Struct tokio::runtime::RuntimeMetrics

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pub struct RuntimeMetrics { /* private fields */ }
Expand description

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.

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impl RuntimeMetrics

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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);
}
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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§

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impl Clone for RuntimeMetrics

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fn clone(&self) -> RuntimeMetrics

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for RuntimeMetrics

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.