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    how memory is released

    flashjaysanflashjaysan Member
    in General questions
    I'm currently working on a snake clone and I create body parts each time it eats food. So, I create a new Bitmap for each new body part. However, when I lose, I need to erase every parts I created except the head and tail of the snake.
    I use stage:removeChildAt method to remove everything from the scene. Does it frees memory of those objects or do I have to do something special with them ?
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    Comments

    • keszeghkeszegh Member
      be careful that there is no reference left for that bitmap and then it will be garbage collected later. not necessary to do anything. if there is enough time between restarting then you can call garbagecollect() once or twice and then you can force this to happen at that time.

      Longtitle Productions, creator of
      Fragmenter - animated loop machine and IKONOMIKON - the memory game
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    • keszeghkeszegh Member
      still, i think in such cases some pooling method is recommended where you put these elements in a table and then you can reuse them later.
      Longtitle Productions, creator of
      Fragmenter - animated loop machine and IKONOMIKON - the memory game
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    • flashjaysanflashjaysan Member
      @keszegh Thanks. So in order to completely remove, I should nil every variable that references those Bitmap?
      I'll take your pooling method in consideration. Thanks again.
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    • keszeghkeszegh Member
      yes, you need to nil every reference and of course remove it from stage hierarchy.
      Longtitle Productions, creator of
      Fragmenter - animated loop machine and IKONOMIKON - the memory game
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    • olegoleg Member
      edited July 2018 
      local UsedMemory = function(cleanup)
        if cleanup == true then
                collectgarbage()
        end
        local mem = collectgarbage("count")
        print( "\n Memory : " .. mem*1024 )
        return mem
end
-------------------------------------  
UsedMemory(true)  --run after object deletion

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    • antixantix Member
      edited July 2018 
      -- create the snakes head
local head = Sprite.new()
 
-- add 20 tail sections to the snake
for i = 1, 20 do
  head:addChild(Sprite.new())
end
 
-- remove all tail sections from head
if head:getNumChildren() > 0 then -- only proceed if there is at least 1 tail section
  for i = 1, head:getNumChildren() do
    head:removeChildAt(1) -- remove tail ection
  end
end
 
-- you should remove any other references to the tail sections here.
 
-- you can opt to force garbage colection after the tail sections
-- have been removed, or leave it to happen automatically
collectgarbage('collect')

      Likes: Apollo14

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