Just an innocent question, don't throw any rocks... Do you guys think that Java would need an optimized JVM for games, at least the more CPU-intensive ones, or the existing one does fine? I'm not talking about changing the language, but changing the JVM specification, maybe by allowing control of the garbage collector, among other stuff. Is it possible? Reasonable? Making sense? Or it's just a stupid idea?
the current one does perfectly fine.
There is no need to control the GC as it already optimised (and can be further optimised by supplying the correct command line flags) to garbage collect when there is minimal load. Also, coding correctly in the first place would stop the GC kicking in the first place. I.e. only creating new objects in constructors and in the start of the game and not in the middle. Also re-use variables, i.e. if your planning on doing this every frame:
Vector3f f = sprite2.getLocalTranslation();
f.x += 2;
sprite2.setLocalTranslation(f);
It would be better to either make that final or have a pre-made final vector:
private static final Vector3f tempVa = new Vector3f();
public void someMethod() {
tempVa = sprite2.getLocalTranslation();
tempVa.x+= 2;
sprite2.setLocalTranslation(tempVa);
}
That would basically stop the GC dead in its tracks. Also, that method can probably be inlined later if called enough times, so you can have ASM speed!
DP
Well right now it doesn't compile, but I assume you meant to do:
private static final Vector3f tempVa = new Vector3f();
public void someMethod() {
tempVa.set(sprite2.getLocalTranslation());
tempVa.x+= 2;
sprite2.setLocalTranslation(tempVa);
}
This would require getLocalTranslation() to return its internal Vector3f, rather than a copy.
or....
private static final Vector3f tempVa = new Vector3f();
public void someMethod() {
tempVa = sprite2.getLocalTranslation(tempVa);
tempVa.x+= 2;
sprite2.setLocalTranslation(tempVa);
}
// and within sprite
public Vector3f getLocalTranslation(Vector3f dst)
{
if(dst==null) dst = new Vector3f();
localTrans.copyInto(dst);
return dst;
}
and perhaps even better ...
public Vector3f getLocalTranslation(Vector3f dst)
{
if(dst==null) dst = new Vector3f();
dst.set(localTrans);
return dst;
}
