Diagnostics Dashboard

Dask's dashboard is the first stop when performance surprises appear. It turns distributed execution into visible tasks, memory, transfer, and worker state.

Signals to inspect

• Task stream for idle gaps or straggler tasks.
• Worker memory for spilling or restarts.
• Transfer plots for communication-heavy workflows.
• Scheduler health for very large graphs.

Example workflow

1. Run a representative slice.
2. Save a performance report.
3. Identify whether the bottleneck is CPU, memory, network, or graph overhead.
4. Change one thing and compare.

Operator habit

Do not guess from wall-clock time alone. The dashboard usually tells a clearer story.