Kryo Python SDK
Python helper for Kryo checkpoint signaling. It is optional: other languages send SIGUSR1 / wait for SIGUSR2, or use kryo snapshot create --wait.
kryo.checkpoint() does not snapshot by itself. The Kryo CLI freezes the process after it receives that signal.
Installation
pip install kryo
You still need the Kryo CLI, CRIU, and cuda-checkpoint on Linux. kryo snapshot create and kryo run must be run as root (sudo).
Usage
import kryo
# Setup (runs once, gets checkpointed)
model = load_model()
model.to("cuda")
kryo.checkpoint() # Freeze here
# Inference (runs after restore)
result = model(input)
Then:
sudo kryo snapshot create --name mymodel -- python app.py
sudo kryo run --snapshot mymodel
checkpoint() is idempotent. Recreate the snapshot when the code, model, CUDA toolkit, or NVIDIA driver changes.
Requirements
- Linux (CRIU is Linux-only)
- Kryo CLI on
PATH - NVIDIA driver 550+ for GPU checkpointing
- CRIU and
cuda-checkpoint
1 maintainer
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