cargo-bloat
Find out what takes most of the space in your executable.
Supports ELF (Linux, BSD), Mach-O (macOS) and PE (Windows) binaries.
WASM is not supported. Use twiggy instead.
Inspired by google/bloaty.
Install
cargo install cargo-bloator
cargo install cargo-bloat --no-default-featuresif you don't need regex filtering using the --filter option.
Usage
Get a list of the biggest functions in the release build:
% cargo bloat --release -n 10
Compiling ...
Analyzing target/release/cargo-bloat
File .text Size Crate Name
0.9% 7.1% 27.0KiB cargo_bloat cargo_bloat::main
0.8% 5.7% 21.4KiB cargo_bloat cargo_bloat::process_crate
0.3% 2.3% 8.6KiB [Unknown] read_line_info
0.3% 2.1% 7.9KiB std std::sys::unix::process::process_common::Command::capture_env
0.3% 2.1% 7.8KiB json json::parser::Parser::parse
0.2% 1.7% 6.5KiB [Unknown] elf_add
0.2% 1.7% 6.3KiB std __rdos_backtrace_dwarf_add
0.2% 1.3% 5.0KiB std <rustc_demangle::legacy::Demangle as core::fmt::Display>::fmt
0.2% 1.3% 4.9KiB std std::sys_common::backtrace::_print
0.2% 1.3% 4.8KiB std core::num::flt2dec::strategy::dragon::format_shortest
9.8% 73.5% 278.0KiB And 932 smaller methods. Use -n N to show more.
13.3% 100.0% 378.0KiB .text section size, the file size is 2.8MiB
Get a list of the biggest dependencies in the release build:
% cargo bloat --release --crates
Compiling ...
Analyzing target/release/cargo-bloat
File .text Size Crate
8.1% 61.2% 231.5KiB std
2.5% 19.2% 72.4KiB cargo_bloat
1.2% 9.4% 35.5KiB [Unknown]
1.0% 7.2% 27.2KiB json
0.3% 2.2% 8.5KiB pico_args
0.1% 0.4% 1.7KiB multimap
0.0% 0.3% 1.1KiB memmap
0.0% 0.0% 175B term_size
0.0% 0.0% 45B time
13.3% 100.0% 378.0KiB .text section size, the file size is 2.8MiB
Note: numbers above are a result of guesswork. They are not 100% correct and never will be.
Get a list of the biggest functions in the release build filtered by the regexp:
Note: you have to build cargo-bloat with a regex-filter feature enabled.
% cargo bloat --release --filter '^__' -n 10
Compiling ...
Analyzing target/release/cargo-bloat
File .text Size Crate Name
0.2% 1.7% 6.3KiB std __rdos_backtrace_dwarf_add
0.1% 0.5% 1.9KiB std __rdos_backtrace_qsort
0.0% 0.2% 843B std __udivmodti4
0.0% 0.1% 296B std __floattidf
0.0% 0.1% 290B std __floattisf
0.0% 0.1% 284B std __rdos_backtrace_initialize
0.0% 0.1% 253B std __floatuntisf
0.0% 0.1% 253B std __floatuntidf
0.0% 0.1% 211B std __rdos_backtrace_get_view
0.0% 0.0% 180B std __rdos_backtrace_vector_grow
0.1% 0.7% 2.8KiB And 37 smaller methods. Use -n N to show more.
0.5% 3.6% 13.5KiB filtered data size, the file size is 2.8MiB
Get a list of crates that took longest to compile:
% cargo bloat --time -j 1
Time Crate
1.42s pdb
1.37s regex_syntax
1.11s cargo_bloat
0.96s regex
0.58s binfarce
0.54s json
0.45s libc
0.22s uuid
0.20s fallible_iterator
0.19s pico_args
0.18s scroll
0.12s memmap2
0.09s multimap
0.06s term_size
Flags specific for cargo-bloat:
--crates Per crate bloatedness
--time Per crate build time. Will run `cargo clean` first
--filter <CRATE|REGEXP> Filter functions by crate
--split-std Split the 'std' crate to original crates like core, alloc, etc.
--no-relative-size Hide 'File' and '.text' columns
--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
--message-format <FMT> Output format [default: table] [possible values: table, json]
License
cargo-bloat is licensed under the MIT license.