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Avoid premature pessimization

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The extra allocation for message should not matter here at all, but
using a static string is just as ergonomic, if not more, and there's
no reason to write deliberately slow code
This commit is contained in:
Aleksey Kladov 2020-02-02 18:54:26 +01:00
parent 856e4ba126
commit 24ad1cce2c
3 changed files with 34 additions and 33 deletions
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2
crates/ra_ide/src/change.rs
View file

@ -145,6 +145,8 @@ impl LibraryData {
root_id: SourceRootId, root_id: SourceRootId,
files: Vec<(FileId, RelativePathBuf, Arc<String>)>, files: Vec<(FileId, RelativePathBuf, Arc<String>)>,
) -> LibraryData { ) -> LibraryData {
let _p = profile("LibraryData::prepare");
#[cfg(not(feature = "wasm"))] #[cfg(not(feature = "wasm"))]
let iter = files.par_iter(); let iter = files.par_iter();
#[cfg(feature = "wasm")] #[cfg(feature = "wasm")]

1
crates/ra_lsp_server/src/main_loop.rs
View file

@ -403,7 +403,6 @@ fn loop_turn(
let sender = libdata_sender.clone(); let sender = libdata_sender.clone();
pool.execute(move || { pool.execute(move || {
log::info!("indexing {:?} ... ", root); log::info!("indexing {:?} ... ", root);
let _p = profile(&format!("indexed {:?}", root));
let data = LibraryData::prepare(root, files); let data = LibraryData::prepare(root, files);
sender.send(data).unwrap(); sender.send(data).unwrap();
}); });

