bench.ts

import { open, makeCursor, read } from "./rx";
import { readFileSync } from "fs";

function bench(name: string, fn: () => void, iterations = 1000) {
  for (let i = 0; i < 10; i++) fn();
  const start = performance.now();
  for (let i = 0; i < iterations; i++) fn();
  const elapsed = performance.now() - start;
  const perOp = (elapsed / iterations).toFixed(3);
  console.log(`  ${name}: ${perOp}ms/op`);
}

const buf = new Uint8Array(readFileSync("/Users/tim/Code/rex/large-sample.rexc"));
console.log(`File size: ${(buf.length / 1024).toFixed(0)} KB`);

const c = makeCursor(buf);
read(c);
console.log(`Root: tag=${c.tag}, ixWidth=${c.ixWidth}, ixCount=${c.ixCount}\n`);

const KEYS = ["/_next/static/build-TfctsWXpff2fKS/_buildManifest.js", "/_next/static/chunks/63b4a9a7997e818a.js", "/_next/static/chunks/cf97eeb48024010b.js", "/_next/static/media/argon-ai-light.8ef23dec.svg", "/_next/static/media/chevron-up-small.f5c11a24.svg", "/_next/static/media/eight-vc-dark.fcd6494c.svg", "/_next/static/media/graph-cms-dark.a2e84b60.svg", "/_next/static/media/KaTeX_Size1-Regular.05ccfb2d.woff2", "/_next/static/media/logo-python-color-light.c87538f0.svg", "/_next/static/media/moo-dark.f9160728.svg", "/_next/static/media/pipe-dark.2bd7a84f.svg", "/_next/static/media/shotgun-light.3e01402a.svg", "/_next/static/media/tiger-global-dark.5ddf0d90.svg", "/_next/static/media/whop-light.436f9659.svg", "/home/[homeFlagsCode]/cheaper", "/ai-gateway/eyJhbGciOiJIUzI1NiJ9._g.N1f6Zv80UkaRFRNiMW5MpF0mlOe4Kp7FJQK4M1FWxhQ/models/codex-mini.segments/_full.segment.rsc", 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for (let i = 0; i < 10; i++) {
  console.log()
  console.log(`35K-key real dataset, 100 random lookups per iteration:`);
  bench("open + 100 lookups", () => {
    const root = open(buf) as any;
    for (const k of KEYS) root[k];
  }, 100);

  bench("open + 1 lookup", () => {
    (open(buf) as any)[KEYS[50]!];
  }, 500);

  bench("open only", () => {
    open(buf);
  }, 500);

  // Object.keys (forces full enumeration)
  bench("open + Object.keys", () => {
    Object.keys(open(buf) as any);
  }, 20);

  // JSON comparison
  const root = open(buf) as any;
  const jsonStr = JSON.stringify(Object.fromEntries(Object.entries(root)));
  console.log(`\nJSON equivalent: ${(jsonStr.length / 1024).toFixed(0)} KB vs rexc: ${(buf.length / 1024).toFixed(0)} KB`);
  bench("JSON.parse", () => { JSON.parse(jsonStr); }, 20);
  bench("JSON.parse + 100 lookups", () => {
    const obj = JSON.parse(jsonStr);
    for (const k of KEYS) obj[k];
  }, 20);
}