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f0cal / google-coral

Community gathering point for Google Coral dev board and dongle knowledge.
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Do the changes in TPU's frequency (STD, MAX) work in the devboard? what happens to the CPU's frequency during these changes? #87

Open aizzaac opened 4 years ago

aizzaac commented 4 years ago

What I ran

I changed the frequency from STD to MAX. Then I ran inference. I do not see difference when changing frequencies.

What the docs said should happen

I do not fully understand the docs. I am not sure whether the change in frequency works in the devboard or not.

What actually happened

There is not difference in inference speed when changing frequencies.

Namburger commented 4 years ago

The std library should only throttles if the usb tpu reach a certain temperature threshold, under normal conditions, the max should be the same as std. For the pcie devices, the tpu never throttles https://github.com/google-coral/libedgetpu/blob/642a289e4fb3932422b577a1c4c2bfc792ed1d15/tflite/edgetpu_manager_direct.cc#L124

cheers

aizzaac commented 4 years ago

In what category does the devboard fit: USB or PCIE?

Namburger commented 4 years ago

@aizzaac pcie for the dev board, usb is this one https://coral.ai/products/accelerator/