Hello brothers and sisters of the Monastery,
Seeing danaj's post made me think of passing arguments to workers for a parallel demonstration. But first, I need to check if random numbers are unique between workers. They are not for non-threaded workers, irand64 and random_bytes.
Here is the test code. Calling MCE::relay is a way to have workers display output orderly, starting with worker 1, 2, ..., 8. The init_relay value isn't used here, but the option tells MCE to load MCE::Relay and enable relay capability. Workers persist between each run.
use strict;
use warnings;
use ntheory ":all";
use MCE::Flow;
my ( $name, $rng );
my %rand = (
"drand48" => sub { int(rand(1 << 32)) },
"ChaCha20" => sub { irand64() },
"/dev/urandom" => sub { unpack("Q", random_bytes(8)) }
);
MCE::Flow::init(
max_workers => 8,
init_relay => 0,
user_begin => sub {
$name = MCE->user_args()->[0];
$rng = $rand{ $name };
}
);
sub func {
MCE::relay {
print MCE->wid(), ": ", $rng->(), "\n";
};
}
for my $name ( "drand48", "ChaCha20", "/dev/urandom" ) {
print "Usage $name:\n";
mce_flow { user_args => [$name] }, \&func;
print "\n";
}
Output.
Usage drand48:
1: 3498494761
2: 2506930441
3: 1515366121
4: 523801801
5: 3827204777
6: 2835640457
7: 1844076137
8: 852511817
Usage ChaCha20:
1: 4471005142860083063
2: 4471005142860083063
3: 4471005142860083063
4: 4471005142860083063
5: 4471005142860083063
6: 4471005142860083063
7: 4471005142860083063
8: 4471005142860083063
Usage /dev/urandom:
1: 15746895497052787399
2: 15746895497052787399
3: 15746895497052787399
4: 15746895497052787399
5: 15746895497052787399
6: 15746895497052787399
7: 15746895497052787399
8: 15746895497052787399
Later today will release MCE 1.831 and MCE::Shared 1.832 containing the fix.
Usage drand48:
1: 600074529
2: 3903477505
3: 2911913185
4: 1920348865
5: 928784545
6: 4232187521
7: 3240623201
8: 2249058881
Usage ChaCha20:
1: 8740887910466299010
2: 12948789762855324085
3: 7574729187958724006
4: 14608687740989597345
5: 10145950054018120246
6: 11767641523694169551
7: 5811941457879652367
8: 2397613489984096139
Usage /dev/urandom:
1: 14391656456731294109
2: 2750708286643159769
3: 10844675827853246458
4: 7920672879166021322
5: 16939013845838223421
6: 9482848646152826462
7: 11535629003375292447
8: 6903845178044907896
Once the release hits CPAN, I'd come back and post a parallel demonstration.
Regards, Mario
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