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| <meta name="author" content="Marc Khouzam (Ericsson) and Andreas Olofsson (Adapteva)"> |
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| <div class="slides"> |
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| <section> |
| <h2>CDT and Parallella</h2> |
| <h3>Multicore Debugging for the Masses</h3> |
| <p> |
| Andreas Olofsson (Adapteva)<p> |
| Marc Khouzam (Ericsson) |
| </p> |
| </section> |
| |
| <section> |
| <h2>About us</h2> |
| <br> |
| <ul> |
| <li class="fragment" data-fragment-index="1">Andreas Olofsson</li> |
| <ul class="fragment" data-fragment-index="1"> |
| <li>Founder and CEO of Adapteva</li> |
| <li>Creator of Parallella</li> |
| </ul> |
| <br> |
| <li class="fragment" data-fragment-index="2">Marc Khouzam</li> |
| <ul class="fragment" data-fragment-index="2"> |
| <li>CDT Committer, lead for Debug</li> |
| <li>Working on Multicore Debugging since the fall of 2010</li> |
| </ul> |
| </ul> |
| </section> |
| <section> |
| <h2>Agenda</h2> |
| <ul> |
| <li>Parallella and Epiphany</li> |
| <li>Debugging Parallella with CDT</li> |
| <li>Possible next steps</li> |
| <li>Other news for CDT Debug</li> |
| <li>Q&A</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>An Epiphany Introduction</h2> |
| <img width="1000px" src="img/Epiphany1.png" alt="Epiphany Architecture"/> |
| </section> |
| <section> |
| <h2>Massive Parallelism Has Arrived!</h2> |
| <img width="1000px" src="img/Epiphany2.png" alt="Massive Parallelism"/> |
| <ul> |
| <li><em>How in the ^**&#@ are we doing to program AND DEBUG this??</em></li> |
| </ul> |
| </section> |
| <section> |
| <h2>The Parallella Computer</h2> |
| <img width="1050px" src="img/Epiphany3.png" alt="Parallella computer"/> |
| </section> |
| <section> |
| <h2>Debugging for Massive Parallelism</h2> |
| <img width="1000px" src="img/Epiphany4.png" alt="Debugging issues"/> |
| </section> |
| |
| <section> |
| <h2>Debugging Parallella with CDT</h2> |
| <ul> |
| <li class="nofragment">Ericsson (CDT) and Adapteva (Parallella) collaboration</li> |
| <li class="fragment" data-fragment-index="2">Goals:</li> |
| <ul> |
| <li class="fragment" data-fragment-index="2">Open-source multicore debug solution for Parallella</li> |
| <li class="fragment" data-fragment-index="2">Open example for multicore debug in CDT</li> |
| <li class="fragment" data-fragment-index="2">Easy access to multicore debugging for all</li> |
| <li class="fragment" data-fragment-index="2">Collaboration and exposure to improve multicore debug</li> |
| </ul> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Previous Debug Solution for Epiphany</h2> |
| <ul> |
| <li class="fragment" data-fragment-index="1">Single-core traditional hardware debug using GDB</li> |
| <li class="fragment" data-fragment-index="1">Load program on a core and debug it</li> |
| <li class="fragment" data-fragment-index="1">No global perspective</li> |
| <li class="fragment" data-fragment-index="1">Needs one session per core to deal with entire system</li> |
| <li class="fragment" data-fragment-index="1">Does not scale past 16 cores, and even then</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Implemented Enhancements</h2> |
| <ul> |
| <br> |
| <li class="fragment" data-fragment-index="1">Single session to debug the entire Epiphany</li> |
| <li class="fragment" data-fragment-index="1">Connecting to an already running system</li> |
| <br> |
| <li class="fragment" data-fragment-index="2">A <em>debug thread</em> is a single core</li> |
| <li class="fragment" data-fragment-index="2">A <em>debug process</em> is a group of cores running the same binary</li> |
| <li class="fragment" data-fragment-index="2">Traditional debugging for each core</li> |
| <br> |
| <li class="fragment" data-fragment-index="3">Epiphany Multicore Visualizer</li> |
| <br> |
| <li class="fragment" data-fragment-index="4">Support for Non-stop mode</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Debugging the main chip</h2> |
| <img class="fragment" data-fragment-index="1" width="900px" src="img/ParallellaDebug1.png" alt="Debug of Parallella main chip"/> |
| <ul> |
| <li class="fragment" data-fragment-index="1">Remote Debug of ARM chip (Ubuntu) with GDB/gdbserver</li> |
| <li class="fragment" data-fragment-index="1">Traditional debug operations for ARM program</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Multicore Debugging the Epiphany</h2> |
