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Optimize Emitter.fire for 0 and 1 listeners

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Before:
      Context "Emitter.fire()"
         Context "0 listeners"
            Case "#1" : 1 runs - average throughput: 97.77 MB/s
         Context "1 listener"
            Case "#1" : 1 runs - average throughput: 49.30 MB/s
         Context "2 listeners"
            Case "#1" : 1 runs - average throughput: 35.37 MB/s
         Context "5 listeners"
            Case "#1" : 1 runs - average throughput: 15.32 MB/s

After:
      Context "Emitter.fire()"
         Context "0 listeners"
            Case "#1" : 1 runs - average throughput: 376.94 MB/s
         Context "1 listener"
            Case "#1" : 1 runs - average throughput: 84.29 MB/s
         Context "2 listeners"
            Case "#1" : 1 runs - average throughput: 32.36 MB/s
         Context "5 listeners"
            Case "#1" : 1 runs - average throughput: 15.93 MB/s
This commit is contained in:
Daniel Imms
2026-01-31 14:42:23 -08:00
parent 21e4301e38
commit 042bb4bed9
3 changed files with 158 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
test/benchmark/Event.benchmark.ts
+72
View File
@@ -0,0 +1,72 @@
/**
* Copyright (c) 2026 The xterm.js authors. All rights reserved.
* @license MIT
*/
import { perfContext, before, ThroughputRuntimeCase } from 'xterm-benchmark';
import { Emitter } from 'common/Event';
const ITERATIONS = 1_000_000;
perfContext('Emitter.fire()', () => {
perfContext('0 listeners', () => {
let emitter: Emitter<number>;
before(() => {
emitter = new Emitter<number>();
});
new ThroughputRuntimeCase('', () => {
for (let i = 0; i < ITERATIONS; i++) {
emitter.fire(i);
}
return { payloadSize: ITERATIONS };
}, { fork: false }).showAverageThroughput();
});
perfContext('1 listener', () => {
let emitter: Emitter<number>;
let sum = 0;
before(() => {
emitter = new Emitter<number>();
emitter.event(e => { sum += e; });
});
new ThroughputRuntimeCase('', () => {
for (let i = 0; i < ITERATIONS; i++) {
emitter.fire(i);
}
return { payloadSize: ITERATIONS };
}, { fork: false }).showAverageThroughput();
});
perfContext('2 listeners', () => {
let emitter: Emitter<number>;
let sum = 0;
before(() => {
emitter = new Emitter<number>();
emitter.event(e => { sum += e; });
emitter.event(e => { sum += e * 2; });
});
new ThroughputRuntimeCase('', () => {
for (let i = 0; i < ITERATIONS; i++) {
emitter.fire(i);
}
return { payloadSize: ITERATIONS };
}, { fork: false }).showAverageThroughput();
});
perfContext('5 listeners', () => {
let emitter: Emitter<number>;
let sum = 0;
before(() => {
emitter = new Emitter<number>();
for (let j = 0; j < 5; j++) {
emitter.event(e => { sum += e; });
}
});
new ThroughputRuntimeCase('', () => {
for (let i = 0; i < ITERATIONS; i++) {
emitter.fire(i);
}
return { payloadSize: ITERATIONS };
}, { fork: false }).showAverageThroughput();
});
});