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Neil
ba86e1c83c
* perf: scan diagnostic environment lines without repeated whitespace searches * perf(observability): skip redundant terminator scans in environment-line redaction After a successful match ENV_LINE.lastIndex already sits at end of input or a line terminator, and a failed start's whitespace skip plus terminator scan collapse into one LINE_CONTENT exec. Byte-identical output; verified against the pre-change regex over 280k generated inputs. * perf(observability): find environment-line ends without entering the regex engine
48 lines
1.7 KiB
JavaScript
48 lines
1.7 KiB
JavaScript
import assert from 'node:assert/strict'
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import { readFileSync } from 'node:fs'
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import { stripTypeScriptTypes } from 'node:module'
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import { performance } from 'node:perf_hooks'
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import { redactString } from '../../src/main/observability/redactor.ts'
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// Supply an unchanged redactor.ts snapshot to measure the actual previous production function.
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const baselinePath = process.argv[2]
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if (!baselinePath) {
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throw new Error(
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'Usage: node config/scripts/redactor-environment-lines-benchmark.mjs <baseline-redactor.ts>'
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)
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}
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const baselineSource = stripTypeScriptTypes(readFileSync(baselinePath, 'utf8'))
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const { redactString: before } = await import(
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`data:text/javascript;base64,${Buffer.from(baselineSource).toString('base64')}`
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)
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function median(fn, input, repeats) {
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const samples = []
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for (let run = 0; run < repeats; run++) {
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const started = performance.now()
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fn(input)
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samples.push(performance.now() - started)
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}
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return samples.sort((a, b) => a - b)[Math.floor(samples.length / 2)]
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}
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const rows = []
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for (const [shape, input] of [
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['8KiB blank lines', '\n'.repeat(8192)],
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['16KiB blank lines', '\n'.repeat(16384)],
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['32KiB blank lines', '\n'.repeat(32768)],
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['32KiB blank lines then invalid key', `${'\n'.repeat(32768)}lowercase`],
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['ordinary env', 'FOO=value\nBAR=other\n'],
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['ordinary message', 'Cannot read directory /workspace/source: file not found']
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]) {
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assert.equal(redactString(input), before(input))
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const beforeMs = median(before, input, 3)
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const afterMs = median(redactString, input, 15)
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rows.push({
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shape,
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bytes: Buffer.byteLength(input),
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beforeMs,
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afterMs,
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speedup: beforeMs / afterMs
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})
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}
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console.log(JSON.stringify({ node: process.version, platform: process.platform, rows }, null, 2))
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