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Add program to calculate primes

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master
Trivernis 4 years ago
parent 61c46e49df
commit 3287c021cb
5 changed files with 425 additions and 0 deletions
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5
.gitignore vendored
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/target
**/*.rs.bk
primes.txt
*.tar.gz
.idea

300
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11
Cargo.toml
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[package]
name = "primes"
version = "0.1.0"
authors = ["trivernis <trivernis@gmail.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
num_cpus = "1.0"
may = "0.3.16"

21
LICENSE
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MIT License
Copyright (c) 2020 parallel-programming-hwr
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

88
src/main.rs
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use may::go;
use may::sync::mpmc::{channel, Sender};
use num_cpus;
use std::env;
use std::fs::OpenOptions;
use std::io::prelude::*;
use std::io::BufWriter;
use std::time::Instant;
fn main() {
may::config().set_workers(num_cpus::get());
let (tx, rx) = channel::<u64>();
let num_threads: u16 = num_cpus::get() as u16;
let mut start: u64 = 1;
let args: Vec<String> = env::args().collect();
if args.len() > 1 {
start = args[1].parse::<u64>().unwrap();
}
if &start % 2 == 0 {
start += 1;
}
let file = OpenOptions::new()
.write(true)
.append(true)
.create(true)
.open("primes.txt")
.unwrap();
let mut buffer = BufWriter::new(file);
println!("Starting {} threads", num_threads);
for i in 0u16..num_threads {
let tx = tx.clone();
go!(move || {
get_primes(start + (2 * &i) as u64, (&num_threads * 2) as u64, 2_000_000, &tx);
});
println!("Started thread {}", i);
}
let time_start = Instant::now();
let mut prime_count = 0;
let mut primes: Vec<u64> = vec![];
// receives all prime numbers via the channel receiver.
// The received prime numbers are stored in a vector
loop {
let result = rx.recv();
match result {
Err(_) => break,
Ok(prime) => {
prime_count += 1;
primes.push(prime);
println!("\r{: <30}", prime);
print!(
"{} Primes/s",
prime_count as f64 / time_start.elapsed().as_secs_f64()
);
if let Err(e) = buffer.write(&format!("{}\n", prime).into_bytes()) {
panic!(e);
}
}
}
}
let mut prime_sum: u128 = 0;
for prime in primes {
prime_sum += prime as u128;
}
println!("Prime Sum: {}", prime_sum);
}
/// Calculates primes and increases by incr with every iteration
/// Resulting prime numbers are sent via the tx sender.
fn get_primes(start: u64, incr: u64, stop_after: u64, tx: &Sender<u64>) {
println!("Hi, I'm a thread.");
let mut num = start;
while num < stop_after {
let mut is_prime = true;
if (num < 3) | (&num % 2 == 0) {
num += incr;
continue;
}
for i in (3u64..&num / 2).step_by(2) {
if num % i == 0 {
is_prime = false;
}
}
if is_prime {
tx.send(num).unwrap();
}
num += incr;
}
}
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