The following provides a demonstration. Notice how workers populate a local array before sending to the manager process using one gather call. This is one way to minimize IPC overhead.

use strict;
use warnings;

use MCE::Loop;
use MCE::Candy;

my $count  = 0;
my $input  = [ ];
my $output = [ ];

my $sample = { a => ++$count, b => ++$count, c => ++$count };

push @{ $input }, $sample for ( 1 .. 100000 );

MCE::Loop::init(
   max_workers => 3,
   chunk_size  => 100,
   gather      => MCE::Candy::out_iter_array( $output )
);

mce_loop {
   my ( $mce, $chunk_ref, $chunk_id ) = @_;
   my @ret;

   for my $h ( @{ $chunk_ref } ) {
      push @ret, {
         a => $h->{a} * 2,
         b => $h->{b} * 2,
         c => $h->{c} * 2,
      };
   }

   MCE->gather($chunk_id, @ret);

} $input;

MCE::Loop::finish();

print scalar(@{ $output }), "\n";

[download]

Regards, Mario.

In reply to Re^2: MCE -- how to know which function to use by marioroy
in thread MCE -- how to know which function to use by 1nickt

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.