thread_local.PerformanceTest/Main.cpp at master · EmuraDaisuke/thread_local.PerformanceTest · GitHub

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#include    <vector>
#include    <thread>
#include    "./Lapse.h"


constexpr unsigned int nTest = 0x1000000;


struct Test {
    ~Test(){}

    Test():mp(ma){}

    char* Func(){ return mp++; }

    char ma[nTest];
    char* mp;
};

thread_local Test v;

Test& get_v(){ return v; }


void test()
{
    std::vector<std::thread> at(std::thread::hardware_concurrency());

    {   //
        Lapse l;
        for (auto& t : at) t = std::thread([=]{ for (unsigned int n = nTest; n; --n) v.Func(); });
        for (auto& t : at) t.join();
    }

    {   //
        Lapse l;
        for (auto& t : at) t = std::thread([=]{ decltype(auto) rv = get_v(); for (unsigned int n = nTest; n; --n) rv.Func(); });
        for (auto& t : at) t.join();
    }
}


int main(int argc, char* argv[])
{
    test();
    test();
    return 0;
}