Lua cut-scene - coroutine.resume leads to fps drop (or i doing it wrong) -

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i try use coroutines achieve cut scenes using lua, , there no problems except massive fps drop.

i don't know why, coroutine.resume slow down program 5000 fps (without rendering @ all) 300-350 fps while event couroutine not dead (e.g resume constantly). event became dead fps returns normal.

i think couroutines can't slow, , there problems in event.lua/eventmanager.lua code, or measure fps wrong way, or doing horrible.

event.lua

function event()     print("event started")     --simply can     = 1,1000         coroutine.yield()     end     --[[ wait     local wait = 0.0     print("waiting 5 sec")     while wait < 5.0         wait = wait + coroutine.yield()     end     --]]     --[[ play sound     local alarmsound = soundsmanager.getsound("sounds/alarm.ogg")     alarmsound:play()     while alarmsound:isplaying()           coroutine.yield()     end     --]]     print("event ended") end

fps.lua

local fps =  {    fps = 0,    lastfps = 0,    framestime = 0.0 }  function fps.render(framedelta)     fps.fps = fps.fps + 1     fps.framestime = fps.framestime + framedelta     if fps.framestime >= 1.0        if fps.fps ~= fps.lastfps           print("[fps] ".. fps.fps)           fps.lastfps = fps.fps        end        fps.framestime = 0.0        fps.fps = 0     end     end  return fps

eventsmanager.lua

require "event" local eventsmanager = {}  function eventsmanager.init()    eventsmanager.event = coroutine.create(event)  end  function eventsmanager.update(framedelta)     if coroutine.status(eventsmanager.event) ~= 'dead'        coroutine.resume(eventsmanager.event, framedelta)     end end  return eventsmanager

main.lua

eventsmanager = require "eventsmanager" fps = require "fps"  eventsmanager.init()  while true local framedelta = getframedelta() --getting framedelta somehow eventsmanager.update(framedelta)-- comment , fps ok --render scene  fps.render(framedelta) end

i tried code, getframedelta returns time gap between previous , current calls, without scene render. changed wait time 10 seconds. 

local prevtime = os.clock()  local getframedelta = function()     local curtime = os.clock()     local framedelta = curtime - prevtime        prevtime = curtime     return framedelta end

here's output:

d:\dev>lua5.1 luafps.lua
event started waiting .. 10

[fps] 879171 [fps] 882366 [fps] 880471 [fps] 882018 [fps] 880513 [fps] 881368 [fps] 879623 [fps] 881938 [fps] 880498

event ended

[fps] 882053 [fps] 1279909 [fps] 1279631 [fps] 1279899 [fps] 1277089 [fps] 1278399 [fps] 1279005 [fps] 1280125

so, yes co-routines take toll. every time co-routine yields has keep tab of function left off, can resume @ point next time call it. assume accounts discrepancy see : 800kfps v 1200kfps.

that said, don't understand why need co-routines calculating fps. have code calculates fps in fps.render. should suffice call after render scene, doing now, skip event manager part calls co-routine.


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