wehub-resource-sync
71 lines
2.4 KiB
JavaScript
71 lines
2.4 KiB
JavaScript
#!/usr/bin/env node
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/**
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* Decomposes cross-terminal pipeline results: feeds the same fixtures from
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* terminal-pipeline-bench through a bare @xterm/headless Terminal — no Orca
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* layers, no IPC, no rendering — to locate where throughput is lost.
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*
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* If headless xterm parses a fixture near the plain-text rate, the pipeline
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* gap for that fixture lives in Orca's layers (delivery, side-effect
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* scanning, renderer paint). If headless collapses too, the cost is intrinsic
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* to xterm.js's parser/buffer for that byte pattern.
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*
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* Usage:
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* node tools/benchmarks/terminal-headless-parse-bench.mjs
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* [--size-mb 10] [--cols 114] [--rows 85] [--scrollback 5000]
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*/
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import { performance } from 'node:perf_hooks'
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import xterm from '@xterm/headless'
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import { buildFixture } from './terminal-pipeline-bench.mjs'
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const { Terminal } = xterm
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const CHUNK = 64 * 1024
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function arg(name, fallback) {
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const i = process.argv.indexOf(name)
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return i === -1 ? fallback : Number(process.argv[i + 1])
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}
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const sizeMb = arg('--size-mb', 10)
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const cols = arg('--cols', 114)
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const rows = arg('--rows', 85)
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const scrollback = arg('--scrollback', 5000)
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const targetBytes = Math.floor(sizeMb * 1024 * 1024)
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function writeAll(term, data) {
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return new Promise((resolve) => {
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let offset = 0
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const next = () => {
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if (offset >= data.length) {
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resolve()
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return
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}
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const chunk = data.slice(offset, offset + CHUNK)
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offset += CHUNK
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// write callback fires after the chunk is parsed — same "fully parsed"
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// fence semantics as the DSR fence in the pipeline bench.
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term.write(chunk, next)
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}
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next()
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})
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}
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const FIXTURES = ['ascii-log', 'cjk-emoji', 'agent-tui', 'styles-stress']
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console.log(
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`headless xterm ${cols}x${rows} scrollback=${scrollback}, ${sizeMb}MB per fixture (parse-only, no render)`
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)
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for (const name of FIXTURES) {
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const fixture = buildFixture(name, targetBytes, cols, rows)
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const bytes = Buffer.byteLength(fixture, 'utf8')
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const term = new Terminal({ cols, rows, scrollback, allowProposedApi: true })
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// Warmup primes JIT so the first fixture isn't penalized.
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await writeAll(term, fixture.slice(0, 256 * 1024))
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const start = performance.now()
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await writeAll(term, fixture)
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const ms = performance.now() - start
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console.log(
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`${name.padEnd(15)} ${(bytes / 1024 / 1024 / (ms / 1000)).toFixed(1).padStart(7)} MB/s (${ms.toFixed(0)}ms)`
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)
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term.dispose()
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}
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