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  <div class="vevent h-event"> <h1 class="summary p-name">Portland C++ User's Group (PDXCPP)</h1> <div class='date'><time class="dtstart dt-start" title="2019-09-10T19:00:00" datetime="2019-09-10T19:00:00">Tuesday, September 10, 2019 from 7</time>–<time class="dtend dt-end" title="2019-09-10T21:00:00" datetime="2019-09-10T21:00:00">9pm</time></div> <div class="location vcard p-location h-card"> <a class="url" href='http://calagator.org/venues/202396366'><span class='fn org p-name'>Citrix</span></a> <div class="adr p-adr h-adr"> <div class="street-address p-street-address">421 Southwest 6th Avenue</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%20Southwest%206th%20Avenue,%20Portland%20OR%2097204%20US'>map</a>) </div> </div> <div class="description p-description"> <p>We're very excited to welcome you to the Portland C++ User's Group (PDXCPP) meetup for a Special Event! Join us in downtown Portland at our host, Citrix. Note that we are meeting on the SECOND Tuesday of the month rather than the usual third Tuesday.</p> <p><a href="https://www.citrix.com/">https://www.citrix.com/</a></p> <p>The evening will begin with pizza and beverages, and we are very pleased to welcome Bryce Adelstein Lelbach as our special guest speaker! Bryce will be giving a preview of his CppCon 2019 talk, "The C++20 synchronization library".</p> <ul> <li>The C++20 Syncronization Library: In the decade since C++11 shipped, the hardware landscape has changed drastically. 10 years ago, we were still in the early stages of the concurrent processing revolution; 2 to 4 hardware threads were common and more than 10 was "many". Our tolerance for synchronization latency was greater; we were willing to pay microseconds and milliseconds.</li> </ul> <p>Today, dozens and hundreds of threads are common, and "many" means hundreds of thousands. Concurrent applications are plagued by contention challenges that were unimaginable a decade ago. With the traditional tools we have today, programmers often have to choose between unacceptable contention and unacceptable high latency when synchronizing between threads.</p> <p>The C++20 synchronization library brings solutions - new lightweight synchronization primitives that can efficiently marshall hundreds of thousands of threads:</p> <ul> <li> <code>std::atomic::wait</code>/<code>std::atomic::notify_*</code>: Efficient atomic waiting.</li> <li> <code>std::atomic_ref</code>: Atomic operations on non-<code>std::atomic</code> objects.</li> <li> <code>std::counting_semaphore</code>: Lightweight access coordination.</li> <li> <code>std::latch</code> and <code>std::barrier</code>: Marshalling groups of threads.</li> </ul> <p>In this example-oriented talk, you'll learn how and when to use these new tools to build scalable, modern C++ applications that can run in parallel on virtual any hardware, from embedded controllers to server CPUs to modern GPUs.</p> <ul> <li>About Bryce: Bryce Adelstein Lelbach has spent nearly a decade developing libraries in C++. Bryce is passionate about C++ evolution and is one of the leaders of the C++ community. He is an officer of ISO/IEC JTC1/SC22/WG21, the C++ Standards Committee. Bryce chairs both the C++ Committee's Tooling Study Group (SG15) and Library Evolution Incubator (SG18). He is the program chair for the C++Now and CppCon conferences, and the chief organizer of the Bay Area C++ User Group. On the C++ Committee, he has personally worked on the C++17 parallel algorithms, executors, futures, senders/receivers, multidimensional arrays, and modules. Bryce works at NVIDIA, where he leads the CUDA C++ core libraries team. He is one of the initial developers of the HPX parallel runtime system. He also helped start the LLVMLinux initiative and has occasionally contributed to the Boost C++ libraries.</li> </ul> <p>--</p> </div> <h3>Links</h3> <ul> <li><a class="url u-url" href="https://www.meetup.com/pdxcpp/">Website</a></li> </ul> </div>