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

[Brian Gesiak]

Hello all!

I really enjoyed Chris Lattner's slides from his talk at IBM <
http://researcher.watson.ibm.com/researcher/files/us-lmandel/lattner.pdf>.

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?

Thanks!

- Brian Gesiak
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