use easy_parallel from smol project instead of std::thread. No performance improvement, but easier

src/main/rust/src/implementations/multi_threaded_smol.rs

@@ -1,23 +1,21 @@
-use std::collections::HashMap;
 use smol::fs::File;
 use smol::io::{AsyncBufReadExt, AsyncSeekExt, BufReader, SeekFrom};
+use std::collections::HashMap;
 
 use crate::models::station_measurements::StationMeasurements;
 use crate::utils::parse;
-use std::sync::mpsc;
+use crate::utils::parse::hashstr;
+use easy_parallel::Parallel;
 use std::thread;
 use std::time::Instant;
-use crate::utils::parse::hashstr;
 
 const DEFAULT_HASHMAP_LENGTH: usize = 10000;
 
 pub fn run() {
     const FILE_PATH: &str = "../../../measurements.txt";
     let now = Instant::now();
-    thread::scope(|s| {
     let mut stations: HashMap<usize, (String, StationMeasurements)> =
         HashMap::with_capacity(DEFAULT_HASHMAP_LENGTH);
-        let (tx, rx) = mpsc::channel();
     let cores = thread::available_parallelism().unwrap().into();
     let bounds = smol::block_on(async {
         let mut file = File::open(FILE_PATH)
@@ -46,11 +44,10 @@ pub fn run() {
         bounds.push(file_length);
         bounds
     });
-        for i in 0..cores {
-            let tx = tx.clone();
+    let t_stations_vec = Parallel::new()
+        .each(0..cores, |i| {
             let mut currposition = *bounds.get(i).unwrap();
             let end = *bounds.get(i + 1).unwrap();
-            s.spawn(move || {
             smol::block_on(async {
                 let mut file = File::open(FILE_PATH)
                     .await
@@ -90,12 +87,11 @@ pub fn run() {
                     }
                     line.clear();
                 }
-                    let _ = tx.send(t_stations);
+                t_stations
             })
-            });
-        }
-        drop(tx);
-        while let Ok(t_stations) = rx.recv() {
+        })
+        .run();
+    for t_stations in t_stations_vec {
         for (hash, (station, measurements)) in t_stations.iter() {
             let joined_measurements_options = stations.get_mut(hash);
             if let Some((_, joined_measurements)) = joined_measurements_options {
@@ -130,5 +126,4 @@ pub fn run() {
         println!("\n\n{{{stations}}}");
     }
     println!("\n\nTime={} ms", now.elapsed().as_millis());
-    });
 }