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--Minetest
--Copyright (C) 2016 T4im
--
--This program is free software; you can redistribute it and/or modify
--it under the terms of the GNU Lesser General Public License as published by
--the Free Software Foundation; either version 2.1 of the License, or
--(at your option) any later version.
--
--This program is distributed in the hope that it will be useful,
--but WITHOUT ANY WARRANTY; without even the implied warranty of
--MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
--GNU Lesser General Public License for more details.
--
--You should have received a copy of the GNU Lesser General Public License along
--with this program; if not, write to the Free Software Foundation, Inc.,
--51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
local setmetatable = setmetatable
local pairs, format = pairs, string.format
local min, max, huge = math.min, math.max, math.huge
local core = core
local profiler = ...
-- Split sampler and profile up, to possibly allow for rotation later.
local sampler = {}
local profile
local stats_total
local logged_time, logged_data
local _stat_mt = {
get_time_avg = function(self)
return self.time_all/self.samples
end,
get_part_avg = function(self)
if not self.part_all then
return 100 -- Extra handling for "total"
end
return self.part_all/self.samples
end,
}
_stat_mt.__index = _stat_mt
function sampler.reset()
-- Accumulated logged time since last sample.
-- This helps determining, the relative time a mod used up.
logged_time = 0
-- The measurements taken through instrumentation since last sample.
logged_data = {}
profile = {
-- Current mod statistics (max/min over the entire mod lifespan)
-- Mod specific instrumentation statistics are nested within.
stats = {},
-- Current stats over all mods.
stats_total = setmetatable({
samples = 0,
time_min = huge,
time_max = 0,
time_all = 0,
part_min = 100,
part_max = 100
}, _stat_mt)
}
stats_total = profile.stats_total
-- Provide access to the most recent profile.
sampler.profile = profile
end
---
-- Log a measurement for the sampler to pick up later.
-- Keep `log` and its often called functions lean.
-- It will directly add to the instrumentation overhead.
--
function sampler.log(modname, instrument_name, time_diff)
if time_diff <= 0 then
if time_diff < 0 then
-- This **might** have happened on a semi-regular basis with huge mods,
-- resulting in negative statistics (perhaps midnight time jumps or ntp corrections?).
core.log("warning", format(
"Time travel of %s::%s by %dµs.",
modname, instrument_name, time_diff
))
end
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