Re: [Boost-users] [serialization] Runtime overhead of serialization archives

Am 21.09.2016 um 19:36 schrieb Bjorn Reese:

On 09/21/2016 06:35 PM, Georg Gast wrote:

...

Now i can see bigger differences, but its still slower much than cstyle.

The Boost archives use iostreams, whereas cstyle uses memcpy.

Yes, thats clear. :) After watching "CppCon 2015: Chandler Carruth "Tuning C++: Benchmarks, and CPUs, and Compilers! Oh My!" [1] i used on linux the google/benchmark [2] library to measure more precise. [1] https://www.youtube.com/watch?v=nXaxk27zwlk [2] https://github.com/google/benchmark This seems to be much better to judge the performance. I let each test run for at least 10 seconds. ----------------------------------------------------- Linux x64 gcc 6.1.1 Benchmark Time(ns) CPU(ns) Iterations ------------------------------------------------- to_wire_xml 16073 16072 872818 to_wire_text 14413 14409 997151 to_wire_binary 10384 10520 1268116 to_wire_cstyle 218 218 63405797 from_wire_xml 32202 32209 434783 from_wire_text 13322 13320 1023392 from_wire_binary 9906 9906 1402806 from_wire_cstyle 210 210 66666667 ----------------------------------------------------- ----------------------------------------------------- Win 10 x64 MSVC 2015 Benchmark Time(ns) CPU(ns) Iterations ------------------------------------------------- to_wire_xml 84145 84027 173308 to_wire_text 54691 54751 250279 to_wire_binary 44086 44028 315493 to_wire_cstyle 110 110 126197183 from_wire_xml 97023 96801 143820 from_wire_text 51315 51250 273171 from_wire_binary 43359 43408 320000 from_wire_cstyle 103 103 135757576 ----------------------------------------------------- My opinion: gcc is better at optimizing.... This must be the reason why windows is slower at the archives. ----------------------------------------------------- The code ----------------------------------------------------- static void to_wire_xml(benchmark::State& state) { while (state.KeepRunning()) { boost_test::to_wire(ev_test()); } } BENCHMARK(to_wire_xml); static void to_wire_text(benchmark::State& state) { while (state.KeepRunning()) { boost_test::to_wire(ev_test()); } } BENCHMARK(to_wire_text); static void to_wire_binary(benchmark::State& state) { while (state.KeepRunning()) { boost_test::to_wire(ev_test()); } } BENCHMARK(to_wire_binary); static void to_wire_cstyle(benchmark::State& state) { while (state.KeepRunning()) { cstyle_test::to_wire(ev_test()); } } BENCHMARK(to_wire_cstyle); static void from_wire_xml(benchmark::State& state) { auto buffer = boost_test::to_wire(ev_test()); while (state.KeepRunning()) { boost_test::from_wire(buffer); } } BENCHMARK(from_wire_xml); static void from_wire_text(benchmark::State& state) { auto buffer = boost_test::to_wire(ev_test()); while (state.KeepRunning()) { boost_test::from_wire(buffer); } } BENCHMARK(from_wire_text); static void from_wire_binary(benchmark::State& state) { auto buffer = boost_test::to_wire(ev_test()); while (state.KeepRunning()) { boost_test::from_wire(buffer); } } BENCHMARK(from_wire_binary); static void from_wire_cstyle(benchmark::State& state) { auto buffer = cstyle_test::to_wire(ev_test()); while (state.KeepRunning()) { cstyle_test::from_wire(buffer); } } BENCHMARK(from_wire_cstyle); -- pgp key: 0x702C5BFC Fingerprint: 267F DC06 7F96 3375 969A 9EE6 8E37 7CF4 702C 5BFC