Number of concurrent executions

The billing item of concurrency extension is the number of concurrent executions.

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**Table 1** Billing by number of concurrent executions
Billing Item	Description	Resource Extension Type	Billing Formula
Concurrent checks	Total number of concurrent executions for your account's all code check tasks in a region.	Check concurrency extension	Unit price × Concurrency × Purchased duration
Concurrent pipeline executions	Total number of concurrent executions for your account's all pipelines in a region. NOTE: This takes effect only for pipeline tasks. Code check and deployment in these tasks consume the concurrency quota of the corresponding service.	Pipeline concurrency extension
Concurrent deployments	Total number of concurrent executions for your account's all deployment tasks in a region.	Deployment concurrency extension

Scenario Description
Pipelines X and Y are both started for a tenant.
- Pipeline X: consists of check task a and deployment task c.
- Pipeline Y: consists of check tasks a and b, which are executed concurrently.
Calculation Method Analysis
- Code check: Task a is executed in both pipelines, consuming 2 concurrent checks. Task b is also executed, consuming 1 concurrent check. So 3 concurrent checks are used in total.
- Deployment: Deployment task c consumes 1 concurrent deployment.
- Pipeline: Both pipelines are executed, consuming 2 concurrent pipeline executions.