Idle mode-Serverless App Engine(SAE)-阿里云帮助中心

Idle mode lowers your costs by billing idle application instances at a reduced rate compared to active instances.

Important

This feature is in invitational preview. To use this feature, contact our technical support in the DingTalk group (group ID: 32874633) for access.
Idle mode is available only for the standard and professional editions of SAE applications.

Billing

After you enable idle mode, the vCPUs of an application instance in an idle status use a lower CU conversion coefficient than active vCPUs, as shown in the following table.

Application edition	Billable item	CU coefficient (default)	CU coefficient (Hygon)	Unit
standard edition	active vCPU usage	1	1.274	CU per vCPU-second
standard edition	idle vCPU usage	0.2	0.2548	CU per vCPU-second
professional edition	active vCPU usage	1.1	1.4014	CU per vCPU-second
professional edition	idle vCPU usage	0.22	0.28028	CU per vCPU-second

Enable idle mode

In the SAE application list, select the target region and namespace at the top of the page, and then click the target application ID to open the application details page.
On the Basic Information page, click the Auto Scaling tab. In the Idle Mode section, turn on the switch.

Important
Enabling idle mode triggers adjustments to application instances, which can cause temporary service interruptions. Before you proceed, configure graceful start and shutdown to prevent service disruptions.

Idle status conditions

The instance vCPU specification must be vCPU specification for a single instance <= 8 cores. No memory specification requirement applies.
- For a single instance with a vCPU specification of <= 2 cores, the actual vCPU usage must be an actual vCPU usage of < 0.03 cores.
- For instances where 2 cores < Instance vCPU specification <= 8 cores, the actual vCPU usage must be Actual instance vCPU usage < Instance vCPU specification * 1%. For example, if Instance vCPU specification = 4 cores, the instance is considered idle when Actual instance vCPU usage < 0.04 cores.
Inbound network traffic must be Inbound network traffic for a single instance < 20,000 bytes/second. No outbound traffic requirement applies.
Idle duration must not exceed Idle duration of a single instance <= Total runtime * 50%. Any duration beyond this limit is billed at the active rate.

Idle status verification

After you enable idle mode, view resource usage metrics by the applications, or Instance dimension to check whether the idle conditions are met. You can select a predefined or custom time range.

applications, : displays the number of application instances and the idle time percentage in total CPU resource usage (core-hours).
Instance: displays the idle status, idle time percentage in CPU resource usage (core-hours), CPU usage in cores, and inbound traffic in bytes per second (B/s).

Disable idle mode

In the SAE application list, select the target region and namespace at the top of the page, and then click the target application ID to open the application details page.
On the Basic Information page, click the Auto Scaling tab. In the Idle Mode section, turn off the switch.

Important
After you disable idle mode, all application instances are billed at the active rate.