mirror of
https://github.com/servo/servo.git
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265 lines
8.6 KiB
Rust
265 lines
8.6 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Timing functions.
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use std_time::precise_time_ns;
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use collections::treemap::TreeMap;
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use std::comm::{Sender, channel, Receiver};
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use std::f64;
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use std::iter::AdditiveIterator;
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use std::io::timer::sleep;
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use task::{spawn_named};
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use url::Url;
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// front-end representation of the profiler used to communicate with the profiler
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#[deriving(Clone)]
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pub struct TimeProfilerChan(pub Sender<TimeProfilerMsg>);
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impl TimeProfilerChan {
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pub fn send(&self, msg: TimeProfilerMsg) {
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let TimeProfilerChan(ref c) = *self;
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c.send(msg);
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}
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}
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#[deriving(PartialEq, Clone, PartialOrd, Eq, Ord)]
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pub struct TimerMetadata {
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url: String,
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iframe: bool,
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first_reflow: bool,
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}
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pub trait Formatable {
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fn format(&self) -> String;
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}
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impl Formatable for Option<TimerMetadata> {
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fn format(&self) -> String {
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match self {
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// TODO(cgaebel): Center-align in the format strings as soon as rustc supports it.
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&Some(ref meta) => {
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let url = meta.url.as_slice();
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let first_reflow = if meta.first_reflow { " yes" } else { " no " };
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let iframe = if meta.iframe { " yes" } else { " no " };
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format!(" {:14} {:9} {:30}", first_reflow, iframe, url)
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},
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&None =>
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format!(" {:14} {:9} {:30}", " N/A", " N/A", " N/A")
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}
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}
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}
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#[deriving(Clone)]
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pub enum TimeProfilerMsg {
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/// Normal message used for reporting time
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TimeMsg((TimeProfilerCategory, Option<TimerMetadata>), f64),
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/// Message used to force print the profiling metrics
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PrintMsg,
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/// Tells the profiler to shut down.
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ExitMsg,
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}
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#[repr(u32)]
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#[deriving(PartialEq, Clone, PartialOrd, Eq, Ord)]
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pub enum TimeProfilerCategory {
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CompositingCategory,
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LayoutPerformCategory,
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LayoutStyleRecalcCategory,
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LayoutSelectorMatchCategory,
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LayoutTreeBuilderCategory,
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LayoutDamagePropagateCategory,
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LayoutMainCategory,
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LayoutParallelWarmupCategory,
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LayoutShapingCategory,
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LayoutDispListBuildCategory,
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RenderingDrawingCategory,
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RenderingPrepBuffCategory,
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RenderingCategory,
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}
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impl Formatable for TimeProfilerCategory {
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// some categories are subcategories of LayoutPerformCategory
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// and should be printed to indicate this
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fn format(&self) -> String {
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let padding = match *self {
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LayoutStyleRecalcCategory |
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LayoutMainCategory |
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LayoutDispListBuildCategory |
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LayoutShapingCategory |
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LayoutDamagePropagateCategory => "+ ",
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LayoutParallelWarmupCategory |
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LayoutSelectorMatchCategory |
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LayoutTreeBuilderCategory => "| + ",
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_ => ""
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};
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let name = match *self {
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CompositingCategory => "Compositing",
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LayoutPerformCategory => "Layout",
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LayoutStyleRecalcCategory => "Style Recalc",
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LayoutSelectorMatchCategory => "Selector Matching",
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LayoutTreeBuilderCategory => "Tree Building",
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LayoutDamagePropagateCategory => "Damage Propagation",
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LayoutMainCategory => "Primary Layout Pass",
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LayoutParallelWarmupCategory => "Parallel Warmup",
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LayoutShapingCategory => "Shaping",
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LayoutDispListBuildCategory => "Display List Construction",
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RenderingDrawingCategory => "Draw",
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RenderingPrepBuffCategory => "Buffer Prep",
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RenderingCategory => "Rendering",
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};
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format!("{:s}{}", padding, name)
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}
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}
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type TimeProfilerBuckets = TreeMap<(TimeProfilerCategory, Option<TimerMetadata>), Vec<f64>>;
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// back end of the profiler that handles data aggregation and performance metrics
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pub struct TimeProfiler {
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pub port: Receiver<TimeProfilerMsg>,
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buckets: TimeProfilerBuckets,
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pub last_msg: Option<TimeProfilerMsg>,
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}
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impl TimeProfiler {
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pub fn create(period: Option<f64>) -> TimeProfilerChan {
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let (chan, port) = channel();
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match period {
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Some(period) => {
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let period = (period * 1000f64) as u64;
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let chan = chan.clone();
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spawn_named("Time profiler timer", proc() {
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loop {
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sleep(period);
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if chan.send_opt(PrintMsg).is_err() {
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break;
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}
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}
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});
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// Spawn the time profiler.
