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    rrraptorrrraptor Member
    edited April 2021 in General questions
    I was wondering how to multithread things :smile:
    For example, we have 8 grids where each grid have an array of 32*32 elemnts (in total 8192 iterations). Lets say that this grids do not share any information, so they selfcontained objects. I need to update each grid every frame and loop over every (or maybe not) element and do something with it.
    I came up with this:
    https://github.com/MultiPain/Gideros_examples/tree/master/Multithreading

    So, the question: is it correct? Or there is a nicer way?)

    For me it seems correct.
    16 improvised grids of [64x64] size: 65536 iterations per frame
    No threads: ~0.025 seconds full cycle (40 fps)
    Threads: ~0.0045 seconds full cycle (60 fps)

    32 "grid" [128x128]: 524288 iterations
    No threads: ~0.18 seconds full cycle (5 fps)
    Threads: ~0.016 seconds full cycle (60 fps)

    Specs: i7-2600k 3.4GHz (8 logical cores, 8 threads)

    Likes: MoKaLux

    SuperShape | Nice blured shapes with shadows | Simple button pad | Simple layer class | Simple UI library | 2D camera lib | Color picker | FPS graph | Dear ImGui | cute_c2
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    Comments

    • rrraptorrrraptor Member
      edited April 2021
      However, there is a big problem. In player mode, thread worker works ok, but only at the very first start. The next one causes the player to freeze and crash.
      SuperShape | Nice blured shapes with shadows | Simple button pad | Simple layer class | Simple UI library | 2D camera lib | Color picker | FPS graph | Dear ImGui | cute_c2
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    • rrraptorrrraptor Member
      edited April 2021
      Also, threads working only with COPY of your data that can be serialised, so there is no way to use them with any type of graphics. @hgy29 is that correct? And inside a thread you do not have access to any plugin except for these: socket.core, lfs, json, json.safe, mime.core.
      So...thread can only do some basic operations.
      SuperShape | Nice blured shapes with shadows | Simple button pad | Simple layer class | Simple UI library | 2D camera lib | Color picker | FPS graph | Dear ImGui | cute_c2
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    • MoKaLuxMoKaLux Member
      edited April 2021
      I tested your code but it crashes the player even on the first launch.
      if (USE_THREADS) then 
	local CORES = Thread.getNumLogicalCores()
	print(CORES)
	-- use all logical cores
	worker = Worker.new(CORES)
end
      But when you don't use all available CORES that doesn't crash the player anymore :)
      	worker = Worker.new(CORES/2) -- CORES-2 perhaps works too?
      my growING GIDEROS github repositories: https://github.com/mokalux?tab=repositories
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    • rrraptorrrraptor Member
      MoKaLux said:

      I tested your code but it crashes the player even on the first launch.

      if (USE_THREADS) then 
	local CORES = Thread.getNumLogicalCores()
	print(CORES)
	-- use all logical cores
	worker = Worker.new(CORES)
end
      But when you don't use all available CORES that doesn't crash the player anymore :)
      	worker = Worker.new(CORES/2) -- CORES-2 perhaps works too?
      Yeah, its not stable. Maybe depends on processor...?
      i7-2600k 8 cores - OK
      i7-8600 12 cores - OK
      SuperShape | Nice blured shapes with shadows | Simple button pad | Simple layer class | Simple UI library | 2D camera lib | Color picker | FPS graph | Dear ImGui | cute_c2
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    • hgy29hgy29 Maintainer
      rrraptor said:

      Also, threads working only with COPY of your data that can be serialised, so there is no way to use them with any type of graphics. @hgy29 is that correct? And inside a thread you do not have access to any plugin except for these: socket.core, lfs, json, json.safe, mime.core.
      So...thread can only do some basic operations.

      Yes, this is correct, mainly due to the fact that Gideros graphic API isn't thread safe.
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