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perl Parallel::ForkManager stuck in this script?


perl Parallel::ForkManager stuck in this script?

By : Tom Lo
Date : November 19 2020, 01:01 AM
To fix the issue you can do The statements after $pm->finish are never reached when -fork > 1 is given.. You should change the order of the statements in the while loop:
code :
while (<P>) {
    $count++; 
    last if (defined $limit && $count > $limit);
    if ($fork > 1) {
        $pm->start and next;
    }
    my $file = $_; chomp $file;
    my $md5 = `md5sum $file`;
    print "$md5";
    $pm->finish if ($fork > 1);
};


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how to install parallel-forkmanager in perl

how to install parallel-forkmanager in perl


By : Sebastien Tual
Date : March 29 2020, 07:55 AM
it helps some times I am tiring to run multiple jobs in parallel by using perl script which use parallel:ForkManager. , Just use
code :
cpan Parallel::ForkManager
tar xvzf Parallel-ForkManager-1.03.tar.gz
cd Parallel-ForkManager-1.03
perl Makefile.PL && make test && make install
How to extract data from Parallel::ForkManager in perl

How to extract data from Parallel::ForkManager in perl


By : farbod hadi
Date : March 29 2020, 07:55 AM
I wish this help you You need to add run_on_finish callback to the manager instance аnd call finish method with 2 arguments into the child. So you can get second parameter of the finish call as sixth argument of the run_on_finish callback.
code :
# parent
my @arr;
$pm->run_on_finish(sub {
    push(@arr, ${$_[5]});
});

# child
my $val = 42;
$pm->finish(0, \$val);

# parent
$pm->wait_all_children();
print($_, "\n") for @arr;
How to remove Parallel::Forkmanager from my Perl script?

How to remove Parallel::Forkmanager from my Perl script?


By : user3603930
Date : March 29 2020, 07:55 AM
should help you out Parallel::Forkmanager is a parallelism option. It was probably put in to significantly accelerate this code's running, and by taking it out again - you might regret it.
However - the core part that's running in parallel is here:
code :
my $skewerFM = Parallel::ForkManager->new(46);    #this is where I do not know a solution
foreach my $skewerCommand(@skewerCommands) {
    $skewerFM->start and next;
#    print "Running the following command: \n$skewerCommand\n";
 #   system($skewerCommand);
    $skewerFM->finish;
}
$skewerFM->wait_all_children();
my $skewerFM = Parallel::ForkManager->new(46);    #this is where I do not know a solution
    $skewerFM->start and next;
    $skewerFM->finish;
$skewerFM->wait_all_children();
Which is faster in perl, Parallel::ForkManager or threads?

Which is faster in perl, Parallel::ForkManager or threads?


By : satyasarika
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Threads are considered as lightweight processes. Will they actually run faster than an equal number of forked processes? ,
Threads are considered as lightweight processes.
How to speed up Parallel::ForkManager in perl

How to speed up Parallel::ForkManager in perl


By : Dioni Spain
Date : March 29 2020, 07:55 AM
this one helps. The short answer is - we can't tell you, because it depends entirely on what 'do_stuff' is doing.
The major reasons why parallel code doesn't create linear speed increases are:
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