m: Try using ahash

Signed-off-by: John Nunley <dev@notgull.net>

Author: notgull

Cargo.toml

@@ -15,6 +15,7 @@ categories = ["asynchronous", "concurrency"]
 exclude = ["/.*"]
 
 [dependencies]
+ahash = "0.8.11"
 async-task = "4.4.0"
 concurrent-queue = "2.0.0"
 fastrand = "2.0.0"

src/lib.rs

@@ -38,7 +38,6 @@
     html_logo_url = "https://raw.githubusercontent.com/smol-rs/smol/master/assets/images/logo_fullsize_transparent.png"
 )]
 
-use std::collections::HashMap;
 use std::fmt;
 use std::marker::PhantomData;
 use std::panic::{RefUnwindSafe, UnwindSafe};
@@ -48,6 +47,7 @@ use std::sync::{Arc, Mutex, RwLock, TryLockError};
 use std::task::{Poll, Waker};
 use std::thread::{self, ThreadId};
 
+use ahash::AHashMap;
 use async_task::{Builder, Runnable};
 use concurrent_queue::ConcurrentQueue;
 use futures_lite::{future, prelude::*};
@@ -715,7 +715,7 @@ struct State {
     /// Local queues created by runners.
     ///
     /// These are keyed by the thread that the runner originated in.
-    local_queues: RwLock<HashMap<ThreadId, Vec<Arc<LocalQueue>>>>,
+    local_queues: RwLock<AHashMap<ThreadId, Vec<Arc<LocalQueue>>>>,
 
     /// Set to `true` when a sleeping ticker is notified or no tickers are sleeping.
     notified: AtomicBool,
@@ -732,7 +732,7 @@ impl State {
     fn new() -> State {
         State {
             queue: ConcurrentQueue::unbounded(),
-            local_queues: RwLock::new(HashMap::new()),
+            local_queues: RwLock::new(AHashMap::new()),
             notified: AtomicBool::new(true),
             sleepers: Mutex::new(Sleepers {
                 count: 0,
@@ -1185,7 +1185,7 @@ fn debug_executor(executor: &Executor<'_>, name: &str, f: &mut fmt::Formatter<'_
     }
 
     /// Debug wrapper for the local runners.
-    struct LocalRunners<'a>(&'a RwLock<HashMap<ThreadId, Vec<Arc<LocalQueue>>>>);
+    struct LocalRunners<'a>(&'a RwLock<AHashMap<ThreadId, Vec<Arc<LocalQueue>>>>);
 
     impl fmt::Debug for LocalRunners<'_> {
         fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {