Per-Process Energy Estimation

This script estimates per-process CPU energy consumption over a sampling interval using Linux RAPL counters and CPU time attribution, similar to how Scaphandre operates.

---

✅ How It Works

1. Read total CPU energy from (energy_uj)
2. Take a snapshot of per-process CPU times
3. Sleep for a short interval
4. Take another energy + CPU snapshot
5. Attribute total energy to each process based on CPU time share

---

✅ Formula Used

For each process:

[ E_\text{process} = \left( \frac{\Delta T_\text{process}}{\sum \Delta T_\text{all processes}} \right) \times \Delta E_\text{total} ]

Where:

• ( \Delta T_\text{process} ) = Increase in CPU time (user + system) during the interval
• ( \sum \Delta T_\text{all processes} ) = Sum of CPU time increases for all processes
• ( \Delta E_\text{total} ) = Energy difference from RAPL over the interval
• Energy is in microjoules (µJ)

---

✅ Requirements

• Linux machine
• CPU with RAPL support (Intel / some AMD)
• Python 3
• sudo permissions
• psutil installed

Install psutil one of these ways:

Option 1 (system package):

sudo apt install python3-psutil