fxhash

Cargo.lock

@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
 [[package]]
 name = "crossbeam-deque"
 version = "0.8.5"
@@ -33,10 +39,20 @@ version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
 
+[[package]]
+name = "fxhash"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c31b6d751ae2c7f11320402d34e41349dd1016f8d5d45e48c4312bc8625af50c"
+dependencies = [
+ "byteorder",
+]
+
 [[package]]
 name = "onebrc"
 version = "0.1.0"
 dependencies = [
+ "fxhash",
  "rayon",
 ]
 

Cargo.toml

@@ -6,4 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+fxhash = "0.2.1"
 rayon = "1.8.0"

src/main.rs

@@ -1,10 +1,10 @@
-use std::collections::HashMap;
+use fxhash::FxHashMap;
 use std::fs::File;
 use std::io::Read;
 use std::time::Instant;
 
 fn main() {
-    let mut map = HashMap::new();
+    let mut map = FxHashMap::default();
     let mut buf = Vec::new();
 
     let t1 = Instant::now();