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| options +includes | ||
| addoutputfilter INCLUDES html | ||
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| satisfy all | ||
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| #authtype csenetid | ||
| #require valid-user | ||
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| <!--#include virtual="header.inc" --> | ||
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| <div class="navbar navbar-fixed-top"> | ||
| <div class="navbar-inner"> | ||
| <div class="container"> | ||
| <a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse"> | ||
| <span class="icon-bar"></span> | ||
| <span class="icon-bar"></span> | ||
| <span class="icon-bar"></span> | ||
| </a> | ||
| <a class="brand" href="index.html">Grappa</a> | ||
| <div class="nav-collapse"> | ||
| <ul class="nav"> | ||
| <li><a href="index.html">Home</a></li> | ||
| <li class="active"><a href="about.html">About</a></li> | ||
| <li><a href="contact.html">Contact</a></li> | ||
| <!-- <li><a href="#download">Download</a></li> --> | ||
| </ul> | ||
| </div><!--/.nav-collapse --> | ||
| </div> | ||
| </div> | ||
| </div> | ||
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| <div class="container"> | ||
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| <h2>About Grappa</h2> | ||
| <div class="row"> | ||
| <div class="span8"> | ||
| <p>Grappa is a collaboration between | ||
| the <a href="http://sampa.cs.washington.edu">Sampa Group</a> at the | ||
| University of Washington and | ||
| the <a href="http://cass-mt.pnnl.gov">Center for Adaptive | ||
| Supercomputing Software</a> at Pacific Northwest National | ||
| Laboratory.</p> | ||
| </div> | ||
| </div> | ||
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| <h2>People</h2> | ||
| <div class="row"> | ||
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| <div class="span2" align="center"> | ||
| <img src="images/nelson.jpg" height="100"> | ||
| <h3>Jacob Nelson</h3> | ||
| UW CSE grad student | ||
| </div> | ||
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| <div class="span2" align="center"> | ||
| <img src="images/myers.jpg" height="100"> | ||
| <h3>Brandon Myers</h3> | ||
| UW CSE grad student | ||
| </div> | ||
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| <div class="span2" align="center"> | ||
| <img src="images/holt.jpg" height="100"> | ||
| <h3>Brandon Holt</h3> | ||
| UW CSE grad student | ||
| </div> | ||
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| </div> | ||
| <div class="row"> | ||
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| <div class="span2" align="center"> | ||
| <img src="images/kahan.jpg" height="100"> | ||
| <h3>Simon Kahan</h3> | ||
| Co-PI, PNNL | ||
| </div> | ||
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| <div class="span2" align="center"> | ||
| <img src="images/briggs.jpg" height="100"> | ||
| <h3>Preston Briggs</h3> | ||
| UW CSE affiliate faculty | ||
| </div> | ||
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| </div> | ||
| <div class="row"> | ||
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| <div class="span2" align="center"> | ||
| <img src="images/ceze.jpg" height="100"> | ||
| <h3>Luis Ceze</h3> | ||
| Co-PI, UW CSE professor | ||
| </div> | ||
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| <div class="span2" align="center"> | ||
| <img src="images/ebeling.jpg" height="100"> | ||
| <h3>Carl Ebeling</h3> | ||
| UW CSE professor | ||
| </div> | ||
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| <div class="span2" align="center"> | ||
| <img src="images/oskin.jpg" height="100"> | ||
| <h3>Mark Oskin</h3> | ||
| UW CSE professor | ||
| </div> | ||
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| </div> | ||
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| <hr> | ||
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| <footer> | ||
| <p>© University of Washington CSE 2012</p> | ||
| </footer> | ||
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| </div> <!-- /container --> | ||
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| <!--#include virtual="footer.inc" --> |
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| <!--#include virtual="header.inc" --> | ||
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| <div class="navbar navbar-fixed-top"> | ||
| <div class="navbar-inner"> | ||
| <div class="container"> | ||
| <a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse"> | ||
| <span class="icon-bar"></span> | ||
| <span class="icon-bar"></span> | ||
| <span class="icon-bar"></span> | ||
| </a> | ||
| <a class="brand" href="index.html">Grappa</a> | ||
| <div class="nav-collapse"> | ||
| <ul class="nav"> | ||
| <li><a href="index.html">Home</a></li> | ||
| <li><a href="about.html">About</a></li> | ||
| <li><a href="contact.html">Contact</a></li> | ||
| <!-- <li><a href="#download">Download</a></li> --> | ||
| </ul> | ||
| </div><!--/.nav-collapse --> | ||
| </div> | ||
| </div> | ||
| </div> | ||
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| <div class="container"> | ||
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| <div class="row"> | ||
| <div class="span6"> | ||
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| <h3>Global-view task parallelism</h3> | ||
| <p>Execution starts with a single <code>main()</code> | ||
| function. The programmer spawns tasks with optional locality | ||
| constraints, either explicitly or via loop decompositions. The | ||
| runtime chooses where and when to execute them.</p> | ||
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| <h3>Lightweight context switching</h3> | ||
| <p>Grappa executes tasks cooperatively with compiler-assisted | ||
| context switching. Thousands of concurrent tasks are | ||
| multiplexed onto each core.</p> | ||
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| <h3>Balance load by stealing work</h3> | ||
| <p>When a core has no more tasks to run in its local queues, it | ||
| steals from other cores across the cluster.</p> | ||
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| <h3>High bandwidth access to global shared memory</h3> | ||
| <p>Grappa's shared heap is constructed out of chunks allocated | ||
| on each node in the system. Contiguous addresses are spread | ||
| across the chunks in a block-cyclic fashion.</p> | ||
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| <h3>Tolerate global memory latency</h3> | ||
| <p>Remote memory operations are turned into active messages | ||
| directed to a delegate core on the remote node. After issuing | ||
| the message, the requester context-switches to other work | ||
| until the response arrives. The delegate core performs the | ||
| operation. Read-modify-write cycles are performed entirely on | ||
| the delegate core.</p> | ||
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| <h3>Tolerate local memory latency</h3> | ||
| <p>By prefetching and yielding on likely cache misses, Grappa | ||
| exposes more memory parallelism to the processor and increases | ||
| node-local random access bandwidth.</p> | ||
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| <h3>Exploit locality when available</h3> | ||
| <p>When there is locality to be exploited, global memory can be | ||
| accessed through a software caching layer with | ||
| user-controllable granularity.</p> | ||
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| <h3>Mitigate low network injection rates</h3> | ||
| <p>Mass-market networks require large packets to fully utilize | ||
| their bandwidth. Grappa delays messages heading to the same | ||
| destination until it can form a packet of reasonable size.</p> | ||
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| <h3>High-throughput fine-grained synchronization</h3> | ||
| <p>Each synchronization variable is matched with a delegate | ||
| core. All accesses to that variable are performed serially on | ||
| that core using active messages. This allows Grappa to provide | ||
| atomic semantics without performing atomic operations.</p> | ||
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| <p><a class="btn" href="performance.html">See how Grappa performs »</a></p> | ||
| </div> | ||
| </div> | ||
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| <hr> | ||
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| <footer> | ||
| <p>© University of Washington CSE 2012</p> | ||
| </footer> | ||
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| </div> <!-- /container --> | ||
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| <!--#include virtual="footer.inc" --> |
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