import { openSync, writeSync, fsyncSync, closeSync, rmSync, mkdtempSync } from "node:fs";
import { join } from "node:path";
for (const base of process.argv.slice(2)) {
  const d = mkdtempSync(join(base, "dw-fsync-"));
  const t = [];
  for (let i = 0; i < 30; i++) {
    const s = performance.now();
    const fd = openSync(join(d, `f${i}`), "w");
    writeSync(fd, "x".repeat(512));
    fsyncSync(fd);
    closeSync(fd);
    t.push(performance.now() - s);
  }
  rmSync(d, { recursive: true });
  t.sort((a, b) => a - b);
  console.log(`${base}: write+fsync median ${t[15].toFixed(2)} ms, p90 ${t[27].toFixed(2)} ms`);
}