CPU · Central Processing Unit
The host processor in a GPU node: runs the OS, storage and data pipelines, and orchestration while the accelerators do the tensor math; the CPU:GPU ratio is a node-design choice.
Current numbers
~8:1 → ~2:1 and belowGPU:CPU norm rebalancing toward more CPU per node as agentic RL adds rollout/tool/env load
~8:1 → ~2:1 and belowGPU:CPU ratio shifting from training-era norm toward agentic-inference host demand
2:1–1:1agentic-era GPU:CPU ratio, down from the training-era 4:1–8:1 (Intel: 8:1 → 1:1)