There is a quick test to see if your perl binary supports large files -V:uselargefiles should return this if it does: 
> perl -V:uselargefiles
uselargefiles='define';

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If it doesn't, IMO the best way to fix your problem is to get/compile a new perl interpreter with large file support (this should be the default in recent perl versions)

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^3: Parsing large files by Joost
in thread Parsing large files by Grundle

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