How to read Game/Render thread performance?

Development Rendering
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1

I’m working on performance analysis on Android phone, there’s something I can’t quite understand.

According to data I got from “stat startfile/stopfile”, my games performance was like this.

"GameThread [0x746f]","62.596 ms","100.0 %","0.000 ms","0.0 %","1.0",
	"FrameTime","62.550 ms","99.9 %","0.000 ms","0.0 %","2.0",
		"Total Slate Tick Time","32.848 ms","52.5 %","0.000 ms","0.0 %","1.0",
		"GameEngine Tick","20.715 ms","33.1 %","0.000 ms","0.0 %","1.0",
		"Frame Sync Time","8.668 ms","13.9 %","0.000 ms","0.0 %","1.0",

"RenderThread [0x7489]","40.003 ms","63.9 %","0.000 ms","0.0 %","1.0",

As you can see, GameThead took far longer time than RenderThread. When I saw this at first I thought this was typical GameThread bottleneck case.

But there’s “Frame Sync Time” which took 8.6 ms!!

What should I make of this? Is this GameThread bottleneck or RenderThread bottleneck?

2

I wonder what ‘Frame Sync Time’ is too… would that have anything to do with Vsync ?