Strangely, if I strip my input file of carriage returns (s/\r//g) the file with printed lines is only 1.8% the size of the input file. This also takes about 22 seconds for the OOM after the start of the push @arr2 loop. Too weird.

EDIT: I now do not think the carriage returns had anything to do with the file size. I've rerun the original file and the number of printed lines vary each time and are usually less than the input file. The first time I ran it the output happened to be 10x larger than the input but I haven't been able to reproduce this.

In reply to Re^4: RE on lines read from in-memory scalar is very slow (OOM variant) by Danny
in thread RE on lines read from in-memory scalar is very slow by Danny

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