数据和bss段中的数据丢失不均等

Question

为什么注释掉一个初始化的全局变量会从数据段中丢失4个字节的数据，而注释掉一个未初始化的全局变量会丢失来自BSS段的8个字节的数据？

PROGRAM1：

#include <stdio.h>

int global1 = 20; /* initialized global variable stored in DS*/
int global2;    /* Uninitialized global variables stored in BSS segment*/
int global3=0;  /* Global variables initialized to zero are stored in BSS*/
int main(void)
{
static int i = 100; /* Initialized static variable stored in DS*/
static int j=0;    /* Static variables initialized to 0 are stored in bss*/
 //int l=100;  /* stack stores the auto variables*/      
 int k;      /* stack stores the auto variables*/   
 return 0;
}

数据：504 BSS 32

程序2：

#include <stdio.h>
//int global1 = 20; /* initialized global variable stored in DS*/
int global2;    /* Uninitialized global variables stored in BSS segment*/
int global3=0;  /* Global variables initialized to zero are stored in BSS  segment*/
int main(void)
{
static int i = 100; /* Initialized static variable stored in DS*/
static int j=0;    /* Static variables initialized to 0 are stored in BSS  segment*/
 //int l=100;  /* stack stores the auto variables*/      
 int k;      /* stack stores the auto variables*/ 
return 0;
}

数据：500，BSS 32

节目3：

#include <stdio.h>
//int global1 = 20; /* initialized global variable stored in DS*/
//int global2;    /* Uninitialized global variables stored in BSS segment*/
int global3=0;  /* Global variables initialized to zero are stored in BSS  segment*/
int main(void)
{
static int i = 100; /* Initialized static variable stored in DS*/
static int j=0;    /* Static variables initialized to 0 are stored in BSS segment*/
 //int l=100;  /* stack stores the auto variables*/      
 int k;      /* stack stores the auto variables*/ 
 return 0;

 }

数据500，BSS 24（为什么24，为什么不是28？）