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flamegraph.rs
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flamegraph.rs
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// Copyright 2019 TiKV Project Authors. Licensed under Apache-2.0.
use std::fs::File;
#[inline(never)]
fn is_prime_number1(v: usize, prime_numbers: &[usize]) -> bool {
if v < 10000 {
let r = prime_numbers.binary_search(&v);
return r.is_ok();
}
for n in prime_numbers {
if v % n == 0 {
return false;
}
}
true
}
#[inline(always)]
fn is_prime_number2(v: usize, prime_numbers: &[usize]) -> bool {
if v < 10000 {
let r = prime_numbers.binary_search(&v);
return r.is_ok();
}
for n in prime_numbers {
if v % n == 0 {
return false;
}
}
true
}
#[inline(never)]
fn is_prime_number3(v: usize, prime_numbers: &[usize]) -> bool {
if v < 10000 {
let r = prime_numbers.binary_search(&v);
return r.is_ok();
}
for n in prime_numbers {
if v % n == 0 {
return false;
}
}
true
}
#[inline(never)]
fn prepare_prime_numbers() -> Vec<usize> {
// bootstrap: Generate a prime table of 0..10000
let mut prime_number_table: [bool; 10000] = [true; 10000];
prime_number_table[0] = false;
prime_number_table[1] = false;
for i in 2..10000 {
if prime_number_table[i] {
let mut v = i * 2;
while v < 10000 {
prime_number_table[v] = false;
v += i;
}
}
}
let mut prime_numbers = vec![];
for (i, exist) in prime_number_table.iter().enumerate().skip(2) {
if *exist {
prime_numbers.push(i);
}
}
prime_numbers
}
fn main() {
let prime_numbers = prepare_prime_numbers();
let guard = pprof::ProfilerGuard::new(100).unwrap();
let mut v = 0;
for i in 2..5000000 {
if i % 4 == 0 {
if is_prime_number1(i, &prime_numbers) {
v += 1;
}
} else if i % 4 == 1 {
if is_prime_number2(i, &prime_numbers) {
v += 1;
}
} else if is_prime_number3(i, &prime_numbers) {
v += 1;
}
}
println!("Prime numbers: {}", v);
if let Ok(report) = guard.report().build() {
let file = File::create("flamegraph.svg").unwrap();
report.flamegraph(file).unwrap();
println!("report: {:?}", &report);
};
}