mmap each safetensors file, diff block-by-block against live GPU
weights, memcpy only changed blocks. No separate checkpoint files —
the model directory IS the checkpoint. Every 10 min via cron.
Rust tool that mmaps previous checkpoint, diffs against live GPU weights
(via CUDA IPC handles), and only writes changed blocks. For small
behavioral training steps, turns 54GB write into ~500MB.
Also includes vllm_export_hook.py with direct source patch approach —
exports IPC handles from vLLM's worker subprocess after model load.
Run every 10 minutes via cron to protect against vLLM crashes.
Daily rsync to moria for long-term storage.
