Struct style::context::TraversalStatistics

pub struct TraversalStatistics {
    pub elements_traversed: u32,
    pub elements_styled: u32,
    pub elements_matched: u32,
    pub styles_shared: u32,
    pub styles_reused: u32,
    pub selectors: u32,
    pub revalidation_selectors: u32,
    pub dependency_selectors: u32,
    pub declarations: u32,
    pub stylist_rebuilds: u32,
    pub traversal_time_ms: f64,
    pub is_parallel: Option<bool>,
    pub is_large: Option<bool>,
}

Statistics gathered during the traversal. We gather statistics on each thread and then combine them after the threads join via the Add implementation below.

Fields

elements_traversed: u32

The total number of elements traversed.

elements_styled: u32

The number of elements where has_styles() went from false to true.

elements_matched: u32

The number of elements for which we performed selector matching.

styles_shared: u32

The number of cache hits from the StyleSharingCache.

styles_reused: u32

The number of styles reused via rule node comparison from the StyleSharingCache.

selectors: u32

The number of selectors in the stylist.

revalidation_selectors: u32

The number of revalidation selectors.

dependency_selectors: u32

The number of state/attr dependencies in the dependency set.

declarations: u32

The number of declarations in the stylist.

stylist_rebuilds: u32

The number of times the stylist was rebuilt.

traversal_time_ms: f64

Time spent in the traversal, in milliseconds.

is_parallel: Option<bool>

Whether this was a parallel traversal.

is_large: Option<bool>

Whether this is a "large" traversal.

Methods

impl TraversalStatistics

pub fn finish<E, D>(&mut self, traversal: &D, parallel: bool, start: f64) where
    E: TElement,
    D: DomTraversal<E>, 

Computes the traversal time given the start time in seconds.

pub fn is_large_traversal(&self) -> bool

Returns whether this traversal is 'large' in order to avoid console spam from lots of tiny traversals.

Trait Implementations

impl Default for TraversalStatistics

fn default() -> TraversalStatistics

Returns the "default value" for a type.

impl<'a> Add for &'a TraversalStatistics

Implementation of Add to aggregate statistics across different threads.

type Output = TraversalStatistics

The resulting type after applying the + operator.

fn add(self, other: Self) -> TraversalStatistics

Performs the + operation.

impl Display for TraversalStatistics

Format the statistics in a way that the performance test harness understands. See https://bugzilla.mozilla.org/show_bug.cgi?id=1331856#c2

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

Formats the value using the given formatter.