So, an important design goal of durable objects is that it should scale to extremely large numbers o
So, an important design goal of durable objects is that it should scale to extremely large numbers of fine-grained objects. We strongly encourage developers to design for finer granularity, and we intentionally don't bill on the number of objects because we'd rather see people building apps around more, smaller objects.
If we said that each object gets its own isolate, that would unfortunately blow up this goal, since even though isolates are much cheaper than containers, they are still much more expensive than what we'd like to see for fine-grained objects.
What we really want to be able to do is adaptively adjust the isolate count to match what the app needs, so apps don't need to worry about it. We're still working on that, though, and it's a lot harder for large / coarse-grained objects compared to fine-grained.
If we said that each object gets its own isolate, that would unfortunately blow up this goal, since even though isolates are much cheaper than containers, they are still much more expensive than what we'd like to see for fine-grained objects.
What we really want to be able to do is adaptively adjust the isolate count to match what the app needs, so apps don't need to worry about it. We're still working on that, though, and it's a lot harder for large / coarse-grained objects compared to fine-grained.
