The file is a single file and it is created once and does not change anymore. so I need to use it as a kind of dictionary! it will not be updated.
the searches are frequent. would be in the loops. so once I access my file I have source terms that I have to searh in the big file.
I've run it for few days and still is running! I even split it to small portions (less than 200 mg) and after 24 hours they are still running.