nortega/indivisible-rs
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Parallelize prime testing.

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This commit is contained in:
Nicolás A. Ortega Froysa 2022-03-04 15:48:00 +01:00
parent b682ad9e9b
commit 5c8c7baa75
1 changed files with 8 additions and 16 deletions
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24
src/test.rs
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@ -17,6 +17,7 @@
*/
use std::collections::VecDeque;
use rayon::prelude::*;
pub fn is_prime_f(n:u64, b:u64) -> bool
{
@ -47,14 +48,9 @@ pub fn is_prime_f(n:u64, b:u64) -> bool
}
let limit = (n as f64).sqrt() as u64 + 1;
let mut res = true;
(start..limit).step_by(2).for_each(|x| {
if n % x == 0
{
res = false;
}
});
return res;
let compound = (start..limit).step_by(2).collect::<Vec<u64>>()
.par_iter().any(|x| n % x == 0);
return !compound;
}
pub fn is_prime(n:u64) -> bool
@ -65,12 +61,8 @@ pub fn is_prime(n:u64) -> bool
pub fn is_prime_mem(n:u64, primes:&VecDeque<u64>) -> bool
{
let limit = (n as f64).sqrt() as u64;
let mut res = true;
primes.iter().take_while(|x| **x <= limit).for_each(|x| {
if n % *x == 0
{
res = false;
}
});
return res;
let pp = primes.partition_point(|x| *x < limit);
//let compound = primes.par_iter().take(pp).any(|x| n % x == 0);
let compound = primes.iter().take(pp).any(|x| n % x == 0);
return !compound;
}