[sldev] 2 core changes?

[Jason Giglio]

Jason Giglio wrote:
> It appears that in recent versions, the SL client is using a lot more 
> CPU on multicore machines.  The effect on performance seems to be 
> strongly positive but it does have some quirks.
> 
> Prior to this, when SL was on a desktop that I wasn't using, its CPU 
> usage was near zero, now it uses about 100% of one CPU all the time, 
> even when it's on a hidden desktop.
> 
> When it is on screen, now it uses nearly 2 full CPUs, and the framerate 
> seems to be very nice, about a 20% increase.
> 
> Can anyone explain the design changes that lead to this new behavior?
> 
> Whatever the "new" loop is doing, can it shut down when the rendering 
> shuts down too, so that SL doesn't burn up electricity when I'm not 
> looking at it?


Sorry to reply to myself, but this only seems to happen "sometimes". 
This is looking more like a bug than a performance enhancement. 
Sometimes the client takes 200% CPU in focus and 100% out of focus, 
sometimes 100% and 0%.

I should note this is the OpenJPEG based client.  Maybe OpenJPEG is 
getting stuck spinning sometimes?

-Jason