cache 内存消耗, C++ (gcc)

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//g++  5.4.0

#include <iostream>
#include <string>
#include <memory>
 #include <stddef.h>

using namespace std;
#define MEMB_SIZE(t,m)      (sizeof(((t*)0)->m))
class A {
public:
    A() {};
    virtual ~A() {};
    int a;
    int b;
    uint64_t c;
};

class Node {
 public:
    uint64_t* prev;
    uint64_t* next;
    uint64_t* list;
};

class Base {
    public:
    Base() {std::cout << "base cons" << std::endl;};
    ~Base() {std::cout << " base des" << std::endl;};
    uint64_t* a;
    uint64_t* b;
    uint64_t e;
    uint32_t c;
    uint8_t f;
    enum CacheState : uint8_t { NONE, INACTIVE, ACTIVE, WRITING_BACK, ACCESSED_AFTER_WRITING_BACK, CLEAN};
    CacheState stat;
};

class B : public Base {
    public:
    B() {std::cout << "b cons" << std::endl;};
    ~B() {std::cout << " b des" << std::endl;};
    class NodeCtx {
       public:
        ~NodeCtx() {std::cout << " NodeCtx des" << std::endl;};
        Node node;
    };
    NodeCtx g;
};

enum CacheEnum : uint8_t {
    NONE, INACTIVE, ACTIVE, WRITING_BACK, ACCESSED_AFTER_WRITING_BACK, CLEAN};
int main()
{
    //std::cout << offsetof(A, a) << " " << offsetof(A, b) << " " << offsetof(A, c);
    std::cout << " B " << sizeof(B) << " " << offsetof(B, g) << " " << sizeof(CacheEnum) << std::endl;
    std::cout << " base " << sizeof(Base) << " " << offsetof(B, g) << " " << sizeof(CacheEnum);
    Base *a= new B();
    delete a;
    
}

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Compilation time: 0.53 sec, absolute running time: 0.1 sec, cpu time: 0.03 sec, memory peak: 3 Mb, absolute service time: 0,65 sec