TADM2E 4.43
From Algorithm Wiki
Sort the first 2MB of it, and save to disk. Continue doing so until it is all sorted into sub arrays. Then use merge sort to combine sub arrays, only loading necessary data into memory.
Sort the first 2MB of it, and save to disk. Continue doing so until it is all sorted into sub arrays. Then use merge sort to combine sub arrays, only loading necessary data into memory.