本文介绍了的malloc分配内存比RAM更的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我只是执行的，在一个12 MB的计算机mallocs 13 MB的程序（QEMU模拟！）。不仅如此，我甚至通过记忆浏览，并在其中填满垃圾......
I just executed a program that mallocs 13 MB in a 12 MB machine (QEMU Emulated!) . Not just that, i even browsed through the memory and filled junk in it...
void
large_mem(void)
{
#define LONGMEM 13631488
long long *ptr = (long long *)malloc(LONGMEM);
long long i;
if(!ptr) {
printf("%s(): array allocation of size %lld failed.\n",__func__,LONGMEM);
ASSERT(0);
}
for(i = 0 ; i < LONGMEM ; i++ ) {
*(ptr+i)=i;
}
free(ptr);
}
这怎么可能？我期待分段错误。
How is it possible ? I was expecting a segmentation fault.
推荐答案
这就是所谓的虚拟内存这是分配给你的程序。这不是的真正的内存，您拨打的RAM。
It's called virtual memory which is allocated for your program. It's not real memory which you call RAM.
有对虚拟内存最大限制为好，但它比RAM高。它是由你的操作系统实现（定义）。
There is a max limit for virtual memory as well, but it's higher than RAM. It's implemented (and defined) by your operating system.
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