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Cloud instances

Characteristics

Cloud instance characteristics are pre-recorded as archetypes. The API will complete the following characteristics depending on the cloud provider and cloud instance name given by the user :

Name Unit Description Example
vcpu None Number of virtual CPUs 2
memory GB RAM capacity 32
ssd_storage GB SSD storage capacity 500
hdd_storage GB HDD storage capacity 0
platform None Bare metal hosting the instance a1.metal
usage None See usage

To add a new cloud instance to the API please refer to the cloud instance contribution guide.

Cloud instance usage

In addition to the characteristics available for usage, you can use the following:

Name Unit Default value (default;min;max) Description Example
other_consumption_ratio None 0.33;0.2;0.6 Power consumption ratio of other components relative to RAM and CPU 0.2

Embedded impacts

Impacts criteria

Criteria Implemented Source
gwp yes Bottom-up approach based on Green Cloud Computing, 2021
adp yes Bottom-up approach based on Green Cloud Computing, 2021
pe yes Bottom-up approach based on Green Cloud Computing, 2021
gwppb yes Base IMPACTS® ADEME
gwppf yes Base IMPACTS® ADEME
gwpplu yes Base IMPACTS® ADEME
ir yes Base IMPACTS® ADEME
lu yes Base IMPACTS® ADEME
odp yes Base IMPACTS® ADEME
pm yes Base IMPACTS® ADEME
pocp yes Base IMPACTS® ADEME
wu yes Base IMPACTS® ADEME
mips yes Base IMPACTS® ADEME
adpe yes Base IMPACTS® ADEME
adpf yes Base IMPACTS® ADEME
ap yes Base IMPACTS® ADEME
ctue yes Base IMPACTS® ADEME
ctuh_c yes Base IMPACTS® ADEME
ctuh_nc yes Base IMPACTS® ADEME
epf yes Base IMPACTS® ADEME
epm yes Base IMPACTS® ADEME
ept yes Base IMPACTS® ADEME

Method

Embedded impacts of cloud instances are assessed based on the physical characteristics of the bare metal server hosting the instance (also named platform in this documentation). The API allocate a portion of the impacts of each component to the instance based on the ratio of the instance characteristics to the server characteristics :

  • For RAM : \(\text{RAM}_{\text{instance}}^{\text{embedded}} = \text{RAM}_{\text{server}}^{\text{embedded}} \times \frac{\text{memory}_{\text{instance}}}{\text{RAM}_{\text{server}}}\)
  • For SSD storage : \(\text{SSD}_{\text{instance}}^{\text{embedded}} = \text{SSD}_{\text{server}}^{\text{embedded}} \times \frac{\text{ssd_storage}_{\text{instance}}}{\text{ssd_storage}_{\text{server}}}\)
  • For HDD storage : \(\text{HDD}_{\text{instance}}^{\text{embedded}} = \text{HDD}_{\text{server}}^{\text{embedded}} \times \frac{\text{hdd_storage}_{\text{instance}}}{\text{hdd_storage}_{\text{server}}}\)
  • For CPU and all other components : \(\text{Component}_{\text{instance}}^{\text{embedded}} = \text{Component}_{\text{server}}^{\text{embedded}} \times \frac{\text{vCPU}_{\text{instance}}}{\text{vCPU}_{\text{server}}}\)

The API will sum the embedded impacts of each component to get the embedded impacts of the instance :

\[ \begin{equation} \begin{aligned} \text{server}_\text{embedded}^\text{criteria} & = \sum_{\set{\text{components}}}{\text{component}_ \text{embedded}^\text{criteria}} \\ \\ & = \text{cpu_units} * \text{CPU}_{embedded}^{criteria} \\ & \quad + \ \text{ram_units} * \text{RAM}_{embedded}^{criteria} \\ & \quad + \ \text{ssd_units} * \text{SSD}_{embedded}^{criteria} \\ & \quad + \ \text{hdd_units} * \text{HDD}_{embedded}^{criteria} \\ & \quad + \ \text{motherboard}_{embedded}^{criteria} \\ & \quad + \ \text{power_supply_units} * \text{power_supply}_{embedded}^{criteria} \\ & \quad + \ \text{assembly}_{embedded}^{criteria} \\ & \quad + \ \text{enclosure}_{embedded}^{criteria} \end{aligned} \end{equation} \]

When component impacts are not available, the API will use the generic impacts of the server and allocate the impacts to the instance based on the ratio of the instance vCPU to the server total vCPU :

\(\text{Instance}_{\text{embedded}} = \text{Server}_{\text{embedded}} \times \frac{\text{vCPU}_{\text{instance}}}{\text{vCPU}_{\text{server}}}\)

Usage impacts

Usage impact of cloud instance are measured only from its consumption profile.

Consumption profile

A cloud instance consumption profile is of the form :

\[ \text{CP}_{\text{component}} = \text{consumption_profile}_{\text{component}} \]
\[ \text{CP}_{\text{instance}}(\text{workload}) = (\text{CP}_{\text{CPU_server}}(\text{workload}) * \frac{\text{vCPU}_{\text{instance}}}{\text{vCPU}_{\text{server}}} + \text{CP}_{\text{RAM_server}}(\text{workload}) * \frac{\text{memory}_{\text{instance}}}{\text{RAM}_{\text{server}}}) * (1 + \text{other_consumption_ratio}) \]

\(\text{CP}_{\text{CPU_server}}(\text{workload})\) and \(\text{CP}_{\text{RAM_server}}(\text{workload})\) depend on the technical characteristics of the RAM and CPU. \(\text{other_consumption_ratio}\) is used to account for the electrical consumption of the other components (other than RAM and CPU).