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  <div class="vevent h-event"> <h1 class="summary p-name">Galois Tech Talk: A Scalable I/O Manager for GHC</h1> <div class='date'><time class="dtstart dt-start" title="2010-01-29T13:30:00" datetime="2010-01-29T13:30:00">Friday, January 29, 2010 from 1:30</time>–<time class="dtend dt-end" title="2010-01-29T14:30:00" datetime="2010-01-29T14:30:00">2:30pm</time></div> <div class="location vcard p-location h-card"> <a class="url" href='http://calagator.org/venues/202390439'><span class='fn org p-name'>Galois, Inc</span></a> <div class="adr p-adr h-adr"> <div class="street-address p-street-address">421 SW 6th Ave. Suite 300</div> <span class="locality p-locality">Portland</span> , <span class="region p-region">OR</span> <span class="postal-code p-postal-code">97204</span> <div class="country-name p-country-name">US</div> (<a href='https://maps.google.com/maps?q=421%20SW%206th%20Ave.%20Suite%20300,%20Portland%20OR%2097204%20US'>map</a>) </div> </div> <div class="description p-description"> <p>A Scalable I/O Manager for GHC</p> <p>Presented by Johan Tibell.</p> <p>Abstract: The Glasgow Haskell Compiler supports extraordinarily cheap threads. These are implemented using a two-level model, with threads scheduled across a set of OS-level threads. Since the lightweight threads can’t afford to block when performing I/O operations, when a Haskell program starts, it runs an I/O manager thread whose job is to notify other threads when they can safely perform I/O.</p> <p>The I/O manager manages its file descriptors using the select system call. While select performs well for a small number of file descriptors, it doesn’t scale to a large number of concurrent clients, making GHC less attractive for use in large-scale server development.</p> <p>This talk will describe a new, more scalable I/O manager that’s currently under development and that hopefully will replace the current I/O manager in a future release of GHC.</p> <p>Details: Date: January 29th, 2010, Friday Time: 1:30pm Location: Galois Inc., 421 SW 6th Ave. Suite 300 (3rd floor of the Commonwealth building)</p> <p>Bio: Johan Tibell is a Software Engineer at Google Inc. He received a M.S. in Software Engineering from the Chalmers University of Technology, Sweden, in 2007.</p> </div> <h3>Links</h3> <ul> <li><a class="url u-url" href="http://www.galois.com/blog/2010/01/20/tech-talk-a-scalable-io-manager-for-ghc/">Website</a></li> </ul> </div>