util/generic/benchmark/singleton/main.cpp


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#include <library/cpp/testing/benchmark/bench.h>
 
#include <util/generic/singleton.h> 
#include <util/generic/xrange.h> 
 
char& FF1() noexcept; 
char& FF2() noexcept; 
 
namespace { 
    struct X { 
        inline X() { 
        } 
 
        char Buf[100]; 
    }; 
 
    inline X& F1() noexcept { 
        static X x; 
 
        return x; 
    } 
 
    inline X& F2() noexcept { 
        return *Singleton<X>(); 
    } 
} 
 
Y_CPU_BENCHMARK(MagicStatic, iface) { 
    for (const auto i : xrange(iface.Iterations())) { 
        Y_UNUSED(i); 
        Y_DO_NOT_OPTIMIZE_AWAY(F1().Buf); 
    } 
} 
 
Y_CPU_BENCHMARK(Singleton, iface) { 
    for (const auto i : xrange(iface.Iterations())) { 
        Y_UNUSED(i); 
        Y_DO_NOT_OPTIMIZE_AWAY(F2().Buf); 
    } 
} 
 
Y_CPU_BENCHMARK(MagicStaticNI, iface) { 
    for (const auto i : xrange(iface.Iterations())) { 
        Y_UNUSED(i); 
        Y_DO_NOT_OPTIMIZE_AWAY(FF1()); 
    } 
} 
 
Y_CPU_BENCHMARK(SingletonNI, iface) { 
    for (const auto i : xrange(iface.Iterations())) { 
        Y_UNUSED(i); 
        Y_DO_NOT_OPTIMIZE_AWAY(FF2()); 
    } 
}