我的基于C的程序崩溃，分配了太多内存

Question

I'm reading a text file with coordinates and values and building an NxM table. The problem is that there is a 10^5 x 10^5 file, and I'm allocating space for this huge table. The program won't run - it just stops. Is there any way more efficient to allocate this space, or save values in a different way?

My program runs fine until the file is too big.

Answer 1

Use mmap Memory mapping and file I/O

Anytime you are reading a binary file and not intending to extend it, mmap is almost always a better option.