corehello

// these aren't _quite_ functional tests,
// and should all be compile_fail,
// but may be illustrative

#[test]
fn concurrent_set() {
    use std::sync::Arc;
    let x = Arc::new(Cell::new(42));
    let x1 = Arc::clone(&x);
    std::thread::spawn(move || {

corehello

Latency Comparison Numbers
--------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD