File Coverage

tests/shared-primes-3

Criterion	Covered	Total	%
statement	71	75	94.6
branch	11	14	78.5
condition	1	2	50.0
subroutine	8	8	100.0
pod			n/a
total	91	99	91.9

#!/usr/bin/perl -w

# The script calculates primes using Arch::SharedIndex package.
# It creates multiple processes that all modify the same index.
# This version uses perl_data serialization and builds lists of divisors.

use FindBin qw($Bin);
use lib "$Bin/../perllib";

my $auto_test = !@ARGV;
my $max_multiplier = shift || 10;
my $max_prime = $max_multiplier * $max_multiplier;

use Test::More tests => @ARGV? 2: 9;
use_ok("Arch::SharedIndex");

my $file_name = "/tmp/shared-primes-3-$$";

sub create_shared_index () {
	return Arch::SharedIndex->new(
		max_size => $max_prime,
		can_create => 1,
		file => $file_name,
		perl_data => 1,
	);
}
my $shared_index = create_shared_index();
is(ref($shared_index), 'Arch::SharedIndex', "create index to calculate primes");

# populate the index with all candidates (value [] means prime, no divisors)
$shared_index->store(map { $_ => [] } 2 .. $max_prime);

for (my $num = 2; $num <= $max_multiplier; $num++) {
	my $is_parent = fork();
	next if $is_parent;
	die "Can't fork: $!\n" unless defined $is_parent;

	# in child, dismiss all multiples of $num
	my %multiples = map { $_ * $num => 1 } 2 .. int($max_prime / $num);
	$shared_index = create_shared_index();  # recreate for testing only

	# delete all *5 numbers from the index
	if ($num == 5) {
		$shared_index->filter(sub { $multiples{$_[0]} });
		exit 0;
	}
	$shared_index->update(
		sub { [ @{$_[1]}, $num ] }, sub { $multiples{$_[0]} });
	exit 0;
}

# delete all even numbers from the index
$shared_index->delete(map { $_ * 2 } 2 .. int($max_prime / 2));

# wait for children
while (wait() > 0) {}

my @keys = $shared_index->keys;
my @values1 = map { @$_? 0: 1 } $shared_index->values;
my @values2 = map { @$_? 0: 1 } $shared_index->fetch(@keys);
my @primes = sort { $a <=> $b } $shared_index->grep(sub { @{$_[1]} == 0 });

my $num_keys = @keys;
my $num_values1 = @values1;
my $num_values2 = @values2;
my $values1_str = join('', @values1);
my $values2_str = join('', @values2);
my $num_primes = @primes;
my $primes_str = join(', ', @primes);

if ($auto_test) {
	my $exp_num_keys = 41;
	my $exp_values_str = "11110111101011010111001011010110101010010";
	my $exp_num_primes = 25;
	my $exp_primes_str = "2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97";
	is($num_keys, $exp_num_keys, "verify num_keys (odd non *5 numbers)");
	is($num_values1, $exp_num_keys, "verify number of values (1)");
	is($values1_str, $exp_values_str, "verify values (1)");
	is($num_values1, $exp_num_keys, "verify number of values (2)");
	is($values2_str, $exp_values_str, "verify values (2)");
	is($num_primes, $exp_num_primes, "verify number of primes");
	is($primes_str, $exp_primes_str, "verify primes");
} else {
	printf "Number of keys (odd non *5 numbers): %d\n", $num_keys;
	printf "Values (1-st): %d - %s\n", $num_values1, $values1_str;
	printf "Values (2-nd): %d - %s\n", $num_values2, $values2_str;
	printf "Primes: %d - %s\n", $num_primes, $primes_str;
}

unlink($file_name);