What is happening: The demo started with a Twitter graph of just 180 million edges. After that, we started inserting roughly 100,000 edges / second in the graph, while simultaneously computing Pagerank. On the left side, you see the users with highest pageranks. It is updated after each iteration of GraphChi computation.
Execution interval:

Selected Shard

---
---

Updates/sec

Ingests/sec

Delta

Edges

Buffered Edges