cargo-bloat 0.2.1

cargo-bloat

Find out what takes most of the space in your executable.

Inspired by google/bloaty.

Note: Linux and macOS only.

Install

cargo install cargo-bloat

Usage

Get a list of biggest functions in the release build:

% cargo bloat --release -n 10
    Finished release [optimized] target(s) in 0.2 secs

 File  .text    Size Name
38.2%  93.3%  4.1MiB [8805 Others]
 0.5%   1.3% 57.6KiB <regex::exec::ExecNoSync<'c> as regex::re_trait::RegularExpression>::read_captures_at
 0.3%   0.8% 36.3KiB regex_syntax::parser::Parser::parse_expr
 0.3%   0.7% 30.1KiB <cargo::core::resolver::encode::_IMPL_DESERIALIZE_FOR_EncodableResolve::<impl serde::de::D...
 0.3%   0.6% 29.1KiB <cargo::util::toml::_IMPL_DESERIALIZE_FOR_TomlManifest::<impl serde::de::Deserialize<'de> ...
 0.3%   0.6% 28.5KiB cargo::call_main_without_stdin
 0.2%   0.6% 27.2KiB cargo::util::toml::do_read_manifest
 0.2%   0.5% 24.0KiB globset::GlobSet::new
 0.2%   0.5% 23.7KiB cargo::core::resolver::encode::EncodableResolve::into_resolve
 0.2%   0.5% 23.6KiB cargo::ops::cargo_rustc::compile_targets
 0.2%   0.5% 23.0KiB <cargo::util::toml::_IMPL_DESERIALIZE_FOR_TomlProject::<impl serde::de::Deserialize<'de> f...
40.9% 100.0%  4.4MiB .text section size, the file size is 10.8MiB

Get a list of biggest dependencies in the release build:

% cargo bloat --release --crates -n 10
    Finished release [optimized] target(s) in 0.2 secs

 File  .text     Size Name
11.3%  27.6%   1.2MiB cargo
10.2%  24.9%   1.1MiB std
 3.0%   7.2% 325.2KiB [Unknown]
 2.7%   6.5% 293.2KiB libgit2_sys
 2.2%   5.3% 240.5KiB toml
 2.0%   5.0% 224.7KiB goblin
 1.9%   4.7% 210.4KiB regex
 1.1%   2.8% 124.7KiB serde_ignored
 1.0%   2.5% 110.8KiB regex_syntax
 0.9%   2.1%  95.2KiB serde_json
40.9% 100.0%   4.4MiB .text section size, the file size is 10.8MiB

Flags specific for cargo-bloat:

--crates                Per crate bloatedness
--filter CRATE          Filter functions by crate
--split-std             Split the 'std' crate to original crates like core, alloc, etc.
--print-unknown         Print methods under the '[Unknown]' tag
--full-fn               Print full function name with hash values
-n NUM                  Number of lines to show, 0 to show all [default: 20]
-w, --wide              Do not trim long function names

Correctness

The results are not perfect since function names parsing is not perfect. Also, all non-Rust methods are skipped during crates resolving which moves jemalloc and any other C libraries to the [Unknown] section.

License

cargo-bloat is licensed under the MIT.