AlltoAll

BLE Channel Sounding (Part II)

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BLE Channel Sounding (Part II)

In the previous article, we mentioned that there are mainly two methods for distance measurement in CS: RTT (Round-Trip Time) and PBR (Phase-Based Ranging).Overview of BLE Channel SoundingThis article will briefly analyze distance measurement based on RTT. As shown in the previous figure, the steps for a single RTT measurement are as follows:RTT=2*TOF=(ToAr-ToDi)+(ToAi-ToDr)distance = c … Read more

NCCL Communication C++ Example (Part 4): Implementation and Analysis of AlltoAll_Split

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NCCL Communication C++ Example (Part 4): Implementation and Analysis of AlltoAll_Split

In NCCL cluster communication operations, there is no direct alltoall communication API, nor is there an alltoall_split method. This article mainly introduces the principle of alltoall_split and one implementation method, along with profiling of the send/recv operator calls in the alltoall operation. Other references: NCCL Communication C++ Example (Part 1): Basic Use Case Interpretation and … Read more