Struct tokio::runtime::RuntimeMetrics

pub struct RuntimeMetrics { /* private fields */ }

Handle to the runtime’s metrics.

This handle is internally reference-counted and can be freely cloned. A RuntimeMetrics handle is obtained using the Runtime::metrics method.

Implementations

impl RuntimeMetrics

pub fn num_workers(&self) -> usize

Returns the number of worker threads used by the runtime.

The number of workers is set by configuring worker_threads on runtime::Builder. When using the current_thread runtime, the return value is always 1.

Examples

use tokio::runtime::Handle;

#[tokio::main]
async fn main() {
    let metrics = Handle::current().metrics();

    let n = metrics.num_workers();
    println!("Runtime is using {} workers", n);
}

pub fn num_alive_tasks(&self) -> usize

Returns the current number of alive tasks in the runtime.

This counter increases when a task is spawned and decreases when a task exits.

Examples

use tokio::runtime::Handle;

#[tokio::main]
async fn main() {
   let metrics = Handle::current().metrics();

    let n = metrics.num_alive_tasks();
    println!("Runtime has {} alive tasks", n);
}

Trait Implementations

impl Clone for RuntimeMetrics

fn clone(&self) -> RuntimeMetrics

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RuntimeMetrics

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.