Fix prime calculator; more threads by default

src/is_prime.rs

@@ -17,7 +17,12 @@ pub mod prime_utils {
             return true;
         }
 
-        if number.sqrt().pow(2) == *number {
+        let sqrtnum = number.sqrt();
+
+        if sqrtnum.pow(2) == *number {
+            if number == &BigUint::from(23u8) {
+                eprintln!("SQRT check failed");
+            }
             return false;
         }
 
@@ -31,21 +36,23 @@ pub mod prime_utils {
             let one = BigUint::one();
             let zero = BigUint::zero();
 
-            let sqrtnum = number.sqrt() + &one; //fake ceil function
+            let sqrtnum = sqrtnum + &one; //fake ceil function
 
             for prime in g_primes {
                 if prime < &sqrtnum && number % prime == zero {
+                    if number == &BigUint::from(23u8) {
+                        eprintln!("Prime table check failed");
+                    }
                     return false;
                 }
             }
 
-            if !is_probably_prime(number, 5) {
-                return false;
-            }
-
             loop {
                 i += &one;
                 if number % &i == zero {
+                    if number == &BigUint::from(23u8) {
+                        eprintln!("manual check failed");
+                    }
                     return false;
                 }
                 if i == sqrtnum {
@@ -61,6 +68,12 @@ pub mod prime_utils {
             last = (last.pow(2) - &two) % number;
         }
 
-        last == BigUint::from(0u8)
+        let ret = last == BigUint::from(0u8);
+
+        if number == &BigUint::from(23u8) && !ret {
+            eprintln!("RET check failed");
+        }
+
+        ret
     }
 }

src/main.rs

@@ -65,8 +65,8 @@ fn main() {
     const N: i64 = 1_000_000;
     const NF: f64 = N as f64;
     const NU: usize = N as usize;
-    const THREADS: usize = 12;
-    const SPLITTER: u64 = N as u64 / 10;
+    const THREADS: usize = 30;
+    const SPLITTER: u64 = N as u64 / THREADS as u64;
 
     try_set_thread_priority();