I Beat Nvidia NCCL by 2.4x(venkat-systems.bearblog.dev)

2 pointsby venkat_2811hace 6 meses2 comments

venkat-systems.bearblog.dev

https://venkat-systems.bearblog.dev/yali-vs-nvidia-nccl/

2 comments

100% OSS, MIT License. YALI - Yet Another Low-Latency Implementation. Achieves 80-85% Speed-of-Light SW efficiency by using ultra low-latency primitives for p2p all_reduce_sum comms collective. Very important operation in multi-gpu llm training and inference

venkat_2811hace 6 meses

Wisdom from CPU land translate well to GPUs. Static Scheduling, Pre-fetching, 3-Stage Double-Buffering, Pre-allocation & memory ordering in custom CUDA kernel helps outperform NVIDIA NCCL. Experimental integration in vllm.rs shows ~20% prefill and ~10% decode latency improvements (TTFT & TPOT)