Cursor AgentandDaniel Imms
9872be0c29
Skip O(cols) _copyCellMapsFrom loop when the source line has no sparse combined/extended map entries (scroll recycle from cached blank line). Copy sparse entries by map keys only when needed. Add CDP profiling script and BufferLine.copyFrom micro-benchmark. Co-authored-by: Daniel Imms <Tyriar@users.noreply.github.com>
56 lines
1.9 KiB
TypeScript
56 lines
1.9 KiB
TypeScript
/**
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* Copyright (c) 2026 The xterm.js authors. All rights reserved.
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* @license MIT
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*/
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import { perfContext, before, RuntimeCase } from 'xterm-benchmark';
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import { BufferLine } from 'common/buffer/BufferLine';
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import { BufferLineStringCache } from 'common/buffer/BufferLineStringCache';
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import { DEFAULT_ATTR_DATA } from 'common/buffer/BufferLine';
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import { CellData } from 'common/buffer/CellData';
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import { NULL_CELL_CHAR, NULL_CELL_WIDTH, NULL_CELL_CODE } from 'common/buffer/Constants';
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const ITERATIONS = 500_000;
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const stringCache = new BufferLineStringCache();
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const nullCell = CellData.fromCharData([0, NULL_CELL_CHAR, NULL_CELL_WIDTH, NULL_CELL_CODE]);
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const yCell = CellData.fromCharData([0, 'y', 1, 'y'.charCodeAt(0)]);
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function setupScrollRecyclePair(cols: number): { recycled: BufferLine; blank: BufferLine } {
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const blank = new BufferLine(stringCache, cols, nullCell, false);
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const recycled = new BufferLine(stringCache, cols, yCell, false);
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for (let i = 0; i < cols; i++) {
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recycled.setCellFromCodepoint(i, 'y'.charCodeAt(0), 1, DEFAULT_ATTR_DATA);
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}
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return { recycled, blank };
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}
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perfContext('BufferLine.copyFrom (scroll recycle)', () => {
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perfContext('cols=80', () => {
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let recycled: BufferLine;
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let blank: BufferLine;
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before(() => {
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({ recycled, blank } = setupScrollRecyclePair(80));
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});
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new RuntimeCase('', () => {
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for (let i = 0; i < ITERATIONS; i++) {
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recycled.copyFrom(blank);
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}
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return { payloadSize: ITERATIONS };
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}, { fork: false }).showAverageRuntime();
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});
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perfContext('cols=279', () => {
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let recycled: BufferLine;
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let blank: BufferLine;
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before(() => {
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({ recycled, blank } = setupScrollRecyclePair(279));
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});
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new RuntimeCase('', () => {
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for (let i = 0; i < ITERATIONS; i++) {
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recycled.copyFrom(blank);
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}
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return { payloadSize: ITERATIONS };
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}, { fork: false }).showAverageRuntime();
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});
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});
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