Our recent post about the merits of accurate garbage collection over reference counting prompted Tezka to ask for measurements demonstrating the performance differences between an accurate GC and the reference counted shared_ptr smart pointers provided by the Boost C++ library. The benchmarks we have been using to prototype allocators for our HLVM project provide the perfect setting for such an experiment. We already have C++ code that solves the n-queens problem using logic programming with a variety of different allocation strategies. Adding another version of our benchmark using Boost's shared_ptr gave the following remarkable results:
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