[Question] The difference between Buffer and ArrayBuffer

[richerfu]

Affected URL(s)

No response

Description of the problem

I'd like to confirm: Does ArrayBuffer in node allocate shared heap memory for objects, and is Buffer a separate chunk from the heap memory?

If that's the case, isn't the size theoretically allocated by ArrayBuffer equivalent to the size of the heap memory(Maybe 1.7G?), and isn't the theoretical size of buffer max_length?

According to #3012 , there was a related description a long time ago, but now there is no related description in the document.

[richerfu]

I try to init arraybuffer and out the memory info with process. ArrayBuffer seems to be malloc with external memory.

const convertToMB = value => {
    return (value / 1024 / 1024).toFixed(2) + ' MB';
};

const showMem = () => {
    const info = process.memoryUsage();
    console.log('rss: ', convertToMB(info.rss));
    console.log('heapTotal: ', convertToMB(info.heapTotal));
    console.log('heapUsed: ', convertToMB(info.heapUsed));
    console.log('external: ', convertToMB(info.external));
    console.log("\n");
}

showMem();
const buff = new ArrayBuffer(1024 * 1024 * 200);
showMem();