As you can see from BrowserUk response to my previous post, it seems that in practice, the sort solution has better performance than the DB_File based one. I guess it's due to the sorting algorithm being more cache friendly (where cache = RAM).

Anyway, answering your question: yes, you can have several processes running the code in my post at the same time, though, it would probably be slower than running them in sequence.

In reply to Re^3: Saving an array to a disk file by salva
in thread Saving an array to a disk file by Anonymous Monk

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