benchmark.cpp

#include <ctime>
#include <cstdio>
#include "flecs.h"
#include "inttypes.h"

auto nanos() {
    timespec Time;
    clock_gettime(CLOCK_MONOTONIC, &Time);
    return Time.tv_sec * int64_t{1000000000} + (int64_t)Time.tv_nsec;
}

int main() {
 
  struct Comp1 {
        int field1;
        int field2;
    };

    struct Comp2 {
        int field1;
        int field2;
    };

    struct Comp3 {
        int field1;
        int field2;
    };

    float Baseline;

    {
        // Warm-up
        flecs::world ECS;
        ECS.progress();

        auto Start = nanos();
        ECS.progress();
        auto End = nanos();
        Baseline = (End - Start) / 1000000000.0f;
    }

    {
        flecs::world ECS;

        int Count = 0;

        ECS.system<Comp1, Comp2, Comp3>().iter([&](flecs::iter &Iter) {
            for (auto Index : Iter) {
                auto Entity = Iter.entity(Index);
                (void)Entity;
                ++Count;
            }
        });

        for (int Index = 0; Index < 12800; ++Index) {
            ECS.entity().add<Comp1>().add<Comp2>().add<Comp3>();
        }

        ECS.progress();
        auto Start = nanos();
        ECS.progress();
        auto End = nanos();
        printf("test 1 took %.3fms\n", ((End - Start) / 1000000000.0f - Baseline) * 1000.0f);
    }

    {
        flecs::world ECS;

        int Count = 0;

        ECS.system<Comp1, Comp2, Comp3>().iter([&](flecs::iter &Iter) {
            for (auto Index : Iter) {
                auto Entity = Iter.entity(Index);
                (void)Entity;
                ++Count;
            }
        });

        for (int Index = 0; Index < 12800; ++Index) {
            auto Parent = ECS.entity();
            ECS.scope(Parent, [&]() { ECS.entity().add<Comp1>().add<Comp2>().add<Comp3>(); });
        }

        ECS.progress();
        auto Start = nanos();
        ECS.progress();
        auto End = nanos();
        printf("test 2 took %.3fms\n",  ((End - Start) / 1000000000.0f - Baseline) * 1000.0f);
    }
  
  return 0;
}

Output @HEAD aka aa3d0df9:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.036ms
test 2 took 4.527ms

Output @HEAD~100:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.038ms
test 2 took 4.207ms

Output @HEAD~200:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.033ms
test 2 took 5.887ms
    
Output @HEAD~225:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.040ms
test 2 took 5.132ms
    
Output @HEAD~230:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.034ms
test 2 took 5.427ms
    
Output @HEAD~232:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.037ms
test 2 took 5.620ms
    
Output @HEAD~233:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.010ms
test 2 took 0.356ms
    
Output @HEAD~235:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.010ms
test 2 took 0.345ms

Output @HEAD~250:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.011ms
test 2 took 0.388ms
    
Output @HEAD~300:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.023ms
test 2 took 0.375ms
    
Output @HEAD~800:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.013ms
test 2 took 0.656ms
        
Output @HEAD~1000:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.016ms
test 2 took 0.130ms
    
Output @HEAD~1100:
/home/sasha/flecs_test/cmake-build-release/SECore
test 1 took 0.013ms
test 2 took 0.201ms