How to independently measure the performance of the Prefill phase and the Decode phase？

[J1nLo]

As shown in the Figure 1 of the paper, I want to know how to independently measure the performance(rps or latency) of the Prefill phase and the Decode phase？

Now, I have tried these ways:

• Prefill: input_len = x, output_len = 1
• Decode: input_len = 1, output_len = y

Is this method correct? Maybe this method doesn't take into account kvcache, but I don't know how to simulate this part.

And is there any other more precise way?

I would greatly appreciate any guidance on profiling these two phases separately.