To meet your business requirements in different scenarios, Function Compute provides built-in runtimes, custom runtimes, and Custom Container runtimes. This topic describes the applicable scenarios of and differences between the runtimes that are supported by Function Compute to help you select a runtime that best meet your business requirements.
Comparison
Item | Built-in runtimes | Custom runtimes | Custom Container runtimes |
Scenarios | Write programs to handle events and HTTP requests based on the interfaces defined by Function Compute. | Write programs based on popular frameworks, such as Java SpringBoot, Node.js Express, Python Flask, and Golang Gin, or migrate existing framework applications. |
|
Cold start duration | Shortest The durations of cold starts are shortest because runtimes are not included in code packages. | Short Custom runtimes use common images and no need to pull images. Therefore, the durations of cold starts are short. | Relatively long The durations of cold starts are long because images must be pulled. |
Upper limit of code package size | 500 MB uncompressed code package. | 500 MB uncompressed code package. | 10 GB uncompressed image. |
Code package formats | ZIP, JAR (Java), and folder. | ZIP, JAR (Java), and folder. | |
GPU-accelerated instances | Not Supported. | Not Supported. | Supported. |
Runtimes | Node.js, Python, PHP, Java, .NET Core, and Go. | Unlimited. | Unlimited. |
Function runtimes
Built-in runtimes
If you want to use the interfaces defined by Function Compute to write programs for handling event requests and HTTP requests, use a built-in runtime. For more information, see the Create a function section in Manage functions.
Custom runtimes
If you want to write programs based on a popular framework, such as Java SpringBoot, Node.js Express, Python Flask, and Golang Gin, or migrate existing framework applications, you can use a custom runtime. For more information, see the Create a function section in Manage functions.
Custom Container runtimes
Alibaba Cloud Container Registry is a secure platform that allows you to manage and distribute cloud-native artifacts that meet the standards of Open Container Initiative (OCI) in an efficient manner. The artifacts include container images and Helm charts. If you use a container image to deploy a function, you can enjoy secure and efficient image hosting and distribution on the cloud without the need to create and maintain a self-managed image service. For more information, see Create a custom container function.