| <img class="fragment" data-fragment-index="1" height="550px" src="img/ParallellaDebug2.png" alt="Debug of Epiphany chip"/> |
| <ul> |
| <li class="fragment" data-fragment-index="1">Remote Multicore Debug of Epiphany with e-GDB/e-server</li> |
| <li class="fragment" data-fragment-index="1">Traditional debug operations for all Epiphany cores</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Multicore Debugging Parallella</h2> |
| <ul> |
| <li class="fragment">Debug using both sessions</li> |
| </ul> |
| <img class="fragment" width="1000px" src="img/ParallellaDebug3.png" alt="Debug of Parallella main chip"/> |
| </section> |
| |
| <section> |
| <h2>Scaling issues</h2> |
| <img style="float:left;margin-left:200px" height="700px" class="fragment" data-fragment-index="1" src="img/ParallellaDebugScaling.png" alt="Debug view not scaling"/> |
| <br><br><br><br> |
| <ul> |
| <li class="fragment" data-fragment-index="2">Debug view with 64 cores</li> |
| <li class="fragment" data-fragment-index="2">Unmanageable!</li> |
| <li class="fragment" data-fragment-index="2">Need Visualization</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Generic Multicore Visualizer</h2> |
| <img class="fragment" data-fragment-index="1" src="img/MulticoreVisualizerTriplet.png" alt="Generic Multicore Visualizer"/> |
| <ul> |
| <li class="fragment" data-fragment-index="1">Monitor entire system at a glance</li> |
| <li class="fragment" data-fragment-index="1">Control program execution from Visualizer</li> |
| <li class="fragment" data-fragment-index="1">Synchronized with Debug view</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Epiphany Multicore Visualizer</h2> |
| <ul> |
| <li class="fragment" data-fragment-index="1">Hardware layout</li> |
| <li class="fragment" data-fragment-index="1">Cores and network</li> |
| <li class="fragment" data-fragment-index="1">Process distribution</li> |
| <li class="fragment" data-fragment-index="1">Load of cores</li> |
| <li class="fragment" data-fragment-index="1">Load of network</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Epiphany Multicore Visualizer Layout</h2> |
| <img style="float:left" width="550px" src="img/Epiphany16Layout.png" alt="Epiphany Visualizer Layout"/> |
| <br><br><br><br> |
| <ul> |
| <li class="fragment" data-fragment-index="1">Actual hardware layout</li> |
| <li class="fragment" data-fragment-index="1">Core IDs</li> |
| <li class="fragment" data-fragment-index="1">Color shows binary loaded</li> |
| <li class="fragment" data-fragment-index="1">Selection of cores</li> |
| <li class="fragment" data-fragment-index="1">Status bar info</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Program Distribution and Load</h2> |
| <img style="float:left" width="550px" src="img/Epiphany16Load.png" alt="Program Distribution"/> |
| <br><br><br><br> |
| <ul> |
| <li class="fragment" data-fragment-index="1">Layout with network</li> |
| <li class="fragment" data-fragment-index="1">Load per core</li> |
| <li class="fragment" data-fragment-index="1">Load per network link</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>64-core Layout</h2> |
| <img width="700px" src="img/Epiphany64Layout.png" alt="Network Load"/> |
| </section> |
| |
| <section> |
| <h2>64-core Load</h2> |
| <img width="700px" src="img/Epiphany64Load.png" alt="Network Load"/> |
| </section> |
| |
| <section> |
| <h2>Possible next steps</h2> |
| </section> |
| |
| <section> |
| <h2>Status reporting</h2> |
| <ul> |
| <li class="fragment">Running state per core in Visualizer</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Grouping</h2> |
| <ul> |
| <li class="fragment" data-fragment-index="1">GDB IT sets support</li> |
| <li class="fragment" data-fragment-index="1">Run Control operations on group</li> |
| <li class="fragment" data-fragment-index="1">Breakpoints limited to group</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>User-selectable cores to debug</h2> |
| <img width="600px" src="img/SelectableCores.png" alt="Selecting cores to debug"/> |
| <ul> |
| <li class="fragment" data-fragment-index="1">Attach to a group/process to debug it</li> |
| <li class="fragment" data-fragment-index="1">Debug view only shows attached groups</li> |
| <li class="fragment" data-fragment-index="1">Attaching directly from Visualizer</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Debugging thousands of cores</h2> |
