Struct CpuSpan

pub struct CpuSpan { /* private fields */ }

A wrapper around google_cpu_profiler.

Usage:

1. Install gperf_tools (https://github.com/gperftools/gperftools), probably packaged with your Linux distro.
2. Build with cpu_profiler feature.
3. Run the code, the raw output would be in the ./out.profile file.
4. Install pprof for visualization (https://github.com/google/pprof).
5. Bump sampling frequency to once per ms: export CPUPROFILE_FREQUENCY=1000
6. Use something like pprof -svg target/release/rust-analyzer ./out.profile to see the results.

For example, here’s how I run profiling on NixOS:

$ bat -p shell.nix
with import <nixpkgs> {};
mkShell {
  buildInputs = [ gperftools ];
  shellHook = ''
    export LD_LIBRARY_PATH="${gperftools}/lib:"
  '';
}
$ set -x CPUPROFILE_FREQUENCY 1000
$ nix-shell --run 'cargo test --release --package rust-analyzer --lib -- benchmarks::benchmark_integrated_highlighting --exact --nocapture'
$ pprof -svg target/release/deps/rust_analyzer-8739592dc93d63cb crates/rust-analyzer/out.profile > profile.svg

See this diff for how to profile completions:

https://github.com/rust-lang/rust-analyzer/pull/5306

Trait Implementations

impl Debug for CpuSpan

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Drop for CpuSpan

fn drop(&mut self)

Executes the destructor for this type.