cpu 72389 2891 16811 1148664 31374 0 67 0 0 0
cpu0 17608 452 3786 288899 6210 0 30 0 0 0
cpu1 18724 926 4598 285844 8911 0 15 0 0 0
cpu2 16803 658 3726 288710 7220 0 7 0 0 0
cpu3 19254 855 4700 285209 9032 0 13 0 0 0
...
...
...

MemTotal: 4046236 kB
MemFree:  1054440 kB
MemAvailable: 2460060 kB
Buffers:  359688 kB
Cached:  1158056 kB
SwapCached:  0 kB
Active:  2020096 kB
Inactive:  677948 kB
Active(anon): 1181376 kB

...
...
...

2476 (firefox) S 1773 1910 1910 0 -1 4210688 3413511 1712 757 1 45466 4629 2 7 20 0 57 0 20381 1774743552 150565 18446744073709551615 94844693012480 94844693126372 140732961864784 140732961858304 139747170914269 0 0 4096 33572079 0 0 0 17 2 0 0 1178 0 0 94844695226592 94844695228536 94844713955328 140732961867643 140732961867668 140732961867668 140732961869791 0

Name: firefox
State: S (sleeping)
Tgid: 2476
Ngid: 0
Pid: 2476
PPid: 1773
TracerPid: 0
Uid: 1000 1000 1000 1000
Gid: 1000 1000 1000 1000
FDSize: 256
Groups: 4 24 27 30 46 108 124 1000 
NStgid: 2476
NSpid: 2476
NSpgid: 1910
NSsid: 1910
VmPeak: 1722812 kB
VmSize: 1690920 kB
VmLck:   0 kB
VmPin:   0 kB
VmHWM: 684048 kB
VmRSS: 600324 kB
VmData: 993040 kB
VmStk:  192 kB
...
...
...

//get_mem.h
#include <stdlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h> 
#include <assert.h>
#define VMRSS_LINE 21//VMRSS所在行, 注:根据不同的系统,位置可能有所区别.
#define pid_t int
int get_phy_mem(const pid_t p)
{
 char file[64] = {0};//文件名
 FILE *fd;   //定义文件指针fd
 char line_buff[256] = {0}; //读取行的缓冲区
 sprintf(file,"/proc/%d/status",p);
 fprintf (stderr, "current pid:%d\n", p);
 fd = fopen (file, "r"); //以R读的方式打开文件再赋给指针fd
 //获取vmrss:实际物理内存占用
 int i;
 char name[32];//存放项目名称
 int vmrss;//存放内存
 //读取VmRSS这一行的数据
 for (i=0;i<VMRSS_LINE-1;i++)
 {
  char* ret = fgets (line_buff, sizeof(line_buff), fd);
 }
 char* ret1 = fgets (line_buff, sizeof(line_buff), fd);
 sscanf (line_buff, "%s %d", name,&vmrss);
 fprintf (stderr, "====%s：%d====\n", name,vmrss);
 fclose(fd);  //关闭文件fd
 return vmrss;
}
int get_rmem(pid_t p)
{
 return get_phy_mem(p);
}
int get_total_mem()
{
 const char* file = "/proc/meminfo";//文件名
 FILE *fd;   //定义文件指针fd
 char line_buff[256] = {0}; //读取行的缓冲区
 fd = fopen (file, "r"); //以R读的方式打开文件再赋给指针fd
 //获取memtotal:总内存占用大小
 int i;
 char name[32];//存放项目名称
 int memtotal;//存放内存峰值大小
 char*ret = fgets (line_buff, sizeof(line_buff), fd);//读取memtotal这一行的数据,memtotal在第1行
 sscanf (line_buff, "%s %d", name,&memtotal);
 fprintf (stderr, "====%s：%d====\n", name,memtotal);
 fclose(fd);  //关闭文件fd
 return memtotal;
}

#include "get_mem.h"
int main()
{
int list[1024];
for(int i = 0; i < 1024; i++)
 list[i] = i;
int mem = get_rmem(getpid());

}