On Friday, 18 September 2015 at 19:26:27 UTC, Rory wrote:
The new GC in Go 1.5 seems interesting. What they say about is certainly interesting.


They went the way of classical GC-ed language where write barriers are used actively, allowing to make concurrent, incremental and (eventually, if not yet) generational GC. However it has a cost - pointer field updates are slower than in plain C/C++/D, and overall speed is close to Java. D tries to be like C and C++ where simple code is fast and straightforward, there are no write barriers and there will never be, without changing the language design. It means D's GC will always be dog slow - it has to stop the world and scan full heap every time. And that leads to different usage pattern where GC heap should remain small and GC allocation rate low.

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