GreenScore Methodology and Reference

GreenScore in PGSI is a composite metric that summarizes performance and sustainability signals into one ranking value.

What GreenScore Combines

PGSI computes GreenScore from:

  • energy metrics,

  • carbon footprint metrics,

  • execution time metrics.

The score uses configurable weights:

  • alpha for energy,

  • beta for carbon,

  • gamma for time.

Default CLI values are set to:

  • alpha = 0.4

  • beta = 0.4

  • gamma = 0.2

Why a Composite Score Exists

Single-metric decisions can be misleading. A method can be fast but energy-inefficient, or low-energy but too slow for production use. GreenScore provides a tunable, decision-oriented summary while keeping source metrics visible for transparent interpretation.

Academic Reference

Reference publication:

When documenting or publishing benchmark findings, include:

  1. the GreenScore reference,

  2. your selected weight values,

  3. carbon intensity factor,

  4. hardware/runtime environment details.

Interpretation Guidance

  • Use GreenScore for ranking and coarse prioritization.

  • Use raw energy/time/carbon tables for root-cause analysis and final technical decisions.

  • Re-run critical comparisons with higher run counts to reduce statistical noise.