Energy Consumption [Dido Solutions, Inc Wiki]

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====== Energy Consumption ======

[[dido:99_annexes:annex-b-terms-and-definitions:start|Go up to Terms and Definitions]]

===== Discussion =====

Energy Consumption is [[dido:99_annexes:annex-b-terms-and-definitions:r:resource_consumption|Resource Consumption]] concerning the amount of energy used by a subject while performing specified activities under specified conditions.

Energy Consumption can apply to:

  * A [[dido:99_annexes:annex-b-terms-and-definitions:c:candidate_solution|Candidate Solution]]
  * A [[dido:99_annexes:annex-b-terms-and-definitions:d:distributed_system|Distributed System]]
  * A [[dido:99_annexes:annex-b-terms-and-definitions:n:node|Node]]
  * A Qualified Node
  * A [[dido:99_annexes:annex-b-terms-and-definitions:n:node_set|Node Set]]
  * A service
  * A software component
  * A hardware component
  * An [[dido:99_annexes:annex-b-terms-and-definitions:e:execution_facility|Execution Facility]]
  * An [[dido:99_annexes:annex-b-terms-and-definitions:o:operational_resource|Operational Resource]]
  * A [[dido:99_annexes:annex-b-terms-and-definitions:t:test_environment|Test Environment]]
  * A [[dido:99_annexes:annex-b-terms-and-definitions:t:test_run|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 [[dido:99_annexes:annex-b-terms-and-definitions:c:configuration|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 [[dido:99_annexes:annex-b-terms-and-definitions:b:baseline|Baseline]]
  * The applicable [[dido:99_annexes:annex-b-terms-and-definitions:v:validation_criteria|Validation Criteria]]
  * The applicable [[dido:99_annexes:annex-b-terms-and-definitions:a:acceptance_criteria|Acceptance Criteria]]
  * Its [[dido:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]]
  * Its [[dido:99_annexes:annex-b-terms-and-definitions:p:provenance|Provenance]]
  * Its [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|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

===== Definition =====

//[[dido:99_annexes:annex-b-terms-and-definitions:r:resource_consumption|Resource Consumption]] concerning the amount of energy used by a subject while performing specified activities under specified conditions//

===== Source =====

Adapted from:

  * [[https://www.iso.org/standard/78176.html|ISO/IEC 25010:2023, Systems and software Quality Requirements and Evaluation (SQuaRE) — Product quality model]]
  * [[https://www.iso.org/standard/35747.html|ISO/IEC 25023:2016, Systems and software Quality Requirements and Evaluation (SQuaRE) — Measurement of system and software product quality]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:r:resource_consumption|Resource Consumption]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:p:performance_efficiency|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.

===== Note =====

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 [[dido:99_annexes:annex-b-terms-and-definitions:p:performance_efficiency|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

===== Example =====

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.

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