Optimize data structure to store listeners in EventTarget #48964
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Summary: Changelog: [internal] Adds benchmarks for `addEventListener` in benchmark file for `EventTarget`. Baseline: | (index) | Task name | Latency average (ns) | Latency median (ns) | Throughput average (ops/s) | Throughput median (ops/s) | Samples | | ------- | --------------------------------------------------------------------- | --------------------- | ---------------------- | -------------------------- | ------------------------- | ------- | | 0 | 'dispatchEvent, no bubbling, no listeners' | '4624.68 ± 0.49%' | '4570.00' | '218089 ± 0.02%' | '218818' | 216232 | | 1 | 'dispatchEvent, no bubbling, single listener' | '5771.34 ± 0.99%' | '5670.00' | '175389 ± 0.02%' | '176367' | 173270 | | 2 | 'dispatchEvent, no bubbling, multiple listeners' | '48207.35 ± 1.18%' | '47290.00' | '20964 ± 0.04%' | '21146' | 20744 | | 3 | 'dispatchEvent, bubbling, no listeners' | '185005.29 ± 0.16%' | '184060.00' | '5410 ± 0.05%' | '5433' | 5406 | | 4 | 'dispatchEvent, bubbling, single listener per target' | '286630.57 ± 0.11%' | '285560.00' | '3491 ± 0.06%' | '3502' | 3489 | | 5 | 'dispatchEvent, bubbling, multiple listeners per target' | '4435944.62 ± 0.27%' | '4425840.00 ± 30.00' | '226 ± 0.12%' | '226' | 1000 | | 6 | 'addEventListener, one listener' | '1734.88 ± 0.57%' | '1670.00' | '594938 ± 0.01%' | '598802' | 576411 | | 7 | 'addEventListener, one target, one type, multiple listeners' | '266031.11 ± 0.68%' | '261810.00' | '3781 ± 0.15%' | '3820' | 3759 | | 8 | 'addEventListener, one target, multiple types, one listener per type' | '124768.56 ± 0.39%' | '121160.00' | '8112 ± 0.16%' | '8254' | 8015 | | 9 | 'addEventListener, one target, multiple types, multiple listeners' | '27141326.31 ± 0.15%' | '27298945.00 ± 115.00' | '37 ± 0.15%' | '37' | 1000 | | 10 | 'addEventListener, multiple targets, one type, one listener' | '142646.24 ± 0.49%' | '137460.00' | '7123 ± 0.19%' | '7275' | 7011 | Differential Revision: D68708145
…8964) Summary: Changelog: [internal] This replaces the data structure used to store listeners in `EventTarget`, from a map of arrays to a map of maps. This essentially optimizes listener registration/deregistraton at the expense of event dispatching. Given that it'll be common to have many nodes registering to events that are never dispatched, this might be the right trade-off. * Before: | (index) | Task name | Latency average (ns) | Latency median (ns) | Throughput average (ops/s) | Throughput median (ops/s) | Samples | | ------- | --------------------------------------------------------------------- | --------------------- | ---------------------- | -------------------------- | ------------------------- | ------- | | 0 | 'dispatchEvent, no bubbling, no listeners' | '4624.68 ± 0.49%' | '4570.00' | '218089 ± 0.02%' | '218818' | 216232 | | 1 | 'dispatchEvent, no bubbling, single listener' | '5771.34 ± 0.99%' | '5670.00' | '175389 ± 0.02%' | '176367' | 173270 | | 2 | 'dispatchEvent, no bubbling, multiple listeners' | '48207.35 ± 1.18%' | '47290.00' | '20964 ± 0.04%' | '21146' | 20744 | | 3 | 'dispatchEvent, bubbling, no listeners' | '185005.29 ± 0.16%' | '184060.00' | '5410 ± 0.05%' | '5433' | 5406 | | 4 | 'dispatchEvent, bubbling, single