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0 pointskaba03y ago0 comments

Well, it won’t be the bottleneck itself, but it has an overhead on basically every operation, which likely won’t show up during profiling.

Also, I fail to see the advantage of RC in case of a presumably mostly immutable language - a tracing GC is even faster there due to no changes to the object graph after allocation, making a generational approach scale very well and be almost completely done in parallel.

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mbrodersen3y ago

Nope. The compiler does a full program optimisation, reducing the reference counting to an absolute minimum. There is close to zero overhead passing data around. It does not work like C++ shared_pre. shared_ptr is slow.

kaba0OP3y ago

> The compiler does a full program optimisation

That's the equivalent of an escape analysis I assume, which optimization exists for tracing GCs as well.

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