scx_cosmos/
stats.rs

1use std::io::Write;
2use std::sync::atomic::AtomicBool;
3use std::sync::atomic::Ordering;
4use std::sync::Arc;
5use std::time::Duration;
6
7use anyhow::Result;
8use scx_stats::prelude::*;
9use scx_stats_derive::stat_doc;
10use scx_stats_derive::Stats;
11use serde::Deserialize;
12use serde::Serialize;
13
14#[stat_doc]
15#[derive(Clone, Debug, Default, Serialize, Deserialize, Stats)]
16#[stat(top)]
17pub struct Metrics {
18    #[stat(desc = "Direct dispatch due to high perf events (migration)")]
19    pub nr_event_dispatches: u64,
20    #[stat(desc = "Kept on same CPU due to perf sticky threshold")]
21    pub nr_ev_sticky_dispatches: u64,
22    #[stat(desc = "Direct dispatch due to GPU affinity")]
23    pub nr_gpu_dispatches: u64,
24}
25
26impl Metrics {
27    fn format<W: Write>(&self, w: &mut W) -> Result<()> {
28        writeln!(
29            w,
30            "[{}] ev_dispatches={} ev_sticky_dispatches={} gpu_dispatches={}",
31            crate::SCHEDULER_NAME,
32            self.nr_event_dispatches,
33            self.nr_ev_sticky_dispatches,
34            self.nr_gpu_dispatches,
35        )?;
36        Ok(())
37    }
38
39    fn delta(&self, rhs: &Self) -> Self {
40        Self {
41            nr_event_dispatches: self.nr_event_dispatches - rhs.nr_event_dispatches,
42            nr_ev_sticky_dispatches: self.nr_ev_sticky_dispatches - rhs.nr_ev_sticky_dispatches,
43            nr_gpu_dispatches: self.nr_gpu_dispatches - rhs.nr_gpu_dispatches,
44        }
45    }
46}
47
48pub fn server_data() -> StatsServerData<(), Metrics> {
49    let open: Box<dyn StatsOpener<(), Metrics>> = Box::new(move |(req_ch, res_ch)| {
50        req_ch.send(())?;
51        let mut prev = res_ch.recv()?;
52
53        let read: Box<dyn StatsReader<(), Metrics>> = Box::new(move |_args, (req_ch, res_ch)| {
54            req_ch.send(())?;
55            let cur = res_ch.recv()?;
56            let delta = cur.delta(&prev);
57            prev = cur;
58            delta.to_json()
59        });
60
61        Ok(read)
62    });
63
64    StatsServerData::new()
65        .add_meta(Metrics::meta())
66        .add_ops("top", StatsOps { open, close: None })
67}
68
69pub fn monitor(intv: Duration, shutdown: Arc<AtomicBool>) -> Result<()> {
70    scx_utils::monitor_stats::<Metrics>(
71        &[],
72        intv,
73        || shutdown.load(Ordering::Relaxed),
74        |metrics| metrics.format(&mut std::io::stdout()),
75    )
76}
scx_cosmos/stats.rs

scx_cosmos/
stats.rs
