eventpp/doc/benchmark.md

Benchmarks

CallbackList invoking VS native function invoking

Hardware: Intel(R) Xeon(R) CPU E3-1225 V2 @ 3.20GHz
Software: Windows 10, MSVC 2017, MinGW GCC 7.2.0
Iterations: 100,100,100
Time unit: milliseconds

Function	Compiler	Native invoking	CallbackList single threading	CallbackList multi threading
Inline global function	MSVC 2017	217	1501	6921
	GCC 7.2	187	1489	4463
Non-inline global function	MSVC 2017	241	1526	6544
	GCC 7.2	233	1488	4787
Function object	MSVC 2017	194	1498	6433
	GCC 7.2	212	1485	4951
Member virtual function	MSVC 2017	207	1533	6558
	GCC 7.2	212	1485	4489
Member non-virtual function	MSVC 2017	214	1533	6390
	GCC 7.2	211	1486	4872
Member non-inline virtual function	MSVC 2017	206	1522	6578
	GCC 7.2	182	1666	4593
Member non-inline non-virtual function	MSVC 2017	206	1491	6992
	GCC 7.2	205	1486	4490
All functions	MSVC 2017	1374	10951	29973
	GCC 7.2	1223	9770	22958

Testing functions

#if defined(_MSC_VER)
#define NON_INLINE __declspec(noinline)
#else
// gcc
#define NON_INLINE __attribute__((noinline))
#endif

volatile int globalValue = 0;

void globalFunction(int a, const int b)
{
	globalValue += a + b;
}

NON_INLINE void nonInlineGlobalFunction(int a, const int b)
{
	globalValue += a + b;
}

struct FunctionObject
{
	void operator() (int a, const int b)
	{
		globalValue += a + b;
	}

	virtual void virFunc(int a, const int b)
	{
		globalValue += a + b;
	}

	void nonVirFunc(int a, const int b)
	{
		globalValue += a + b;
	}

	NON_INLINE virtual void nonInlineVirFunc(int a, const int b)
	{
		globalValue += a + b;
	}

	NON_INLINE void nonInlineNonVirFunc(int a, const int b)
	{
		globalValue += a + b;
	}
};

#undef NON_INLINE