[fulu] getBlobsV2 causes gc performance issue

[twoeths]

Describe the bug

refer to this profile

when I zoom in busy windows, it shows a lot of gc caused by getBlobsV2

Expected behavior

need to figure out how to save memory on this flow

Steps to reproduce

No response

Additional context

No response

Operating system

Linux

Lodestar version or commit hash

unstable

[twoeths]

if I run the same test here but instead of allocating each separate 32 bytes, I allocate 1 big Uint8Array and create sub arrays based on that

const buffer = new Uint8Array(arraySize * numArrays);

for (let i = 0; i < numArrays; i++) {
    // arrays.push(new Uint8Array(arraySize));
    arrays.push(buffer.subarray(i * arraySize, (i + 1) * arraySize));
}

• NodeJS separate Uint8Arrays: 241.74 MB
• NodeJS 1 big Uint8Array: 112.04 MB

we can allocate a big Uint8Array for getBlobsV2() api like the example above but guess it does not resolve the issue completely

[twoeths]

I guess we can only have much more improvement with Bun

• separate Uint8Arrays: 47.85 MB
• 1 big Uint8Array: 31.39 MB

[twoeths]

should not be an issue anymore, addressed through #8200