| commit | 4c6326353796ed628b916624264d1bacf0339064 | [log] [tgz] |
|---|---|---|
| author | Martin Kustermann <kustermann@google.com> | Fri Feb 14 03:51:04 2025 -0800 |
| committer | Martin Kustermann <kustermann@google.com> | Fri Feb 14 03:51:04 2025 -0800 |
| tree | f942c1dc36ecb6b9feaec7de020a1f59ea39ce0c | |
| parent | 572b5017491ee57de382fb65898dbd5bd50b8fbb [diff] |
[dart2wasm] Avoid repeatedly allocating strings for the same json object keys Most jsons have ascii strings as keys in json objects and very often those keys are highly repetitive. In previous CLs we started to compute the hash of the json object keys eagerly, even before allocating the string. We can take advantage of this now by using consulting a fixed-size interning cache. The cost of this cache is * Memory: It has max 512 entries and only contains one byte strings used as keys in json (keys are usually very small). * Lookup: Bitmask and lookup in array, length comparison (fails often if keys are not the same), plus byte comparison (may often suceeed) * Insert: Simply store into an array. The benefit is that we are very likely to allocate a lot less string objects for the keys. This will make data fit better in caches, will make string equality checks (in map lookups) more often hit the fast case (pointer equality) and reduce GC pressure. Change-Id: Id8ed3a972a267dd0201383f8f51ed82758bc0e63 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/409680 Reviewed-by: Ömer Ağacan <omersa@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>
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