MCE-Shared 1.821

on Perl CPAN

• Updated MCE::Shared::Queue. The following provides a comparison
  for the enhancements made regarding IPC during 1.818 through 1.821,
  in order to run on machines having "many" cores. I ran with 12, 96,
  and 192 workers on an 8 core box.
  

Shared queue, dequeue 100k items.

 my $Q = MCE::Shared->queue();

 # Must start the manager manually when IO::FDPass is missing.
 # This caveat applies to Condvar, Handle, and Queue.

 MCE::Shared->start() unless $INC{'IO/FDPass.pm'};

 $Q->enqueue( 1 .. 100000 );
 $Q->end();

 MCE->new(
     max_workers => 12, 96, or 192,
     user_func   => sub {
         while ( defined ( my $item = $Q->dequeue ) ) {
             ;
         }
     }
 )->run();

MCE::Shared 1.821: 12 ~ 1.325 secs 96 ~ 5.206 secs 192 ~ 8.158 secs
MCE::Shared 1.825: ~ 0.913 secs ~ 1.068 secs ~ 1.560 secs

• Results were captured on a fast 8 core system running CentOS Linux 7.
  The thing to take from this is that running many workers "no longer"
  results in up to 6.2x penalty regarding IPC.

• When IO::FDPass is missing, croak with error if constructing a Condvar
  or Queue and forgotten to start the shared-manager process manually.

• Bumped MCE dependency to 1.825.