Hello John FENDER,

The following is a parallel demonstration using MCE::Flow and MCE::Shared.

use strict;
use warnings;

use MCE::Flow;
use MCE::Shared;

open my $fh, "unzip -p 10-million-combos.zip |" or die "$!";

my $counter1 = MCE::Shared->scalar( 0 );
my $counter2 = MCE::Shared->scalar( 0 );

mce_flow {
   chunk_size => '1m', max_workers => 8,
   use_slurpio => 1,
},
sub {
   my ( $mce, $chunk_ref, $chunk_id ) = @_;
   my ( $numlines, $occurances ) = ( 0, 0 );

   while ( $$chunk_ref =~ /([^\n]+\n)/mg ) {
      $numlines++;
      $occurances++ if ( $1 =~ /123456\r/ );
   }

   $counter1->incrby( $numlines   );
   $counter2->incrby( $occurances );

}, $fh;

close $fh;

print "Num lines : ", $counter1->get(), "\n";
print "Occurances: ", $counter2->get(), "\n";

[download]

The following construction reads the plain text file directly if already unzipped.

use strict;
use warnings;

use MCE::Flow;
use MCE::Shared;

my $counter1 = MCE::Shared->scalar( 0 );
my $counter2 = MCE::Shared->scalar( 0 );

mce_flow_f {
   chunk_size => '1m', max_workers => 8,
   use_slurpio => 1,
},
sub {
   my ( $mce, $chunk_ref, $chunk_id ) = @_;
   my ( $numlines, $occurances ) = ( 0, 0 );

   while ( $$chunk_ref =~ /([^\n]+\n)/mg ) {
      $numlines++;
      $occurances++ if ( $1 =~ /123456\r/ );
   }

   $counter1->incrby( $numlines   );
   $counter2->incrby( $occurances );

}, "10-million-combos.txt";

print "Num lines : ", $counter1->get(), "\n";
print "Occurances: ", $counter2->get(), "\n";

[download]

In reply to Re: How to optimize a regex on a large file read line by line ? by marioroy
in thread How to optimize a regex on a large file read line by line ? by John FENDER

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