hi monks ,

why is this procedure so slow:

--first_program.pl--


use strict;
#use warnings;

open (F, "<", "test.out");

while(<F>){
  print "$_";
}


-- second program--

use strict;
use warnings;


my $name = '';
my @id_list;
open (STDIN,"perl first_program.pl|") || die "$!";
open (OUT, ">", "out.txt") || die "$!";
# chomp std line in
while(my $line_in =<STDIN>){
chomp($line_in);
  my @line_array = split('\t',$line_in);
  my @subline_array = split('\|', $line_array[1]);
  @id_list = () unless ($name eq $line_array[0]); 
  $name = $line_array[0] unless ($name eq $line_array[0]);  
  next if (grep{$_ == $subline_array[3]}@id_list);
  push(@id_list,$subline_array[3]);        
  print OUT "$line_in\n";
}
[download]

so what i'm doing is starting the second program that starts the first one , takes its stdout and parses its results to a file: the line that first one reads looks like:

mmenr hh|gg|kk|3445|uu|zzz 234 wwe we qw 233
[download]

without parsing the procedure takes only 3 min (but i'm writing the lines of test directly into the file not stdout) and with parsing it it takes something like 2h

is there a way to speed this up?

thnx

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