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Simpler switch test

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This commit is contained in:
Jeremy Soller
2016-10-21 07:35:46 -06:00
parent bbb5d70e86
commit 9faaf3a969
1 changed files with 14 additions and 15 deletions
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29
src/main.rs
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@@ -4,30 +4,29 @@ extern crate x86;
fn switch_test() -> Result<(), String> {
use std::thread;
use std::time::Instant;
use x86::time::rdtscp;
let switch_thread = thread::spawn(|| {
for i in 0..100 {
let time = Instant::now();
let tsc = unsafe { rdtscp() };
let tsc = unsafe { rdtscp() };
let switch_thread = thread::spawn(|| -> usize {
let mut j = 0;
while j < 500 {
thread::yield_now();
let dtsc = unsafe { rdtscp() } - tsc;
let dtime = time.elapsed();
print!("{}", format!("C: {}: {} ns: {} ticks\n", i, dtime.as_secs() * 1000000000 + dtime.subsec_nanos() as u64, dtsc));
j += 1;
}
j
});
for i in 0..100 {
let time = Instant::now();
let tsc = unsafe { rdtscp() };
let mut i = 0;
while i < 500 {
thread::yield_now();
let dtsc = unsafe { rdtscp() } - tsc;
let dtime = time.elapsed();
print!("{}", format!("P: {}: {} ns: {} ticks\n", i, dtime.as_secs() * 1000000000 + dtime.subsec_nanos() as u64, dtsc));
i += 1;
}
let _ = switch_thread.join();
let j = switch_thread.join().unwrap();
let dtsc = unsafe { rdtscp() } - tsc;
println!("P {} C {} T {}", i, j, dtsc);
Ok(())
}