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spawn_named("Time profiler", proc() {
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let mut profiler = TimeProfiler::new(port);
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profiler.start();
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});
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}
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None => {
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// No-op to handle messages when the time profiler is inactive.
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spawn_named("Time profiler", proc() {
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loop {
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match port.recv_opt() {
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Err(_) | Ok(ExitMsg) => break,
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_ => {}
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}
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}
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});
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}
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}
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TimeProfilerChan(chan)
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}
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pub fn new(port: Receiver<TimeProfilerMsg>) -> TimeProfiler {
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TimeProfiler {
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port: port,
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buckets: TreeMap::new(),
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last_msg: None,
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}
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}
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pub fn start(&mut self) {
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loop {
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let msg = self.port.recv_opt();
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match msg {
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Ok(msg) => {
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if !self.handle_msg(msg) {
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break
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}
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}
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_ => break
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}
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}
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}
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fn find_or_insert(&mut self, k: (TimeProfilerCategory, Option<TimerMetadata>), t: f64) {
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match self.buckets.find_mut(&k) {
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None => {},
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Some(v) => { v.push(t); return; },
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}
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self.buckets.insert(k, vec!(t));
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}
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fn handle_msg(&mut self, msg: TimeProfilerMsg) -> bool {
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match msg.clone() {
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TimeMsg(k, t) => self.find_or_insert(k, t),
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PrintMsg => match self.last_msg {
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// only print if more data has arrived since the last printout
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Some(TimeMsg(..)) => self.print_buckets(),
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_ => ()
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},
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ExitMsg => return false,
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};
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self.last_msg = Some(msg);
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true
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}
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fn print_buckets(&mut self) {
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println!("{:35s} {:14} {:9} {:30} {:15s} {:15s} {:-15s} {:-15s} {:-15s}",
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"_category_", "_incremental?_", "_iframe?_",
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" _url_", " _mean (ms)_", " _median (ms)_",
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" _min (ms)_", " _max (ms)_", " _events_");
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for (&(ref category, ref meta), ref mut data) in self.buckets.mut_iter() {
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data.sort_by(|a, b| {
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if a < b {
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Less
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} else {
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Greater
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}
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});
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let data_len = data.len();
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if data_len > 0 {
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let (mean, median, min, max) =
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(data.iter().map(|&x|x).sum() / (data_len as f64),
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data.as_slice()[data_len / 2],
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data.iter().fold(f64::INFINITY, |a, &b| a.min(b)),
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data.iter().fold(-f64::INFINITY, |a, &b| a.max(b)));
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println!("{:-35s}{} {:15.4f} {:15.4f} {:15.4f} {:15.4f} {:15u}",
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category.format(), meta.format(), mean, median, min, max, data_len);
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}
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}
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println!("");
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}
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}
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pub fn profile<T>(category: TimeProfilerCategory,
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// url, iframe?, first reflow?
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meta: Option<(&Url, bool, bool)>,
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time_profiler_chan: TimeProfilerChan,
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callback: || -> T)
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-> T {
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let start_time = precise_time_ns();
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let val = callback();
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let end_time = precise_time_ns();
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let ms = (end_time - start_time) as f64 / 1000000f64;
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let meta = meta.map(|(url, iframe, first_reflow)|
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TimerMetadata {
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url: url.serialize(),
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iframe: iframe,
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first_reflow: first_reflow,
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});
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time_profiler_chan.send(TimeMsg((category, meta), ms));
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return val;
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}
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pub fn time<T>(msg: &str, callback: || -> T) -> T{
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let start_time = precise_time_ns();
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let val = callback();
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let end_time = precise_time_ns();
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let ms = (end_time - start_time) as f64 / 1000000f64;
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if ms >= 5f64 {
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debug!("{:s} took {} ms", msg, ms);
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}
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return val;
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}
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