Moonshot Open-Sources MoonEP: Expert Parallelism Library for Perfect Load Balancing
SeunghyunSEO7 · x · 2026-07-28
Moonshot AI officially open-sourced MoonEP, an Expert Parallelism (EP) communication library. Its core highlight is achieving perfect load balancing across ranks via dynamic redundant experts, ensuring every rank receives exactly S × K tokens regardless of routing skew.
Technical Details:
- Online Planning: Features a near-optimal GPU planning kernel with negligible overhead.
- Zero Copy & Static Shapes: Fused permute/unpermute operations.
- Underlying Optimization: Adopts Sonic MoE's recomputation and backprop math (contributed by Tri Dao).
Related event: Moonshot Open-Sources MoonEP for MoE Expert Parallelism Communication(6 posts)→
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