The following is the serial version for comparison.

#!/usr/bin/env perl

use strict;
use warnings;

# --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
package main;

use Excel::Writer::XLSX;

my ($nodeList, $wb, $center, $format);

$nodeList = [ [ 'AMS' , 'a' ], [ 'APJ' , 'ap' ], [ 'EMEA', 'e' ] ];
$wb = Excel::Writer::XLSX->new("Node_List.xlsx");

# Set workbook properties
$wb->set_properties(
   title    => 'Node List',
   author   => 'L_WC demo',
   comments => 'Node List',
);

# Define/add formats to the workbook
$center = $wb->add_format(align => 'center');
$format = $wb->add_format(align => 'center', bg_color => 44);

# Add worksheets, specify formats for columns/rows
for (0 .. @{ $nodeList } - 1) {
   $wb->add_worksheet($nodeList->[$_][0]);
   $wb->sheets($_)->set_column(0, 4, 15, $center);
}

# Run
foreach (@{ $nodeList }) {
   doSomething($_->[0], $_->[1]);
}

$wb->close();

print "Node List is Done.\n";

# --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
sub doSomething {
   my ($region, $sql) = @_;
   my $ws;

   # Acquire data from the DB


   # Fill worksheet rows/cells
   if ($region eq 'AMS') {
      $ws = $wb->sheets(0);
      $ws->write(0, 2, 'foo', $format);
      for ( 1 .. 111_111 ) {
         $ws->write(0 + $_, 0, 1000 + $_);
         $ws->write(1 + $_, 2, 2000 + $_);
         $ws->write(2 + $_, 4, 3000 + $_);
      }
      print "AMS  ---- DONE.\n";
   }
   elsif ($region eq 'APJ') {
      $ws = $wb->sheets(1);
      $ws->write(0, 2, 'bar', $format);
      for ( 1 .. 111_111 ) {
         $ws->write(0 + $_, 0, 4000 + $_);
         $ws->write(1 + $_, 2, 5000 + $_);
         $ws->write(2 + $_, 4, 6000 + $_);
      }
      print "APJ  ---- DONE.\n";
   }
   elsif ($region eq 'EMEA') {
      $ws = $wb->sheets(2);
      $ws->write(0, 2, 'baz', $format);
      for ( 1 .. 111_111 ) {
         $ws->write(0 + $_, 0, 7000 + $_);
         $ws->write(1 + $_, 2, 8000 + $_);
         $ws->write(2 + $_, 4, 9000 + $_);
      }
      print "EMEA ---- DONE.\n";
   }

   return;
}
[download]

Kind regards, Mario

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