Function runtime selection-阿里云帮助中心

To meet the requirements of different scenarios, Function Compute provides built-in runtimes, custom runtimes, and Custom Container runtimes. This topic describes the applicable scenarios and differences of the function runtimes that Function Compute supports to help you make a technical selection.

Comparison

Feature	Built-in runtime	Custom runtime	Custom Container runtime
Use cases	Write code to process an event and an HTTP request using the interfaces defined by Function Compute.	Build applications with popular frameworks such as Java SpringBoot, Node.js Express, Python Flask, and Golang Gin, or migrate existing ones.	Gain full control over your application's environment or migrate existing containerized applications. Use a gpu-accelerated instance.
Cold start	Fastest. The code package does not include the runtime, which enables the fastest cold start.	Faster. A custom runtime uses a public base image, which eliminates image pull time, enabling a faster cold start.	Slower. The runtime must pull the container image, which causes a slower cold start.
Code package limit	500 MB for an uncompressed code package	500 MB for an uncompressed code package	10 GB for an uncompressed image
Code package format	ZIP, JAR (Java), or a folder	ZIP, JAR (Java), or a folder	See Alibaba Cloud Container Registry (ACR)
Gpu-accelerated instance support	Not supported	Not supported	Supported
Runtimes	Node.js, Python, PHP, Java, .NET Core, and Go	Unlimited	Unlimited

Function runtimes

Built-in runtime

Choose a built-in runtime if you want to write code that processes an event and an HTTP request using the interfaces defined by Function Compute. For more information, see Create a function.

The Create Function page offers three options: Use Built-in Runtime, Use Custom Runtime, and Use Container Image.

Custom runtime

Choose a custom runtime to build applications with popular frameworks such as Java SpringBoot, Node.js Express, Python Flask, or Golang Gin, or to migrate existing ones. For more information, see Create a function.

In the Runtime drop-down list, available custom runtimes include .NET 6.0, TypeScript, Rust, Ruby, Dart, and Deno.

Custom Container runtime

Alibaba Cloud Container Registry (ACR) is a platform for the secure hosting and efficient distribution of cloud-native artifacts that comply with the OCI standard, such as container images and Helm Charts. When you deploy functions by using container images, you can use a secure and efficient cloud-based image hosting and distribution service without having to build and maintain your own. For more information, see Create a Custom Container function.

On the Create Function page, select Use Container Image. Then, expand and configure the Basic Settings, Image Settings, Advanced Settings, Environment Variables, and Trigger Settings sections as needed. Finally, click Create.