Energy Consumption

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Energy Consumption is Resource Consumption concerning the amount of energy used by a subject while performing specified activities under specified conditions.

Energy Consumption can apply to:

• A Candidate Solution
• A Distributed System
• A Node
• A Qualified Node
• A Node Set
• A service
• A software component
• A hardware component
• An Execution Facility
• An Operational Resource
• A Test Environment
• A Test Run
• Another subject using energy

Energy Consumption can include energy used by:

• Processors
• Memory
• Storage devices
• Network devices
• Cooling systems
• Power-conversion systems
• Physical Deployment Targets
• Supporting Operational Resources
• Another included facility or component

Energy Consumption can identify:

• The evaluated subject
• The specified activity
• The applicable workload
• The applicable Configuration
• The included components and facilities
• The excluded components and facilities
• The measurement starting event
• The measurement completion event
• The measurement interval
• The applicable energy source
• The measurement method
• The measurement location
• The measurement unit
• The required measurement precision
• The permitted tolerance
• The applicable normalization method
• The applicable DIDO Baseline
• The applicable Validation Criteria
• The applicable Acceptance Criteria
• Its Evidence
• Its Provenance
• Its Traceability

Energy Consumption can be expressed as:

• Total energy used
• Average power over a specified interval
• Maximum power
• Energy used per transaction
• Energy used per request
• Energy used per Test Run
• Energy used per Node
• Energy used per unit of processed data
• Energy used per unit of completed work
• Another value established by the Acceptance Criteria

Resource Consumption concerning the amount of energy used by a subject while performing specified activities under specified conditions

Adapted from:

• ISO/IEC 25010:2023, Systems and software Quality Requirements and Evaluation (SQuaRE) — Product quality model
• ISO/IEC 25023:2016, Systems and software Quality Requirements and Evaluation (SQuaRE) — Measurement of system and software product quality
• Resource Consumption
• Performance Efficiency
• DIDO Reference Implementation Conceptual Model
• DIDO-TE draft Requirements Register

This definition specializes Resource Consumption for energy used during DIDO and DIDO-TE operations.

Energy Consumption differs from power:

• Energy Consumption identifies energy used over an interval
• Power identifies the rate at which energy is used at a time or over an interval

Energy Consumption differs from Energy Efficiency:

• Energy Consumption identifies the amount of energy used
• Energy Efficiency relates useful work or another outcome to the energy used

Lower Energy Consumption does not necessarily indicate greater Performance Efficiency when the subject also completes less work or provides lower performance.

Energy Consumption comparisons require equivalent or normalized:

• Workloads
• Completed work
• Test Environments
• Configurations
• Included facilities
• Measurement intervals
• Measurement methods

The applicable Acceptance Criteria should identify whether Energy Consumption includes supporting facilities such as:

• Cooling
• Storage
• Networking
• Power conversion
• Replication
• Backup systems

An Energy Consumption measurement should not combine measured and estimated values without identifying:

• Which values were measured
• Which values were estimated
• The estimation method
• The uncertainty associated with the estimate

DIDO-TE evaluates three Candidate Solutions using the same workload, Test Environment, Configuration, and measurement interval.

For each Candidate Solution, DIDO-TE records:

• Total energy used
• Average power
• Maximum power
• Transactions completed
• Energy used per transaction

The comparative evaluation uses the normalized Energy Consumption measurements to compare the Candidate Solutions.