[softfalcon]

Interesting, thanks for the info, I'll do some reading on what you're saying. I agree, you're right about JS having issues with hiccups in the UI due to scheduling on a single process thread.

Makes a lot of sense, cool that the garbage collector can run independently of the call stack and function scheduler.

[vlovich123]

OP doesn’t know what he’s talking about. Creating an object per byte is insane to do if you care about performance. It’ll be fine if you do 1000 objects once or this isn’t particularly performance sensitive. That’s fine. But the GC running concurrently doesn’t change anything about that, not to mention that he’s wrong and the scavenger phase for the young generation (which is typically where you find byte arrays being processed like this) is stop the world. Certain phases of the old generation collection are concurrent but notably finalization (deleting all the objects) is also stop the world as is compaction (rearranging where the objects live).

This whole approach is going to be orders of magnitude of overhead and the GC can’t do anything because you’d still be allocating the object, setting it up, etc. Your only hope would be the JIT seeing through this kind of insanity and rewriting to elide those objects but that’s not something I’m aware AOT optimizer can do let alone a JIT engine that needs to balance generating code over fully optimal behavior.

Don’t take my word for it - write a simple benchmark to illustrate the problem. You can also look throughout the comment thread that OP is just completely combative with people who clearly know something and point out problems with his reasoning.

[softfalcon]

Thanks for this. I was feeling similarly reading the original post.

I was trying to keep an open mind, it's easy to be wrong with all that's going on in the industry right now.

Thanks for clarifying some of the details back to what I was originally thinking.

[conartist6]

Even if you stop the world while you sweep the infant generation, the whole point of the infant generation is that it's tiny. Most of the memory in use is going to be in the other generations and isn't going to be swept at all: the churn will be limited to the infant generation. That's why in real usage the GC overhead is I would say around 15% (and why the collections are spaced regularly and quick enough to not be noticeable).