| <ul> |
| <li class="fragment">4096 cores</li> |
| </ul> |
| <p> |
| <img class="fragment" width="700px" src="img/Epiphany4096Layout.png" alt="Thousands of cores mockup"/> |
| </section> |
| |
| <section> |
| <h2>Debugging thousands of cores</h2> |
| <h3>Possible solutions</h3> |
| <ul> |
| <li class="fragment" data-fragment-index="1">Zooming</li> |
| <li class="fragment" data-fragment-index="1">Use of scrollbars or mouse drag</li> |
| <li class="fragment" data-fragment-index="1">Use of colors to pin-point an issue</li> |
| <li class="fragment" data-fragment-index="1">Automatic issue detection</li> |
| <br> |
| <li class="fragment" data-fragment-index="2"><em>More study needed, more collaboration</em></li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Visualizer Zooming</h2> |
| <img style="float:left" class="fragment" data-fragment-index="1" height="450px" src="img/Zoom1.png" alt="Before zooming"/> |
| <img style="float:right" class="fragment" data-fragment-index="2" height="450px" src="img/Zoom2.png" alt="After zooming"/> |
| <ul> |
| <li class="fragment" data-fragment-index="3">Zoom directly</li> |
| <li class="fragment" data-fragment-index="4">Pin & Clone</li> |
| <ul> |
| <li class="fragment" data-fragment-index="4">Multiple Visualizer views</li> |
| <li class="fragment" data-fragment-index="4">One high-level view</li> |
| <li class="fragment" data-fragment-index="4">One or more zoomed views</li> |
| </ul> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Visualizer Pin & Clone</h2> |
| <img class="nofragment" width="1050px" src="img/DoubleVisualizer.png" alt="Visualizing both chips"/> |
| <ul> |
| <li class="nofragment">The entire Parallella: ARM and Epiphany chips</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Other news for CDT Debug</h2> |
| </section> |
| |
| <section> |
| <h2>Return Values</h2> |
| <img width="1000px" src="img/ReturnValues.png" alt="Display of Return Values"/> |
| <ul> |
| <li>After a Step-Return</li> |
| <li>Top element of Variables view</li> |
| <li>Removed at next execution</li> |
| <li>Plan to generalize for Step-Over</li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>Trace Control View</h2> |
| <img style="float:left" width="500px" src="img/Tracing1.png" alt="Tracing Experiment"/> |
| <br><br> |
| <ul> |
| <li>Graphical view</li> |
| <li>Navigation Scrollbar</li> |
| <li>Circular Buffer</li> |
| <li>Disconnected Tracing</li> |
| <li>Optional automatic refresh</li> |
| </ul> |
| <img width="550px" src="img/Tracing2.png" alt="Examining Tracing Result"/> |
| </section> |
| |
| <section> |
| <h2>Dynamic-Printf</h2> |
| <img style="float:left" width="475px" src="img/DPrintfSelect.png" alt="Dynamic Printf Type"/> |
| <br><br> |
| <ul> |
| <li>No re-compiling</li> |
| <li>No re-deploying</li> |
| <li>Debugger can disconnect</li> |
| </ul> |
| <img width="575px" src="img/DPrintfProperties.png" alt="Dynamic Printf Properties"/> |
| </section> |
| |
| <section> |
| <h2>Hardware and Temporary Breakpoints</h2> |
| <img width="800px" src="img/HardwareBp.png" alt="Breakpoint type"/> |
| <ul> |
| <li>Through <em>Add Breakpoint</em> or <em>Breakpoint Properties</em></li> |
| </ul> |
| </section> |
| |
| <section> |
| <h2>New Launch UI</h2> |
| <img width="1000px" src="img/NewLaunchUI.png" alt="New Launch UI"/> |
| </section> |
| |
| <section> |
| <h2>Standalone CDT Debugger</h2> |
| <pre><code>> run-gdbstandalone.sh [-b <build_log>] -e <binary> [arg1 ... argn]</code></pre> |
| <img width="900px" src="img/StandaloneDebugger.png" alt="Standalone Debugger"/> |
| </section> |
| |
| <section> |
| <h2>Resources</h2> |
| <ul> |
| <a href="https://www.parallella.org/">Parallella</a><br> |
| <a href="https://wiki.eclipse.org/CDT/MultiCoreDebugWorkingGroup">Multicore Debug Workgroup</a><br> |
| <a href="https://wiki.eclipse.org/CDT/User/NewIn83#Debug">CDT 8.3 Debug New & Noteworthy</a><br> |
| <a href="https://wiki.eclipse.org/CDT/User/NewIn84#Debug">CDT 8.4 Debug New & Noteworthy</a><br> |
| <a href="https://wiki.eclipse.org/CDT/User/FAQ#Debugging_C.2FC.2B.2B_Projects">CDT Debug FAQ</a><br> |
| <a href="https://wiki.eclipse.org/CDT/StandaloneDebugger">CDT Standalone Debugger</a><br> |
| <a href="https://www.adapteva.com/">Adapteva</a><br> |
| <a href="https://www.ericsson.com/article/open_source_1714451213_c">Ericsson Open-Source</a><br> |
| </ul> |
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