Why does DeepEP LL kernel use double send/recv/signal buffers?

Hi,

I noticed that in the DeepEP LL kernel implementation, there are two sets of send/recv/signal buffers being maintained. However, it seems that during each dispatch/combine communication,the current buffer is used, while the next buffer is cleared. From my observation, both buffers are not used simultaneously.

Is there a specific reason for using double buffers here? Would creating a single buffer suffice, considering they are not active at the same time?

Appreciate any insights—thanks for your great work on this project!