Organize Rust projects for faster compilation with Cargo workspaces

"Simple projects in the Rust language are typically made up of a single crate. But the cargo project management utility for Rust lets you split a project into workspaces, which are smaller packages within the main package. Splitting an existing project into workspaces-essentially subprojects-takes some planning, as you'll need to figure out what duties will be handled by the code in each workspace."

"In that directory, create a new Cargo.lock file which contains just the following: [workspace] resolver = "3" This tells cargo the top-level directory is a workspace, and not a standalone crate. The " resolver " in that file refers to the version number for Cargo's resolver algorithm, which determines how to perform dependency resolution between Rust crates. The most recent version of the algorithm is 3, so any new projects started in the most recent edition of Rust should use that."

Cargo workspaces allow a Rust project to be divided into multiple crates under a single top-level directory, enabling logical separation of duties and smaller rebuild scopes. Setting up a workspace requires creating a top-level Cargo.lock with [workspace] resolver = "3" so Cargo treats the directory as a workspace. Developers should plan which responsibilities each workspace will handle before splitting an existing crate. After declaring the workspace, create individual crates with cargo new inside the workspace directory and manage dependencies through each crate's Cargo.toml. Workspaces consolidate dependency resolution and can speed up compilation. Legacy projects should preserve existing resolver values when migrating.

Read at InfoWorld