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  <div class="vevent h-event"> <h1 class="summary p-name">Portland Perl Mongers – Prime Number Generation in Perl</h1> <div class='date'><time class="dtstart dt-start" title="2012-12-13T18:53:00" datetime="2012-12-13T18:53:00">Thursday, December 13, 2012 from 6:53</time>–<time class="dtend dt-end" title="2012-12-13T20:30:00" datetime="2012-12-13T20:30:00">8:30pm</time></div> <div class="location vcard p-location h-card"> <a class="url" href='http://calagator.org/venues/202389965'><span class='fn org p-name'>Free Geek</span></a> <div class="adr p-adr h-adr"> <div class="street-address p-street-address">1731 SE 10th Avenue</div> <span class="locality p-locality">Portland</span> , <span class="region p-region">OR</span> <span class="postal-code p-postal-code">97214</span> <div class="country-name p-country-name">US</div> (<a href='https://maps.google.com/maps?q=1731%20SE%2010th%20Avenue,%20Portland%20OR%2097214%20US'>map</a>) </div> </div> <div class="description p-description"> <p>speaker: Dana Jacobsen</p> <p> Dana will give a brief introduction to primes, primality testing, and sieves, then show examples in Perl. Dana is the author of the <a href="https://metacpan.org/module/Math::Prime::Util">Math::Prime::Util</a> module on <a href="http://www.cpan.org/">CPAN</a>. Outline: </p> <ul> <li>Primes</li> <li>Applications</li> <li>Primality testing in Perl</li> <li>Sieves</li> <li>15 sieve implementations in Perl including a new string-based sieve</li> <li>6 CPAN modules</li> <li>Performance and memory use</li> <li>Prime Counting</li> </ul> <p> Sadly a lot of the <a href="http://rosettacode.org/wiki/Sieve_of_Eratosthenes#Perl">web</a> <a href="http://www.scriptol.com/programming/sieve.php">examples</a> <a href="http://dada.perl.it/shootout/sieve.perl.html">of</a> <a href="http://www.stonehenge.com/merlyn/UnixReview/col26.html">Perl</a> <a href="http://cpansearch.perl.org/src/ZIGDON/Math-Prime-TiedArray-0.04/lib/Math/Prime/TiedArray.pm">sieves</a> are quite bad, often 3-6x slower than Perl can do. <a href="https://gist.github.com/4162676">We can do better!</a> There are also a number of CPAN modules related to primes, which will briefly be covered. </p> <p>As usual, the meeting will be followed by social hour at the Lucky Lab Brew Pub.</p> </div> <h3>Links</h3> <ul> <li><a class="url u-url" href="http://pdx.pm.org/kwiki/?December2012Meeting">Website</a></li> </ul> </div>