mirror of
https://github.com/servo/servo.git
synced 2025-08-03 12:40:06 +01:00
Increase the size of the style sharing cache to 31.
Still a lot of guesswork here, but this does seem to get us better sharing. See https://bugzilla.mozilla.org/show_bug.cgi?id=1369621 for some data.
This commit is contained in:
parent
f388c0ab1e
commit
21eafaa9f8
2 changed files with 10 additions and 6 deletions
|
@ -37,9 +37,11 @@ use traversal::{DomTraversal, PerLevelTraversalData, PreTraverseToken};
|
|||
///
|
||||
/// Larger values will increase style sharing cache hits and general DOM locality
|
||||
/// at the expense of decreased opportunities for parallelism. The style sharing
|
||||
/// cache can hold 8 entries, but not all styles are shareable, so we set this
|
||||
/// value to 16. These values have not been measured and could potentially be
|
||||
/// tuned.
|
||||
/// cache can hold 31 entries, but not all styles are shareable, so we set this
|
||||
/// value to 16. The size of the cache has been measured to provide pretty good
|
||||
/// sharing on a few pages, but could probably use more measurement and tuning.
|
||||
/// The work unit size is a bit of a guess at the moment; again could use
|
||||
/// measurement and tuning.
|
||||
pub const WORK_UNIT_MAX: usize = 16;
|
||||
|
||||
/// Verify that the style sharing cache size doesn't change. If it does, we should
|
||||
|
@ -48,7 +50,7 @@ pub const WORK_UNIT_MAX: usize = 16;
|
|||
/// have surprising effects on the parallelism characteristics of the style system.
|
||||
#[allow(dead_code)]
|
||||
fn static_assert() {
|
||||
unsafe { mem::transmute::<_, [u32; STYLE_SHARING_CANDIDATE_CACHE_SIZE]>([1; 8]); }
|
||||
unsafe { mem::transmute::<_, [u32; STYLE_SHARING_CANDIDATE_CACHE_SIZE]>([1; 31]); }
|
||||
}
|
||||
|
||||
/// A list of node pointers.
|
||||
|
|
|
@ -84,8 +84,10 @@ use stylist::{ApplicableDeclarationBlock, Stylist};
|
|||
mod checks;
|
||||
|
||||
/// The amount of nodes that the style sharing candidate cache should hold at
|
||||
/// most.
|
||||
pub const STYLE_SHARING_CANDIDATE_CACHE_SIZE: usize = 8;
|
||||
/// most. We'd somewhat like 32, but ArrayDeque only implements certain backing
|
||||
/// store sizes. A cache size of 32 would mean a backing store of 33, but
|
||||
/// that's not an implemented size: we can do 32 or 40.
|
||||
pub const STYLE_SHARING_CANDIDATE_CACHE_SIZE: usize = 31;
|
||||
|
||||
/// Controls whether the style sharing cache is used.
|
||||
#[derive(Clone, Copy, PartialEq)]
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue