nodejs
worker_threads is used by many people,but we can only use SharedArrayBuffer(for shared memory) ,but Buffer is node's first citizen（socket eg）,can you share Buffer to SharedArrayBuffer ?
What is the problem this feature will solve?
threads_worker is used by many people,but we can only use SharedArrayBuffer ,but Buffer is node's first citizen（socket eg）,can you share Buffer to SharedArrayBuffer ?
What is the feature you are proposing to solve the problem?
let instance=SharedArrayBuffer.from(Buffer instance);//zero copy let instance2=Buffer.From(SharedArrayBuffer instance);//zero copy
What alternatives have you considered?
No response
You mean node:worker_threads, right? If all buffers could be shared, the language would not have bothered to come up with a SharedArrayBuffer implementation. What you can do is the following:
function sabToBuffer(sab) {
return new Uint8Array(sab);
}
Uint8Array is not exactly a Buffer, but I don't think you'll find any Node.js API that accept Buffer and not Uint8Array (if you do, that'd be a bug, please report it).
On the other hand, if you have a Buffer/Uint8Array and want to transfer its content to an other thread, you have two options:
// Option 1: copy the content to a SharedArrayBuffer:
function copyBufferToSAB(buffer, sab) {
if (buffer.byteLength > sab.byteLength) throw new Error('Buffer overflow');
new Uint8Array(sab).set(buffer);
}
// Option 2: transfer the underlying array buffer:
function transferBuffer(buffer) {
otherThread.postMessage(buffer, [buffer.buffer]);
}
Option 2 is way faster, but note that only one thread interact with a non-sharable buffer, meaning that once it is transfered, the original thread can no longer have access to that buffer data.
no,you are wrong. copy ArrayBuffer is so expensive
I don't know why you say I'm wrong, I don't think I have said anything about copy not being expensive. Like I said, transfering is the faster option, that's the one that let you reuse the same data on another thread without copying data.
@introspection3 @aduh95 is this issue resolved? If so, feel free to close the issue!
Thanks!
