While your consideration is very valuable, I think it also shows that the OP's speed problem likely doesn't stem from IO, at least if his machine behaves similarly as yours.

10 lakhs = 1 million, so to be IO bound his record size would need be in the order of 1 MB. I don't know what data the OP deals with, but typical CSV files have much smaller records.

Perl 6 - second systems done right

In reply to Re^2: optimization in file processing by moritz
in thread optimization in file processing by Anonymous Monk

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