Software
DeepEP
In plain English
DeepSeek’s expert-parallel communication library family for routing tokens to experts and combining their outputs.
Technical definition
DeepEP implements communication paths for mixture-of-experts dispatch and combine, with backend-specific support for hardware and transport mechanisms.
Engineering details
Dispatch sends token data to the devices hosting selected experts; combine returns and aggregates their outputs. Message distribution depends on routing, batch size, expert placement, and topology. Communication may overlap other work, but it can also consume resources needed by compute kernels.
Why it matters
A fast communication microbenchmark does not guarantee a proportional model speedup. Routing imbalance, dependencies, and resource contention determine how much communication remains on the critical path.
How to read it in InferenceX
The Huawei port compares dispatch/combine measurements and discusses Ascend communication overlap. Keep the reported hardware and configuration attached to those results, and distinguish the Ascend implementation from other DeepEP backends.