My first guess would be that with full file he get into memory swapping which is a speed killer. Rev loads all you stack data in memory after all. You can test this by setting your virtual memory to be just 1 mb over the physical RAM.Hi all, I have a 5MB file with about 550000 lines that need to be processed by a script. A simple script that deletes a line if the previous line has the same contents. That takes more than 60 hours to complete. So I thought I divide the file into smaller files of about one 60th of the total number of lines. But instead of the expected hour of processing time, it took 2 minutes for each file to complete.I understand processes are faster with less data in memory, but I never would have thought the difference would be this big. Any thoughts on how this is possible and what we can learn from it when making programs? Terry
Robert
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