Here I try 10x the input size i.e. ~ 1 GB input file.

# choroba's input generator, 990 MB
# https://perlmonks.org/?node_id=11164445
# perl gen_input.pl > big

use strict;
use warnings;

for (1..100_000_000) {
  print int(rand 2)
    ? "xyzabcd" 
    : ("mul(" . int(rand 5000) . "," . int(rand 5000) . ")");
  print "\n" unless int rand 10;
}

[download]

Non-chunking consumes greater than 1 GB of memory ~ 1.1 GB. Chunking consumes significantly less ~ 10 MB.

Non-chunking: > 1 GB memory

Perl   4.395s
Found 1999533 matches.

Python 2.262s
Found 1999533 matches.

[download]

Chunking: ~ 10 MB memory

Perl   4.422s
Found 1999533 matches.

Python 2.247s
Found 1999533 matches.

[download]

In reply to Re^2: Python regex faster than Perl? - Chunking 1 GB by marioroy
in thread Python regex faster than Perl? by dave93

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