22e2f23d5c
Parse less JSON on null builds This commit fixes a performance pathology in Cargo today. Whenever Cargo generates a lock file (which happens on all invocations of `cargo build` for example) Cargo will parse the crates.io index to learn about dependencies. Currently, however, when it parses a crate it parses the JSON blob for every single version of the crate. With a lock file, however, or with incremental builds only one of these lines of JSON is relevant. Measured today Cargo building Cargo parses 3700 JSON dependencies in the registry. This commit implements an optimization that brings down the number of parsed JSON lines in the registry to precisely the right number necessary to build a project. For example Cargo has 150 crates in its lock file, so now it only parses 150 JSON lines (a 20x reduction from 3700). This in turn can greatly improve Cargo's null build time. Cargo building Cargo dropped from 120ms to 60ms on a Linux machine and 400ms to 200ms on a Mac. The commit internally has a lot more details about how this is done but the general idea is to have a cache which is optimized for Cargo to read which is maintained automatically by Cargo. Closes #6866 |
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| .github/ISSUE_TEMPLATE | ||
| src | ||
| tests/testsuite | ||
| .gitignore | ||
| .travis.yml | ||
| appveyor.yml | ||
| ARCHITECTURE.md | ||
| Cargo.toml | ||
| CHANGELOG.md | ||
| CONTRIBUTING.md | ||
| LICENSE-APACHE | ||
| LICENSE-MIT | ||
| LICENSE-THIRD-PARTY | ||
| README.md | ||
Cargo
Cargo downloads your Rust project’s dependencies and compiles your project.
Learn more at https://doc.rust-lang.org/cargo/
Code Status
Code documentation: https://docs.rs/cargo/
Installing Cargo
Cargo is distributed by default with Rust, so if you've got rustc installed
locally you probably also have cargo installed locally.
Compiling from Source
Cargo requires the following tools and packages to build:
gitpythoncurl(on Unix)- OpenSSL headers (only for Unix, this is the
libssl-devpackage on ubuntu) cargoandrustc
First, you'll want to check out this repository
git clone https://github.com/rust-lang/cargo
cd cargo
With cargo already installed, you can simply run:
cargo build --release
Adding new subcommands to Cargo
Cargo is designed to be extensible with new subcommands without having to modify Cargo itself. See the Wiki page for more details and a list of known community-developed subcommands.
Releases
High level release notes are available as part of Rust's release notes. Cargo releases coincide with Rust releases.
Reporting issues
Found a bug? We'd love to know about it!
Please report all issues on the GitHub issue tracker.
Contributing
See CONTRIBUTING.md. You may also find the architecture documentation useful (ARCHITECTURE.md).
License
Cargo is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0).
See LICENSE-APACHE and LICENSE-MIT for details.
Third party software
This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (https://www.openssl.org/).
In binary form, this product includes software that is licensed under the terms of the GNU General Public License, version 2, with a linking exception, which can be obtained from the upstream repository.
See LICENSE-THIRD-PARTY for details.