[swift-dev] Performance issues in automatic reference counting (ARC)?

Brian Gesiak modocache at gmail.com
Sat Dec 17 13:13:55 CST 2016

Hello all!

I really enjoyed Chris Lattner's slides from his talk at IBM <

The speaker notes mention ARC:

"There are two principle downsides to ARC that people cite: one is the need
for atomic increment/decrements, which can be slow." [...] "The performance
problems it can cause are real in some important cases"

Can someone point me to a good resource that explains these problems? I
guess atomic reference count changes create overhead in multithreaded
applications? Are there more detailed explorations into this topic?


- Brian Gesiak
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