Buffer Fragmentation and Challenges

[giscus[bot]]

Buffer Fragmentation and Challenges

Understanding memory fragmentation, challenges with buffer management, and solutions for optimal performance.

https://www.thenodebook.com/buffers/fragmentation-and-challenges

[dearzubi]

I believe there is an issue with the timestamp bytes in challenge 1. If we read it as double from the buffer, then it produces 1701896373.429757, the integer part is nowhere near the expected timestamp 1672531200000. Even if you create fractional part to integer it still is not close enough. However, if you use these bytes:
42 78 56 aa 0c 80 00 00 then it produces the correct result. I obtained them using:

const b = Buffer.alloc(8);
b.writeDoubleBE(1672531200000, 0);
console.log(b)

[Fujiirkfc]

Hello, I'm struggling with the Challenge #2, specially with the second part, the copy script simply doesn't collect the 50MB file after the copy allocation with the global.gc() and --expose-gc flag. I've tried some intervals and other changes in the code, but nothing worked:

import { Buffer } from 'node:buffer';

let fiftyBuffer = Buffer.alloc(50 * 1024 * 1024);
const views = [];

for (let i = 0; i < 100000; i++) {
  views.push(Buffer.from(fiftyBuffer.subarray(0, 16)));
}

fiftyBuffer = null;
global.gc();
const mem = process.memoryUsage();
console.log(mem);