CODEWITHSUNDEEP
pythonpython-2.7memorypygame
bcdan
bcdan

Reputation: 1428

Python - sudden slowdown in Pygame

I am writing a 3D engine in Python using Pygame. For the first 300 or so frames, it takes from about 0.004 to 0.006 seconds to render 140 polygons. But after that, it suddenly takes an average of about 0.020 seconds to do the same task. This is concerning to me because this is a small-scale test, and even though 50 FPS is decent, it cannot be sustained at 1000 polygons, for instance.

I have already done a lot of streamlining to my code. I have also done some slightly deeper profiling, and it appears that the increased time is more or less proportionately distributed, which suggests that the problem is not specific to a single piece of code.

I assume that the problem has something to do with memory usage, but I do not know exactly why this problem is happening. What specific issue is causing this to happen, and how can I optimize my code to fix it, as well as some more general practices? Since my code is very long, it is posted here.

Upvotes: 3

Views: 206

Answers (1)

MezuCobalt
MezuCobalt

Reputation: 58

Although I can't answer your question exactly, I would use a task manager and watch the "python" (or "pygame" depending on your OS) process, and view it's memory consumption. If that turns out to be the issue, you could check to see what variables you don't need after a certain time, and then you could clear those variables.

Edit: Some CPUs have data loss prevention systems. What I mean by this is this: If Application X takes up 40ish % of the CPU (it doesn't have to be that high). After a certain amount of time, the CPU will throttle the amount of CPU that Application X is allowed to use. This can cause slowdown for things such as this. This doesn't happen with (most) games because they're set up to tell the CPU to expect that amount of strain.

Upvotes: 1

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