172 lines
5.5 KiB
Rust
172 lines
5.5 KiB
Rust
//! The `timing` module provides std::time utility functions.
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use {
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crate::unchecked_div_by_const,
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std::{
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sync::atomic::{AtomicU64, Ordering},
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time::{Duration, SystemTime, UNIX_EPOCH},
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},
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};
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pub fn duration_as_ns(d: &Duration) -> u64 {
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d.as_secs()
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.saturating_mul(1_000_000_000)
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.saturating_add(u64::from(d.subsec_nanos()))
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}
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pub fn duration_as_us(d: &Duration) -> u64 {
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d.as_secs()
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.saturating_mul(1_000_000)
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.saturating_add(unchecked_div_by_const!(u64::from(d.subsec_nanos()), 1_000))
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}
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pub fn duration_as_ms(d: &Duration) -> u64 {
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d.as_secs()
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.saturating_mul(1000)
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.saturating_add(unchecked_div_by_const!(
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u64::from(d.subsec_nanos()),
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1_000_000
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))
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}
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pub fn duration_as_s(d: &Duration) -> f32 {
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d.as_secs() as f32 + (d.subsec_nanos() as f32 / 1_000_000_000.0)
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}
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/// return timestamp as ms
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pub fn timestamp() -> u64 {
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let now = SystemTime::now()
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.duration_since(UNIX_EPOCH)
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.expect("create timestamp in timing");
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duration_as_ms(&now)
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}
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pub const SECONDS_PER_YEAR: f64 = 365.242_199 * 24.0 * 60.0 * 60.0;
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/// from years to slots
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pub fn years_as_slots(years: f64, tick_duration: &Duration, ticks_per_slot: u64) -> f64 {
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// slots is years * slots/year
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years *
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// slots/year is seconds/year ...
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SECONDS_PER_YEAR
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// * (ns/s)/(ns/tick) / ticks/slot = 1/s/1/tick = ticks/s
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* (1_000_000_000.0 / duration_as_ns(tick_duration) as f64)
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// / ticks/slot
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/ ticks_per_slot as f64
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}
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/// From slots per year to slot duration
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pub fn slot_duration_from_slots_per_year(slots_per_year: f64) -> Duration {
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// Recently, rust changed from infinity as usize being zero to 2^64-1; ensure it's zero here
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let slot_in_ns = if slots_per_year != 0.0 {
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(SECONDS_PER_YEAR * 1_000_000_000.0) / slots_per_year
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} else {
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0.0
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};
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Duration::from_nanos(slot_in_ns as u64)
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}
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#[derive(Debug, Default)]
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pub struct AtomicInterval {
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last_update: AtomicU64,
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}
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impl AtomicInterval {
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/// true if 'interval_time_ms' has elapsed since last time we returned true as long as it has been 'interval_time_ms' since this struct was created
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pub fn should_update(&self, interval_time_ms: u64) -> bool {
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self.should_update_ext(interval_time_ms, true)
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}
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/// a primary use case is periodic metric reporting, potentially from different threads
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/// true if 'interval_time_ms' has elapsed since last time we returned true
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/// except, if skip_first=false, false until 'interval_time_ms' has elapsed since this struct was created
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pub fn should_update_ext(&self, interval_time_ms: u64, skip_first: bool) -> bool {
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let now = timestamp();
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let last = self.last_update.load(Ordering::Relaxed);
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now.saturating_sub(last) > interval_time_ms
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&& self
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.last_update
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.compare_exchange(last, now, Ordering::Relaxed, Ordering::Relaxed)
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== Ok(last)
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&& !(skip_first && last == 0)
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}
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/// return ms elapsed since the last time the time was set
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pub fn elapsed_ms(&self) -> u64 {
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let now = timestamp();
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let last = self.last_update.load(Ordering::Relaxed);
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now.saturating_sub(last) // wrapping somehow?
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}
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/// return ms until the interval_time will have elapsed
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pub fn remaining_until_next_interval(&self, interval_time: u64) -> u64 {
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interval_time.saturating_sub(self.elapsed_ms())
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_interval_update() {
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solana_logger::setup();
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let i = AtomicInterval::default();
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assert!(!i.should_update(1000));
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let i = AtomicInterval::default();
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assert!(i.should_update_ext(1000, false));
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std::thread::sleep(Duration::from_millis(10));
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assert!(i.elapsed_ms() > 9 && i.elapsed_ms() < 1000);
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assert!(
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i.remaining_until_next_interval(1000) > 9
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&& i.remaining_until_next_interval(1000) < 991
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);
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assert!(i.should_update(9));
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assert!(!i.should_update(100));
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}
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#[test]
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#[allow(clippy::float_cmp)]
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fn test_years_as_slots() {
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let tick_duration = Duration::from_micros(1000 * 1000 / 160);
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// interestingly large numbers with 160 ticks/second
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assert_eq!(years_as_slots(0.0, &tick_duration, 4) as u64, 0);
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assert_eq!(
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years_as_slots(1.0 / 12f64, &tick_duration, 4) as u64,
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105_189_753
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);
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assert_eq!(years_as_slots(1.0, &tick_duration, 4) as u64, 1_262_277_039);
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let tick_duration = Duration::from_micros(1000 * 1000);
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// one second in years with one tick per second + one tick per slot
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assert_eq!(
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years_as_slots(1.0 / SECONDS_PER_YEAR, &tick_duration, 1),
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1.0
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);
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}
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#[test]
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fn test_slot_duration_from_slots_per_year() {
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let slots_per_year = 1_262_277_039.0;
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let ticks_per_slot = 4;
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assert_eq!(
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slot_duration_from_slots_per_year(slots_per_year),
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Duration::from_micros(1000 * 1000 / 160) * ticks_per_slot
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);
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assert_eq!(
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slot_duration_from_slots_per_year(0.0),
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Duration::from_micros(0) * ticks_per_slot
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);
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let slots_per_year = SECONDS_PER_YEAR;
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let ticks_per_slot = 1;
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assert_eq!(
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slot_duration_from_slots_per_year(slots_per_year),
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Duration::from_millis(1000) * ticks_per_slot
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);
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}
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}
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