Moving perfomance issue's

General TouchDesigner Discussion
1

I have encountered this inexplicable behavior for the second time in a project. This time, the issue arises with a TopToChop node, but I previously experienced the exact same issue with the Blocktracker TOP.

There are two TopToChop nodes in my project, located in different places. Both need to convert a TOP with a resolution of 360x1 pixels, using a 16-bit float RG format. The download type is set to ‘Next Frame (fast).’

When both nodes are cooking, one has a cook time of approximately 9ms, while the other has a cook time of around 0.08ms. However, when I disable the node with the 9ms cook time, the issue shifts to the other node.

How should I interpret this, and how can I solve it?

When i disable them both my total cooktime drops to ~8ms instead of ~25ms so you would think it is not a gpu overload?

See attached screenshots.

Screenshot Single
Screenshot Single1920×1249 228 KB

Screenshot Both
Screenshot Both1920×1249 244 KB

2

This means the GPU is overloaded, so it needs to stall ‘somewhere’. Where it stalls is pretty random, and may even move from those two nodes to other places such as the vsync stall that may occur when rendering a window.