Struct tokio_metrics::RuntimeMonitor

pub struct RuntimeMonitor { /* private fields */ }

This is supported on tokio_unstable and crate feature rt only.

Monitors key metrics of the tokio runtime.

Usage

use std::time::Duration;
use tokio_metrics::RuntimeMonitor;
 
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    let handle = tokio::runtime::Handle::current();
 
    // print runtime metrics every 500ms
    {
        let runtime_monitor = RuntimeMonitor::new(&handle);
        tokio::spawn(async move {
            for interval in runtime_monitor.intervals() {
                // pretty-print the metric interval
                println!("{:?}", interval);
                // wait 500ms
                tokio::time::sleep(Duration::from_millis(500)).await;
            }
        });
    }
 
    // await some tasks
    tokio::join![
        do_work(),
        do_work(),
        do_work(),
    ];
 
    Ok(())
}
 
async fn do_work() {
    for _ in 0..25 {
        tokio::task::yield_now().await;
        tokio::time::sleep(Duration::from_millis(100)).await;
    }
}

Implementations

impl RuntimeMonitor

pub fn new(runtime: &Handle) -> RuntimeMonitor

pub fn intervals(&self) -> impl Iterator<Item = RuntimeMetrics>