commit | 22b8a401e8867d1689f9fc0d2a696636fb2e6c74 | [log] [tgz] |
---|---|---|
author | Zhiyuan Wang <zhiyuanwang@google.com> | Tue Sep 03 16:57:15 2024 -0700 |
committer | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | Thu Dec 19 12:34:34 2024 -0800 |
tree | f49f2082d3aacf85b7eadaff172339d82a63c626 | |
parent | 20c2b3a4f850d4e7ceb5fde4126a37fedf0bd6e2 [diff] |
Improve DataStoreImpl latency for data.first(): 1. data flow only start updateCollector after emitting the first element in data flow, so it won't start for data.first() calls; 2. refactor updateCollection to get rid of flow based implementations, instead use reference counting to make data flows share a coroutine to collect updates. Based on the micro-benchmark running on a Pixel 7 test device (clock locked), the minimum, median and p90 latency are reduced from HEAD's 471, 479 and 483 microseconds to 49.9, 51.1 and 51.9 microseconds. This change brings a 838% improvement for the cached data.first() read median latency. Bug: b/354802764 Test: ./gradlew :datastore:datastore-benchmark:connectedAndroidTest (cherry picked from https://android-review.googlesource.com/q/commit:7141b99f2c4001ec9ffbdbfda533ddaa90c0ec77) (cherry picked from https://android-review.googlesource.com/q/commit:c4cdbc0aba7064165a21fcefefede409b74ae3cd) Merged-In: I11a1ae0a5f546ffb1e780d3f3b7a5f1a17817dfc Change-Id: I11a1ae0a5f546ffb1e780d3f3b7a5f1a17817dfc
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