I had always wanted to share a solution using MCE which comes with a sequence generator. This allows one to use a pool of workers seamlessly while iterating through a sequence of numbers.
The first example is a modified version of the demonstration by BrowserUk.
use strict;
use threads;
use threads::shared;
use MCE::Flow;
use Math::BigInt;
use feature qw(say);
my %result : shared;
mce_flow_s { chunk_size => 1, max_workers => 4 }, \&process, 1, 1000;
for my $key ( sort{ $a <=> $b } keys %result ) {
say "$key => ", $result{ $key }->bstr;
}
sub process {
my $number = $_;
my $factorial = factorial($number);
$result{$number} = shared_clone( $factorial ); ## clone the object
}
sub factorial {
my $number = shift;
Math::BigInt->bfac($number);
}
The next example requires the upcoming MCE 1.7 release, currently residing in GitHub. Notice the use of MCE::Shared and the capital letter S in Shared for the variable attribute.
use strict;
use MCE::Flow;
use MCE::Shared;
use Math::BigInt;
use feature qw(say);
my %result : Shared;
mce_flow_s { chunk_size => 1, max_workers => 4 }, \&process, 1, 1000;
for my $key ( sort{ $a <=> $b } keys %result ) {
say "$key => ", $result{ $key }->bstr;
}
sub process {
my $number = $_;
my $factorial = factorial($number);
$result{$number} = $factorial; # the object is shared automatical
+ly
}
sub factorial {
my $number = shift;
Math::BigInt->bfac($number);
}
Both complete in the same time frame. Threads is not required to run MCE::Shared as it supports threads and processes alike. Thus, one may include threads if desired.
Init is another way to specify MCE options.
MCE::Flow::init {
chunk_size => 1,
max_workers => 4,
};
mce_flow_s \&process, 1, 1000;
Kind regards, Mario
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