64
crates/ra_prof/src/lib.rs
View file

@ -9,7 +9,6 @@ use std::{
collections::BTreeMap, collections::BTreeMap,
collections::HashSet, collections::HashSet,
io::{stderr, Write}, io::{stderr, Write},
mem,
sync::{ sync::{
atomic::{AtomicBool, Ordering}, atomic::{AtomicBool, Ordering},
RwLock, RwLock,
@ -50,6 +49,8 @@ pub fn set_filter(f: Filter) {
*old = filter_data; *old = filter_data;
} }
pub type Label = &'static str;
/// This function starts a profiling scope in the current execution stack with a given description. /// This function starts a profiling scope in the current execution stack with a given description.
/// It returns a Profile structure and measure elapsed time between this method invocation and Profile structure drop. /// It returns a Profile structure and measure elapsed time between this method invocation and Profile structure drop.
/// It supports nested profiling scopes in case when this function invoked multiple times at the execution stack. In this case the profiling information will be nested at the output. /// It supports nested profiling scopes in case when this function invoked multiple times at the execution stack. In this case the profiling information will be nested at the output.
@ -77,10 +78,10 @@ pub fn set_filter(f: Filter) {
/// 0ms - profile /// 0ms - profile
/// 0ms - profile2 /// 0ms - profile2
/// ``` /// ```
pub fn profile(desc: &str) -> Profiler { pub fn profile(label: Label) -> Profiler {
assert!(!desc.is_empty()); assert!(!label.is_empty());
if !PROFILING_ENABLED.load(Ordering::Relaxed) { if !PROFILING_ENABLED.load(Ordering::Relaxed) {
return Profiler { desc: None }; return Profiler { label: None };
} }
PROFILE_STACK.with(|stack| { PROFILE_STACK.with(|stack| {
@ -93,35 +94,35 @@ pub fn profile(desc: &str) -> Profiler {
}; };
} }
if stack.starts.len() > stack.filter_data.depth { if stack.starts.len() > stack.filter_data.depth {
return Profiler { desc: None }; return Profiler { label: None };
} }
let allowed = &stack.filter_data.allowed; let allowed = &stack.filter_data.allowed;
if stack.starts.is_empty() && !allowed.is_empty() && !allowed.contains(desc) { if stack.starts.is_empty() && !allowed.is_empty() && !allowed.contains(label) {
return Profiler { desc: None }; return Profiler { label: None };
} }
stack.starts.push(Instant::now()); stack.starts.push(Instant::now());
Profiler { desc: Some(desc.to_string()) } Profiler { label: Some(label) }
}) })
} }
pub fn print_time(desc: &str) -> impl Drop + '_ { pub fn print_time(label: Label) -> impl Drop {
struct Guard<'a> { struct Guard {
desc: &'a str, label: Label,
start: Instant, start: Instant,
} }
impl Drop for Guard<'_> { impl Drop for Guard {
fn drop(&mut self) { fn drop(&mut self) {
eprintln!("{}: {:?}", self.desc, self.start.elapsed()) eprintln!("{}: {:?}", self.label, self.start.elapsed())
} }
} }
Guard { desc, start: Instant::now() } Guard { label, start: Instant::now() }
} }
pub struct Profiler { pub struct Profiler {
desc: Option<String>, label: Option<Label>,
} }
pub struct Filter { pub struct Filter {
@ -174,7 +175,7 @@ struct ProfileStack {
struct Message { struct Message {
level: usize, level: usize,
duration: Duration, duration: Duration,
message: String, label: Label,
} }
impl ProfileStack { impl ProfileStack {
@ -200,14 +201,13 @@ thread_local!(static PROFILE_STACK: RefCell<ProfileStack> = RefCell::new(Profile
impl Drop for Profiler { impl Drop for Profiler {
fn drop(&mut self) { fn drop(&mut self) {
match self { match self {
Profiler { desc: Some(desc) } => { Profiler { label: Some(label) } => {
PROFILE_STACK.with(|stack| { PROFILE_STACK.with(|stack| {
let mut stack = stack.borrow_mut(); let mut stack = stack.borrow_mut();
let start = stack.starts.pop().unwrap(); let start = stack.starts.pop().unwrap();
let duration = start.elapsed(); let duration = start.elapsed();
let level = stack.starts.len(); let level = stack.starts.len();
let message = mem::replace(desc, String::new()); stack.messages.push(Message { level, duration, label: label });
stack.messages.push(Message { level, duration, message });
if level == 0 { if level == 0 {
let stdout = stderr(); let stdout = stderr();
let longer_than = stack.filter_data.longer_than; let longer_than = stack.filter_data.longer_than;
@ -221,7 +221,7 @@ impl Drop for Profiler {
} }
}); });
} }
Profiler { desc: None } => (), Profiler { label: None } => (),
} }
} }
} }
@ -244,7 +244,7 @@ fn print_for_idx(
) { ) {
let current = &msgs[current_idx]; let current = &msgs[current_idx];
let current_indent = " ".repeat(current.level); let current_indent = " ".repeat(current.level);
writeln!(out, "{}{:5}ms - {}", current_indent, current.duration.as_millis(), current.message) writeln!(out, "{}{:5}ms - {}", current_indent, current.duration.as_millis(), current.label)
.expect("printing profiling info"); .expect("printing profiling info");
let longer_than_millis = longer_than.as_millis(); let longer_than_millis = longer_than.as_millis();
@ -257,7 +257,7 @@ fn print_for_idx(
if child.duration.as_millis() > longer_than_millis { if child.duration.as_millis() > longer_than_millis {
print_for_idx(*child_idx, children_map, msgs, longer_than, out); print_for_idx(*child_idx, children_map, msgs, longer_than, out);
} else { } else {
let pair = short_children.entry(&child.message).or_insert((Duration::default(), 0)); let pair = short_children.entry(child.label).or_insert((Duration::default(), 0));
pair.0 += child.duration; pair.0 += child.duration;
pair.1 += 1; pair.1 += 1;
} }
@ -409,9 +409,9 @@ mod tests {
fn test_longer_than() { fn test_longer_than() {
let mut result = vec![]; let mut result = vec![];
let msgs = vec![ let msgs = vec![
Message { level: 1, duration: Duration::from_nanos(3), message: "bar".to_owned() }, Message { level: 1, duration: Duration::from_nanos(3), label: "bar" },
Message { level: 1, duration: Duration::from_nanos(2), message: "bar".to_owned() }, Message { level: 1, duration: Duration::from_nanos(2), label: "bar" },
Message { level: 0, duration: Duration::from_millis(1), message: "foo".to_owned() }, Message { level: 0, duration: Duration::from_millis(1), label: "foo" },
]; ];
print(&msgs, Duration::from_millis(0), &mut result); print(&msgs, Duration::from_millis(0), &mut result);
// The calls to `bar` are so short that they'll be rounded to 0ms and should get collapsed // The calls to `bar` are so short that they'll be rounded to 0ms and should get collapsed
@ -426,8 +426,8 @@ mod tests {
fn test_unaccounted_for_topmost() { fn test_unaccounted_for_topmost() {
let mut result = vec![]; let mut result = vec![];
let msgs = vec![ let msgs = vec![
Message { level: 1, duration: Duration::from_millis(2), message: "bar".to_owned() }, Message { level: 1, duration: Duration::from_millis(2), label: "bar" },
Message { level: 0, duration: Duration::from_millis(5), message: "foo".to_owned() }, Message { level: 0, duration: Duration::from_millis(5), label: "foo" },
]; ];
print(&msgs, Duration::from_millis(0), &mut result); print(&msgs, Duration::from_millis(0), &mut result);
assert_eq!( assert_eq!(
@ -445,11 +445,11 @@ mod tests {
fn test_unaccounted_for_multiple_levels() { fn test_unaccounted_for_multiple_levels() {
let mut result = vec![]; let mut result = vec![];
let msgs = vec![ let msgs = vec![
Message { level: 2, duration: Duration::from_millis(3), message: "baz".to_owned() }, Message { level: 2, duration: Duration::from_millis(3), label: "baz" },
Message { level: 1, duration: Duration::from_millis(5), message: "bar".to_owned() }, Message { level: 1, duration: Duration::from_millis(5), label: "bar" },
Message { level: 2, duration: Duration::from_millis(2), message: "baz".to_owned() }, Message { level: 2, duration: Duration::from_millis(2), label: "baz" },
Message { level: 1, duration: Duration::from_millis(4), message: "bar".to_owned() }, Message { level: 1, duration: Duration::from_millis(4), label: "bar" },
Message { level: 0, duration: Duration::from_millis(9), message: "foo".to_owned() }, Message { level: 0, duration: Duration::from_millis(9), label: "foo" },
]; ];
print(&msgs, Duration::from_millis(0), &mut result); print(&msgs, Duration::from_millis(0), &mut result);
assert_eq!( assert_eq!(