SHD-WebsiteFingerprintingLab/part1/warmup.js

const runs = 10;
const N= 393216;
function measureOneLine() {
  const LINE_SIZE = 8; // 64/sizeof(double) Note that js treats all numbers as double
  let result = [];

  // Fill with -1 to ensure allocation
  const M = new Array(runs * LINE_SIZE).fill(-1);

  for (let i = 0; i < runs; i++) {
    const start = performance.now();
    let val = M[i * LINE_SIZE];
    const end = performance.now();

    result.push((end - start).toFixed(2));
  }

  return result;
}

function measureNLines() {
  const LINE_SIZE = 8; // 64/sizeof(double) Note that js treats all numbers as double
  let result = [];

  // Fill with -1 to ensure allocation
  const M = new Array(runs * N * LINE_SIZE).fill(-1);
  for (let i = 0; i < runs; i++) {
    const start = performance.now();
    for (let j = 0; j < N; j++) {
      let val = M[i * N * LINE_SIZE + j * LINE_SIZE];
    }
    const end = performance.now();

    result.push((end - start).toFixed(2));
  }

  return result;
}

document.getElementById(
  "exercise1-values"
).innerText = `1 Cache Line: [${measureOneLine().join(", ")}]`;

document.getElementById(
  "exercise2-values"
).innerText = `N Cache Lines: [${measureNLines().join(", ")}]`;