Struct ProgressCounter

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

A ProgressCounter is used to efficiently track the progress of a task occurring across multiple threads.

Imagine you have the following code:

use rayon::prelude::*;

let mut v: Vec<usize> = (0..1_000).collect();
v.par_iter_mut().for_each(|v| { *v += 1; });

Now you want to track the progress of this loop. You can use Arc<Mutex<T>> like so:

use rayon::prelude::*;
use std::sync::{Arc, Mutex};

let mut v: Vec<usize> = (0..1_000).collect();
let progress_counter = Arc::new(Mutex::new(0));
v.par_iter_mut().for_each(|v| {
  *v += 1;
  *progress_counter.lock().unwrap() += 1;
});

However, because the work done in each loop iteration is small, a large portion of time will be spent waiting on the mutex. A better choice in this case is to use atomics. ProgressCounter is a convenient wrapper around atomics for use in tracking progress. This example will now run much faster:

use rayon::prelude::*;
use tangram_progress_counter::ProgressCounter;

let mut v: Vec<usize> = (0..1_000).collect();
let progress_counter = ProgressCounter::new(v.len() as u64);
v.par_iter_mut().for_each(|v| {
  *v += 1;
  progress_counter.inc(1);
});

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impl ProgressCounter

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pub fn new(total: u64) -> ProgressCounter

Create a new ProgressCounter that will count from 0 up to the specified total.

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pub fn total(&self) -> u64

Retrieve the total value this ProgressCounter counts up to.

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pub fn get(&self) -> u64

Retrieve the current progress value.

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pub fn set(&self, value: u64)

Set the current progress value.

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pub fn inc(&self, amount: u64)

Increment the progress value by amount.

Trait Implementations§

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impl Clone for ProgressCounter

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fn clone(&self) -> ProgressCounter

Returns a duplicate 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 ProgressCounter

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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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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. 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.