT=1 as an "..
          "environment variable when you actually want to look at the results.")
end

local measure, benchmark
do
    local timer_measure = GLib.Timer()
    measure = function(f, iter)
        timer_measure:start()
        for _ = 1, iter do
            f()
        end
        local elapsed = timer_measure:elapsed()
        return elapsed / iter, elapsed
    end

    local timer_benchmark = GLib.Timer()
    benchmark = function(f, msg)
        timer_benchmark:start()
        local iters = 1
        local time_per_iter, time_total = measure(f, iters)
        -- To improve precision, we want to loop for this long
        local target_time = 1
        while time_total < target_time and BENCHMARK_EXACT do
            iters = math.ceil(target_time / time_per_iter)
            time_per_iter, time_total = measure(f, iters)
        end
        print(string.format("%20s: %-10.6g sec/iter (%3d iters, %.4g sec for benchmark)",
                            msg, time_per_iter, iters, timer_benchmark:elapsed()))
    end
end

local function do_pending_repaint()
    require("gears.timer").run_delayed_calls_now()
end

local function create_and_draw_wibox()
    create_wibox()
    do_pending_repaint()
end

local _, textclock = create_wibox()

local function relayout_textclock()
    textclock:emit_signal("widget::layout_changed")
    do_pending_repaint()
end

local function redraw_textclock()
    textclock:emit_signal("widget::redraw_needed")
    do_pending_repaint()
end

local function update_textclock()
    textclock:emit_signal("widget::updated")
    do_pending_repaint()
end

local function e2e_tag_switch()
    awful.tag.viewnext()
    do_pending_repaint()
end

benchmark(create_and_draw_wibox, "create&draw wibox")
benchmark(update_textclock, "update textclock")
benchmark(relayout_textclock, "relayout textclock")
benchmark(redraw_textclock, "redraw textclock")
benchmark(e2e_tag_switch, "tag switch")

runner.run_steps({ function() return true end })

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