Yangqing Jia 1ef99cf0ab Intrusive_ptr implementation slower than shared_ptr (#30810) ... Summary: It was a random coding exercise so I wasn't putting much effort into it; but, I was like "hey is the current intrusive_ptr implementation optimized enough?" so I compared it with shared_ptr (using std::shared_from_this). My benchmark result shows that intrusive_ptr is actually slower. On my macbook the speed is: ``` --------------------------------------------------------------- Benchmark Time CPU Iterations --------------------------------------------------------------- BM_IntrusivePtrCtorDtor 14 ns 14 ns 52541902 BM_SharedPtrCtorDtor 10 ns 10 ns 71898849 BM_IntrusivePtrArray 14285 ns 14112 ns 49775 BM_SharedPtrArray 13821 ns 13384 ns 51602 ``` Wanted to share the results so someone could probably take a look if interested. Pull Request resolved: https://github.com/pytorch/pytorch/pull/30810 Reviewed By: yinghai Differential Revision: D18828785 Pulled By: bddppq fbshipit-source-id: 202e9849c9d8a3da17edbe568572a74bb70cb6c5		2019-12-13 00:25:36 -08:00
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CMakeLists.txt	Intrusive_ptr implementation slower than shared_ptr (#30810)	2019-12-13 00:25:36 -08:00
intrusive_ptr_benchmark.cpp	Intrusive_ptr implementation slower than shared_ptr (#30810)	2019-12-13 00:25:36 -08:00