Add a quickly put together Rust version

primes.rs

@@ -0,0 +1,68 @@
+use std::env;
+use std::time::{Instant, Duration};
+
+const PRIMES_COUNT: u32 = 10000000;
+
+fn get_primes7(count: u32) -> Vec<u32> {
+    if count < 2 {
+        return vec![];
+    } else if count == 2 {
+        return vec![2];
+    }
+
+    let mut s = Vec::with_capacity(count as usize / 2);
+    let mut i = 3;
+    while i < count+1 {
+        s.push(i);
+        i += 2;
+    }
+
+    let mroot = (count as f32).sqrt() as u32;
+    let half = s.len() as u32;
+
+    let mut i: u32 = 0;
+    let mut m: u32 = 3;
+
+    while m <= mroot {
+        if s.get(i as usize).is_some() && s[i as usize] != 0 {
+            let mut j = (m*m-3)/2;
+            s[j as usize] = 0;
+            while j < half {
+                s[j as usize] = 0;
+                j += m;
+            }
+        }
+        i += 1;
+        m = 2*i+3;
+    }
+
+    //s.push(2);
+    //s.retain(|&x| x != 0);
+    //s
+
+    //let mut res = Vec::with_capacity(count as usize /2);
+    let mut res = Vec::new();
+    res.push(2);
+    res.extend(s.into_iter().filter(|x| *x != 0));
+    res
+}
+
+fn main() {
+    let run_time_secs = match env::var("RUN_TIME") {
+        Ok(v) => match v.parse::<u32>() {
+            Ok(i) => i,
+            Err(err) => panic!("RUN_TIME environment variable error: {}", err),
+        },
+        Err(err) => panic!("RUN_TIME environment variable error: {}", err),
+    };
+
+    let run_time = Duration::new(run_time_secs as u64, 0);
+    let start = Instant::now();
+
+    while start.elapsed() < run_time {
+	    let primes = get_primes7(PRIMES_COUNT);
+        println!("Found {} prime numbers.", primes.len());
+    }
+}
+
+

run.sh

@@ -134,3 +134,9 @@ C='nodejs' ; SRC='primes.js' ; run_benchmark 'JavaScript (nodejs)' 'true' "$C $S
 ##
 
 C='ruby' ; SRC='primes.rb' ; run_benchmark 'Ruby' 'true' "$C $SRC" "$C -v" 'cat' "$SRC"
+
+##
+
+# -C opt-level=3 is the default opt level for the code produced by the --release target.
+C='rust'; SRC='primes.rs' ; run_benchmark 'Rust' 'rustc -C opt-level=3 -o primes.rs.out primes.rs' './primes.rs.out' 'rustc -V' 'head -n1' "$SRC"
+rm -f primes.rs.out