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squeeze a little performance by using entry API in scheduler

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This commit is contained in:
Dustin Carlino 2020-04-30 11:24:57 -07:00
parent 1814857319
commit 7a0b9cd09a
1 changed files with 25 additions and 14 deletions
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29
sim/src/scheduler.rs
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@ -6,6 +6,7 @@ use geom::{Duration, Histogram, Time};
use map_model::{IntersectionID, Path, PathRequest};
use serde_derive::{Deserialize, Serialize};
use std::cmp::Ordering;
use std::collections::btree_map::Entry;
use std::collections::{BTreeMap, BinaryHeap};
#[derive(Serialize, Deserialize, PartialEq, Debug, Clone)]
@ -124,15 +125,19 @@ impl Scheduler {
let cmd_type = cmd.to_type();
// TODO Combo with entry API
if let Some((existing_cmd, existing_time)) = self.queued_commands.get(&cmd_type) {
match self.queued_commands.entry(cmd_type.clone()) {
Entry::Vacant(vacant) => {
vacant.insert((cmd, time));
self.items.push(Item { time, cmd_type });
}
Entry::Occupied(occupied) => {
let (existing_cmd, existing_time) = occupied.get();
panic!(
"Can't push({}, {:?}) because ({}, {:?}) already queued",
time, cmd, existing_time, existing_cmd
);
}
self.queued_commands.insert(cmd_type.clone(), (cmd, time));
self.items.push(Item { time, cmd_type });
}
}
pub fn update(&mut self, new_time: Time, cmd: Command) {
@ -193,13 +198,19 @@ impl Scheduler {
pub fn get_next(&mut self) -> Option<Command> {
let item = self.items.pop().unwrap();
self.latest_time = item.time;
let (_, cmd_time) = self.queued_commands.get(&item.cmd_type)?;
// Command was re-scheduled for later.
if *cmd_time > item.time {
match self.queued_commands.entry(item.cmd_type) {
Entry::Vacant(_) => {
// Command was cancelled
return None;
}
let (cmd, _) = self.queued_commands.remove(&item.cmd_type)?;
Some(cmd)
Entry::Occupied(occupied) => {
// Command was re-scheduled for later.
if occupied.get().1 > item.time {
return None;
}
Some(occupied.remove().0)
}
}
}
pub fn describe_stats(&self) -> String {