#!/usr/bin/perl -w
use strict;
use GRID::Machine;
use GRID::Machine::Group;
use List::Util qw(sum);

my @MACHINE_NAMES = split /\s+/, ($ENV{MACHINES} || '');
@MACHINE_NAMES = ('', '') unless @MACHINE_NAMES;
my $c = GRID::Machine::Group->new(cluster => [ @MACHINE_NAMES ]);

$c->sub(suma_areas => q{
   my ($id, $N, $np) = @_;
     
   my $sum = 0;
   for (my $i = $id; $i < $N; $i += $np) {
       my $x = ($i + 0.5) / $N;
       $sum += 4 / (1 + $x * $x);
   }
   $sum /= $N; 
});

my ($N, $np, $pi)  = (1000, 4, 0);

{
  my $count = 0;
  sub next {  [$count++, $N, $np] };
  sub thereare { $count < $np };
  sub reset { $count = 0 };
}

print sum($c->suma_areas( args => { next => \&next, thereareargs => \&thereare, reset => \&reset } )->Results)."\n";