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#!/usr/bin/perl -w
# The script calculates primes using Arch::SharedCache package.
# It creates multiple processes that all modify the same cache.
# Some quirks are created on purpose to fully test the package.
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::SharedCache");
my $dir_name = "/tmp/shared-primes-2-$$";
my $shared_index = Arch::SharedCache->new(
max_size => $max_prime,
can_create => 1,
dir => $dir_name,
);
is(ref($shared_index), 'Arch::SharedCache', "create cache to calculate primes");
# populate the index with all candidates (value 1 means prime)
$shared_index->store(map { $_ => 0 } 2 .. $max_prime);
$shared_index->store(map { $_ => 1 } 2 .. $max_prime);
for (my $num = 3; $num <= $max_multiplier; $num += 2) {
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 / $num);
# delete all *5 numbers from the index
if ($num == 5) {
$shared_index->filter(sub { $multiples{$_[0]} });
exit 0;
}
$shared_index->update(0, 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 = $shared_index->values;
my @values2 = $shared_index->fetch(@keys);
my @primes = sort { $a <=> $b } $shared_index->grep;
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, $primes_str;
}
system("/bin/rm -rf '$dir_name'");
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