c++ - 如何以编程方式检测进程在堆上分配的字节数？

Question

如何以编程方式检测进程在堆上分配的字节数？这个测试应该从流程本身开始。

Answer 1

我认为 mallinfo() 是您想要的:

#include <malloc.h>


struct mallinfo *info;

info = mallinfo();

printf ("total allocated space:  %llu bytes\n", info->uordblks);
printf ("total free space:       %llu bytes\n", info->fordblks);

struct mallinfo 结构是技术性的，特定于 malloc() 实现。但是你想要的信息就在那里。以下是我报告这些值的方式:

mallinfo.arena = "Total Size (bytes)" 
mallinfo.uordblks = "Busy size (bytes)" 
mallinfo.fordblks = "Free size (bytes)" 
mallinfo.ordblks = "Free blocks (count)" 
mallinfo.keepcost = "Top block size (bytes)" 
mallinfo.hblks = "Blocks mapped via mmap() (count)" 
mallinfo.hblkhd = "Bytes mapped via mmap() (bytes)"

这两个据称未被使用，但它们似乎在我的系统上发生了变化，因此可能是有效的:

mallinfo.smblks = "Fast bin blocks (count)"
mallinfo.fsmblks = "Fast bin bytes (bytes)"

另一个有趣的值是由“sbrk(0)”返回的