read data into rust

rust/src/main.rs

@@ -1,156 +1,11 @@
-use rayon::join;
+use std::fs;
-
-fn partition<T, F>(d: &mut [T], is_less: &F) -> usize
-where
-    F: Fn(&T, &T) -> bool,
-{
-    d.swap(0, d.len() / 2);
-    let mut mid = 0;
-    for i in 1..d.len() {
-        if is_less(&d[i], &d[0]) {
-            mid += 1;
-            d.swap(i, mid);
-        }
-    }
-    d.swap(0, mid);
-    mid
-}
-
-fn insert_sort<T, F>(d: &mut [T], is_less: &F)
-where
-    F: Fn(&T, &T) -> bool,
-{
-    for i in 1..d.len() {
-        let mut n = i;
-        while n > 0 && is_less(&d[n], &d[n - 1]) {
-            d.swap(n, n - 1);
-            n -= 1;
-        }
-    }
-}
-
-fn quick_sort<T, F>(d: &mut [T], is_less: &F)
-where
-    F: Fn(&T, &T) -> bool,
-{
-    if d.len() > 30 {
-        let mut mid = partition(d, is_less);
-        if mid < d.len() / 2 {
-            mid += 1;
-        }
-        let (left, right) = d.split_at_mut(mid);
-        quick_sort(left, is_less);
-        quick_sort(right, is_less);
-    } else {
-        insert_sort(d, is_less);
-    }
-}
-
-fn par_quick_sort<T, F>(d: &mut [T], is_less: &F)
-where
-    F: Fn(&T, &T) -> bool + Send + Sync,
-    T: Send,
-{
-    if d.len() > 30 {
-        let mut mid = partition(d, is_less);
-        if mid < d.len() / 2 {
-            mid += 1;
-        }
-        let (left, right) = d.split_at_mut(mid);
-
-        if right.len() > 100_000 {
-            join(
-                || par_quick_sort(left, is_less),
-                || par_quick_sort(right, is_less),
-            );
-        } else {
-            quick_sort(left, is_less);
-            quick_sort(right, is_less);
-        }
-    } else {
-        insert_sort(d, is_less);
-    }
-}
-
-pub trait QSort<T> {
-    fn qsort(&mut self);
-
-    fn is_sorted(&self) -> bool;
-}
-
-impl<T> QSort<T> for [T]
-where
-    T: Ord,
-{
-    fn qsort(&mut self) {
-        quick_sort(self, &|a: &T, b: &T| a.lt(b));
-    }
-
-    fn is_sorted(&self) -> bool {
-        self.windows(2).all(|w| w[0] <= w[1])
-    }
-}
-
-pub trait ParQSort<T> {
-    fn par_qsort(&mut self);
-}
-
-impl<T> ParQSort<T> for [T]
-where
-    T: Ord + Send,
-{
-    fn par_qsort(&mut self) {
-        par_quick_sort(self, &|a: &T, b: &T| a.lt(b));
-    }
-}
-
-use rand::distributions::{Distribution, Uniform};
-use rand::thread_rng;
-use rayon::prelude::*;
-use std::time::Instant;
 
 fn main() {
-    let len = 50_000_000;
+    let input = fs::read_to_string("../data/perm50e3.txt")
-    let orig: Vec<i32> = Uniform::from(0..1_000_000_000)
+        .expect("Could not read file")
-        .sample_iter(&mut thread_rng())
+        .lines()
-        .take(len)
+        .map(|s| s.parse::<u64>().unwrap())
-        .collect();
+        .collect::<Vec<u64>>();
 
-    macro_rules! test_sort {
+    println!("{}", input.len());
-        ($name:expr, $sort:ident) => {
-            println!(
-                "Sorting {} million numbers with {} in Rust ...",
-                len / 1_000_000,
-                $name
-            );
-            let mut data = orig.clone();
-            let start = Instant::now();
-            data.$sort();
-            println!("Time: {:.2?}", start.elapsed());
-            assert!(data.is_sorted());
-        }
-    }
-
-    test_sort!("naive quicksort", qsort);
-    test_sort!("stdlib quicksort", sort_unstable);
-    test_sort!("naive parallel quicksort", par_qsort);
-    test_sort!("Rayon quicksort", par_sort_unstable);
-}
-
-#[cfg(test)]
-mod test {
-    use super::*;
-    use quickcheck::quickcheck;
-
-    quickcheck! {
-        fn test_all(d: Vec<i32>) -> bool {
-            let mut d = d;
-
-            let mut expected = d.clone();
-            expected.sort_unstable();
-            d.par_qsort();
-
-            expected == d
-        }
-    }
 }