CPU usage during GameLoop

[Xmas79]

Wow! I found out that during the "GameLoop" Cpu usage is 100%. There are needs/ways to make this value smalller???

this is the code for gameloop:

While GameRunning
        'DoSomestuffhere
        
        CheckIfIHaveToExitThisLoop   'for stopping gameloop
        DoEvents
    Wend

Thx,
Xmas

[opus]

I don't think that te loop you posted is causing the 100% CPU usage.
The code you show would allows other application to step (DoEvents).
I guess your code for timehandling (if you have something like that) is the problem, are you using the Timer Control?

[Xmas79]

No, I'm not using Timer Control
I just tried to create a new project and put this code in:

Option Explicit
Dim GameRunning As Boolean
Private Sub Form_Load()
    Me.Show
    GameRunning = True
    
    While GameRunning
        DoEvents
    Wend
End Sub
 
'Exit loop when closing form
Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
    GameRunning = False    
End Sub

This code still gets 100% of CPU load.
The program that says 100% of CPU load is the Norton System Doctor. Win98 SE.

The doevents lets my application and VB IDE to step (I think). Other application always will step, even without it.

Thx
Xmas.

[jmiller]

Yes, the CPU usage is 100%. But that doesn't mean that you can't use the CPU anymore. If another program wants time on the cpu, it will get it, because of the doevents statement. However, whenever there is a time where no other program is using the cpu, your program is using it, and therefore it is 100%. I think that you will not acutally notice any speed decrease in other programs while your running your program. Your program uses all the cpu when it can, but it will always yield to others because of the doevents. i don't think its a problem.

[Xmas79]

Yes, in fact I didn't noticed any performance loss...

Thanks a lot,

Xmas.

[Sastraxi]

When you do a loop, it takes all AVAILABLE power. Think of this as being very low-priority; if another application wants the CPU time, VB simply takes less CPU %, and thus more time. This is the same principle why having 2 graphics applications open at one time (say, 3DSMax and Half-Life) will really start to slow down your computer.