listener per target' | '286630.57 ± 0.11%' | '285560.00' | '3491 ± 0.06%' | '3502' | 3489 | | 5 | 'dispatchEvent, bubbling, multiple listeners per target' | '4435944.62 ± 0.27%' | '4425840.00 ± 30.00' | '226 ± 0.12%' | '226' | 1000 | | 6 | 'addEventListener, one listener' | '1734.88 ± 0.57%' | '1670.00' | '594938 ± 0.01%' | '598802' | 576411 | | 7 | 'addEventListener, one target, one type, multiple listeners' | '266031.11 ± 0.68%' | '261810.00' | '3781 ± 0.15%' | '3820' | 3759 | | 8 | 'addEventListener, one target, multiple types, one listener per type' | '124768.56 ± 0.39%' | '121160.00' | '8112 ± 0.16%' | '8254' | 8015 | | 9 | 'addEventListener, one target, multiple types, multiple listeners' | '27141326.31 ± 0.15%' | '27298945.00 ± 115.00' | '37 ± 0.15%' | '37' | 1000 | | 10 | 'addEventListener, multiple targets, one type, one listener' | '142646.24 ± 0.49%' | '137460.00' | '7123 ± 0.19%' | '7275' | 7011 | * After: | (index) | Task name | Latency average (ns) | Latency median (ns) | Throughput average (ops/s) | Throughput median (ops/s) | Samples | | ------- | --------------------------------------------------------------------- | --------------------- | --------------------- | -------------------------- | ------------------------- | ------- | | 0 | 'dispatchEvent, no bubbling, no listeners' | '4518.27 ± 0.51%' | '4460.00' | '223269 ± 0.02%' | '224215' | 221324 | | 1 | 'dispatchEvent, no bubbling, single listener' | '6563.10 ± 0.98%' | '6450.00' | '154311 ± 0.02%' | '155039' | 152367 | | 2 | 'dispatchEvent, no bubbling, multiple listeners' | '65429.69 ± 0.25%' | '64840.00' | '15330 ± 0.05%' | '15423' | 15284 | | 3 | 'dispatchEvent, bubbling, no listeners' | '181104.21 ± 0.13%' | '180300.00' | '5525 ± 0.05%' | '5546' | 5522 | | 4 | 'dispatchEvent, bubbling, single listener per target' | '367231.05 ± 0.10%' | '366035.00 ± 5.00' | '2724 ± 0.07%' | '2732' | 2724 | | 5 | 'dispatchEvent, bubbling, multiple listeners per target' | '6269141.58 ± 0.24%' | '6253275.00 ± 155.00' | '160 ± 0.11%' | '160' | 1000 | | 6 | 'addEventListener, one listener' | '1665.23 ± 0.51%' | '1610.00' | '618122 ± 0.01%' | '621118' | 600517 | | 7 | 'addEventListener, one target, one type, multiple listeners' | '97724.12 ± 1.34%' | '94640.00' | '10433 ± 0.14%' | '10566' | 10233 | | 8 | 'addEventListener, one target, multiple types, one listener per type' | '116915.60 ± 0.54%' | '113380.00' | '8707 ± 0.17%' | '8820' | 8554 | | 9 | 'addEventListener, one target, multiple types, multiple listeners' | '12276537.38 ± 0.42%' | '11924070.00 ± 10.00' | '82 ± 0.35%' | '84' | 1000 | | 10 | 'addEventListener, multiple targets, one type, one listener' | '133307.67 ± 0.58%' | '128340.00' | '7666 ± 0.20%' | '7792' | 7502 | Differential Revision: D68671944
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This pull request has been merged in 3d4906e. |
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Changelog: [internal]
This replaces the data structure used to store listeners in
EventTarget, from a map of arrays to a map of maps.This essentially optimizes listener registration/deregistraton at the expense of event dispatching. Given that it'll be common to have many nodes registering to events that are never dispatched, this might be the right trade-off.
Differential Revision: D68671944