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05-03-24 09:16 PM |
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| 0 users currently in Computing | 1 guest |
| Main - Computing - Reducing CPU waste? (Programming) | New thread | New reply |
| Smallhacker |
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 Panser Swedish weirdo times eleven Level: 42 Posts: 122/339 EXP: 494768 Next: 26594 Since: 02-19-07 From: Stockholm, Sweden Last post: 5192 days Last view: 5191 days |
A C++ program I'm working on (that uses SDL) uses up a lot of CPU power, more than it should. It seems like the program runs it's "update" code multiple times per frame, which is completely unneccesary.
I've tried to place a SDL_Delay(blah) between each update, but it either slows the program down too much or has no effect. Another programming language I've worked with came with a function that paused the program until the current frame had been drawn to the screen, but I've been unable to find such a function in SDL or any other C++ library. Any suggestions? ____________________   |
| neotransotaku |
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 Shyguy Level: 24 Posts: 16/95 EXP: 73055 Next: 5070 Since: 04-19-07 Last post: 5029 days Last view: 2912 days |
Perhaps you need to try to use threads explicitly? Because if the condition to update is the drawing of a new frame, then that should be a relatively easy thing to control.
I know UNIX comes with a nice thread library. I know windows should have something. If you are unsure how to use threads, I can lend some help. |
| HyperHacker |
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... Level: 73 Posts: 853/1220 EXP: 3368789 Next: 117079 Since: 03-25-07 From: no Last post: 6099 days Last view: 6082 days |
I don't think SDL is thread-safe. A delay after each frame should do the trick if you use the right value. 13ms should cap it to ~60FPS, assuming it's getting that much to begin with.
Generally, though, you want to keep the frame rate as high as possible and make all logic/timing independent of it. Otherwise everything will run really fast on faster machines, and lag on slower ones, like so (fast, medium, slow): Whereas with a fixed timestep they'd all move the same speed, but on slower machines you'd see choppiness (which I can't seem to duplicate with marquees). |
| setz |
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 Spike fuck~ Level: 58 Posts: 441/722 EXP: 1537810 Next: 39736 Since: 02-19-07 From: Pittsburgh, PA Last post: 5297 days Last view: 2585 days |
I'd say that reads fairly well on lower (1024x768 atm) resolutions, HH. ____________________ |
| HyperHacker |
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... Level: 73 Posts: 855/1220 EXP: 3368789 Next: 117079 Since: 03-25-07 From: no Last post: 6099 days Last view: 6082 days |
Posted by setzAnd what would "that" be? |
| Main - Computing - Reducing CPU waste? (Programming) | New thread | New reply |
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