rib/gputop

How do I interpret these metrics?

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The tool supposedly gives an interesting insight into what the GPU is doing when we give it something to do. But how do we interpret it?

What I am observing is that when our webgl app is rendering, gputop shows a small spike in EU Active, but it is well below 100%. Does it mean that we are under utilizing the GPU?

Is there any book or manual? I don't even know what to google. Can anyone give any directions? Thanks