Are your data files binary or text? Can you show us a small sample input file?

Update: I see by your code now that the files are text. Is it possible that they have such long lines that the read via the diamond oprator is taking a huge chunk of memory?

Update 2: Duh, I'm still asleep--please forgive my incoherent rambling about things I failed to notice in the OP.

In reply to Re: Alternate for "open" by u65
in thread Alternate for "open" by ravi45722

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