129 lines
3.8 KiB
Rust
129 lines
3.8 KiB
Rust
//! A collection of tools for profiling rust-analyzer.
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mod stop_watch;
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mod memory_usage;
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#[cfg(feature = "cpu_profiler")]
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mod google_cpu_profiler;
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mod hprof;
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mod tree;
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use std::cell::RefCell;
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pub use crate::{
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hprof::{heartbeat, heartbeat_span, init, init_from, span},
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memory_usage::{Bytes, MemoryUsage},
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stop_watch::{StopWatch, StopWatchSpan},
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};
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pub use countme;
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/// Include `_c: Count<Self>` field in important structs to count them.
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///
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/// To view the counts, run with `RA_COUNT=1`. The overhead of disabled count is
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/// almost zero.
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pub use countme::Count;
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thread_local!(static IN_SCOPE: RefCell<bool> = RefCell::new(false));
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/// Allows to check if the current code is withing some dynamic scope, can be
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/// useful during debugging to figure out why a function is called.
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pub struct Scope {
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prev: bool,
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}
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impl Scope {
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#[must_use]
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pub fn enter() -> Scope {
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let prev = IN_SCOPE.with(|slot| std::mem::replace(&mut *slot.borrow_mut(), true));
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Scope { prev }
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}
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pub fn is_active() -> bool {
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IN_SCOPE.with(|slot| *slot.borrow())
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}
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}
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impl Drop for Scope {
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fn drop(&mut self) {
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IN_SCOPE.with(|slot| *slot.borrow_mut() = self.prev);
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}
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}
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/// A wrapper around google_cpu_profiler.
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///
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/// Usage:
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/// 1. Install gpref_tools (https://github.com/gperftools/gperftools), probably packaged with your Linux distro.
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/// 2. Build with `cpu_profiler` feature.
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/// 3. Run the code, the *raw* output would be in the `./out.profile` file.
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/// 4. Install pprof for visualization (https://github.com/google/pprof).
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/// 5. Bump sampling frequency to once per ms: `export CPUPROFILE_FREQUENCY=1000`
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/// 6. Use something like `pprof -svg target/release/rust-analyzer ./out.profile` to see the results.
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///
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/// For example, here's how I run profiling on NixOS:
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///
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/// ```bash
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/// $ bat -p shell.nix
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/// with import <nixpkgs> {};
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/// mkShell {
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/// buildInputs = [ gperftools ];
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/// shellHook = ''
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/// export LD_LIBRARY_PATH="${gperftools}/lib:"
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/// '';
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/// }
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/// $ set -x CPUPROFILE_FREQUENCY 1000
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/// $ nix-shell --run 'cargo test --release --package rust-analyzer --lib -- benchmarks::benchmark_integrated_highlighting --exact --nocapture'
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/// $ pprof -svg target/release/deps/rust_analyzer-8739592dc93d63cb crates/rust-analyzer/out.profile > profile.svg
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/// ```
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///
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/// See this diff for how to profile completions:
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///
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/// https://github.com/rust-analyzer/rust-analyzer/pull/5306
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#[derive(Debug)]
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pub struct CpuSpan {
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_private: (),
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}
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#[must_use]
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pub fn cpu_span() -> CpuSpan {
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#[cfg(feature = "cpu_profiler")]
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{
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google_cpu_profiler::start("./out.profile".as_ref())
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}
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#[cfg(not(feature = "cpu_profiler"))]
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{
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eprintln!(
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r#"cpu profiling is disabled, uncomment `default = [ "cpu_profiler" ]` in Cargo.toml to enable."#
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)
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}
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CpuSpan { _private: () }
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}
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impl Drop for CpuSpan {
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fn drop(&mut self) {
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#[cfg(feature = "cpu_profiler")]
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{
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google_cpu_profiler::stop();
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let profile_data = std::env::current_dir().unwrap().join("out.profile");
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eprintln!("Profile data saved to:\n\n {}\n", profile_data.display());
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let mut cmd = std::process::Command::new("pprof");
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cmd.arg("-svg").arg(std::env::current_exe().unwrap()).arg(&profile_data);
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let out = cmd.output();
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match out {
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Ok(out) if out.status.success() => {
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let svg = profile_data.with_extension("svg");
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std::fs::write(&svg, &out.stdout).unwrap();
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eprintln!("Profile rendered to:\n\n {}\n", svg.display());
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}
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_ => {
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eprintln!("Failed to run:\n\n {:?}\n", cmd);
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}
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}
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}
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}
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}
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pub fn memory_usage() -> MemoryUsage {
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MemoryUsage::now()
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}
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