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use std::cell::RefCell; #[allow(unused_imports)] use std::sync::atomic::{AtomicU64, Ordering::Relaxed}; use std::time::Instant; const BENCH_ITER_COUNT:u64 = 100001; pub fn main() { // Performace benchmark Test: // loop & results memory config... let mut result_data: Vec<String> = Vec::new(); let mut raw_val: Vec<u128> = Vec::new(); let mut refcell_val: Vec<u128> = Vec::new(); let mut count = 0u64; // benchmark loop... while count < BENCH_ITER_COUNT { // raw way... unsafe { let mut m3 = SomeMemory::new(); let checka = Instant::now(); //(*(&mut m3 as *mut SomeMemory)).mem2.store(count, Relaxed); (*(&mut m3 as *mut SomeMemory)).mem4 = count; let ref value = *(&m3 as *const SomeMemory); let timea = checka.elapsed().as_nanos(); result_data.push(format!( "raw -> val:{:?} memory mutation perf:{}(ns)", value, timea )); raw_val.push(timea); } // Refcell way... let m4 = RefCell::new(SomeMemory::new()); let checkb = Instant::now(); let ref m5 = m4; //m5.borrow_mut().mem2.store(count, Relaxed); m5.borrow_mut().mem4 = count; let timeb = checkb.elapsed().as_nanos(); result_data.push(format!( "RefCell -> val:{:?} memory mutation perf:{}(ns)", m5.borrow(), timeb )); refcell_val.push(timeb); count += 1; } let raw_min = raw_val.iter().min().unwrap(); let refcell_min = refcell_val.iter().min().unwrap(); // result display. println!( "\nOS exception:\nraw way: {}ns (at best)\nrefcell way: {}ns (at best)\n", raw_min, refcell_min ); if raw_val.len() == refcell_val.len() { // compute the average. let raw_average = raw_val.iter().sum::<u128>() / (raw_val.len() as u128); let refcell_average = refcell_val.iter().sum::<u128>() / (refcell_val.len() as u128); // result display. println!( "Average performance counter :\nfor raw: {}ns\nfor RefCell: {}ns", raw_average, refcell_average ); } } #[allow(dead_code)] #[derive(Debug)] struct SomeMemory { mem1: AtomicU64, mem2: AtomicU64, mem3: AtomicU64, mem4: u64, } impl SomeMemory { fn new() -> Self { Self { mem1: AtomicU64::new(0u64), mem2: AtomicU64::new(0u64), mem3: AtomicU64::new(0u64), mem4: 0, } } }
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