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Increase the size of the style sharing cache to 31.

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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:
Boris Zbarsky 2017-06-08 12:38:57 -04:00
parent 93271e199b
commit 2f2b93c521
2 changed files with 12 additions and 16 deletions
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12
components/style/sharing/mod.rs
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@ -84,8 +84,16 @@ 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.
///
/// The cache size was chosen by measuring style sharing and resulting
/// performance on a few pages; sizes up to about 32 were giving good sharing
/// improvements (e.g. 3x fewer styles having to be resolved than at size 8) and
/// slight performance improvements. Sizes larger than 32 haven't really been
/// tested.
pub const STYLE_SHARING_CANDIDATE_CACHE_SIZE: usize = 31;
/// Controls whether the style sharing cache is used.
#[derive(Clone, Copy, PartialEq)]