Hi everybody,
out of curiosity I monitored the memory usage of my game engine and noticed that it's memory usage rises at a rate of about 4k/second (task manager, Windows 7 x64). So far the program only consists of an entity/component system and a simple game class for testing. Essentially my game loop looks like this:
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| void gameLoop() {
if (scene == null) throw new RuntimeException("Critical: Game.scene must not be null.");
millisPassed = System.currentTimeMillis();
while (!gameEnd) {
fdelta = (System.currentTimeMillis() - millisPassed) / 1000f;
scene.update(fdelta);
scene.render(fdelta);
millisPassed = System.currentTimeMillis();
calculateFps();
yield();
}
} |
I already found out that when commenting the scene.update and scene.render method calls out the memory usage is constant, but the only thing I do in those methods is iterating over an empty ArrayList<Entity>:
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| public class Scene implements IScene {
protected ArrayList<Entity> entities;
public Scene() {
entities = new ArrayList<Entity>();
}
[...]
@Override
public void update(final float fdelta) {
for (Entity entity : entities)
entity.update(fdelta);
}
@Override
public void render(final float fdelta) {
for (Entity entity : entities)
entity.render(fdelta);
}
} |
In their update and render method entities then call the update/render methods of their respective components which do the actual updating/rendering. As already mentioned the program currently iterates over an empty list of entities, so I don't understand why the memory usage increases constantly.
It's not a dramatic increase, from initially 6,000 KB it goes up to 15,000 in about half an hour, but it still concerns me as I assume that it'll be much harder to find the reason for this when my engine is actually doing something.
Here are the Entity's update and render methods:
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| public void render(final float fdelta) {
for (IRenderCallback c : renderers)
c.render(fdelta);
}
public void update(final float fdelta) {
for (IUpdateCallback c : updates)
c.update(fdelta);
} |
I'm new to java and have no clue if this behaviour is normal or what causes it, so I hope you guys can explain it to me.
Thanks in advance!
