Journey to 2-second Inter-node RL Weight Transfer

I just spent the past two weeks getting cross-machine parameter updates for Qwen3-235B (BF16 training, FP8 inference) to run in just 2 seconds (128 GPUs for training, 32 GPUs for inference). Instead of writing a “here’s the solution” kind of post, I want to share my exploration process and thoughts along the way. I’ll post a shorter, polished version on the company blog in a few days.