template class QueueSchedulerIssue { std::atomic writeIndex; std::atomic readIndex; std::unique_ptr<std::pair> elements; bool try_push(T&& try_push(T&& value) { auto my_entry = writeIndex.fetch_add(1); elements[my_entry].first = std::move(value); // No code, does not mean no-time. // scheduler will hit here, and // block the queue while (elements[my_entry].second != my_entry) ; // spin and wait, maybe with pause(); value = std::move(elements[my_entry].first); return true; } }; Lockfree, MPMC Queue - Scheduler InteractionLockfree

Limitations and Problems in std::function and similar constructs Amandeep Chawla | Sr. Computer Scientist II amandeep@adobe.com | adchawla@gmail.com Image by Bruno Tornielli© 2024 Adobe. All Rights whose type we can control. ▪ std::function© 2024 Adobe. All Rights Reserved. Adobe Confidential. Task Based Mechanism© 2024 Adobe. All Rights Reserved. Adobe Confidential. std::function ▪ Is a class template template ▪ It is a general-purpose polymorphic function wrapper ▪ Instances of std::function can store, copy, and invoke any CopyConstructible Callable target ▪ Uses type-erasure under the hood to gain

https://github.com/kokkos/mdspangithub.com/griswaldbrooks/spanny2 goals ● deeper understanding of std::mdspan layouts and accessors ● how to write custom layouts and accessors ● dispel common misconceptions memory accessor ● improving memory access using asynchronicity 4 ● motivations for std::mdspan ● review std::mdspan declarationgithub.com/griswaldbrooks/spanny2 how ● layouts and their requirements memory accessor ● improving memory access using asynchronicity 5 ● motivations for std::mdspan ● review std::mdspan declarationgithub.com/griswaldbrooks/spanny2 how ● layouts and their requirements

elements std::sort, std::stable_sort, ranges::sort, etc std::sort(begin, end); std::ranges::sort(cont); 4REMINDERS Sorting is the ordering of elements std::sort, std::stable_sort std::stable_sort, ranges::sort, etc std::sort(begin, end, comp); std::ranges::sort(cont, comp); 5QUICKSORT 6QUICKSORT Quick sort 6.1QUICKSORT Quick sort Take any element 6.2QUICKSORT __quick_sort_loop(first, last); 4 } 5 9Quick sort (STL version) 10STANDARD LIBRARY EVOLVED FROM STL 11STD::SORT 12STD::SORT 12.1Quicksort's worst case is Just pick the worst element 13GCC libstdc++ template

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Allocation // cpu std::vector x(N); std::vector y(N); // … // gpu // ??? // ??? // … 15 |• Added in C++17: • std::pmr::memory_resource • std::pmr::polymorphic_allocator • std::pmr::vector std::pmr::vector • std::pmr::monotonic_buffer_resource • … std::pmr 16 |// gpu unified_memory_resource mem; std::pmr::vector x(N, &mem); std::pmr::vector y(N, &mem); // … Memory Allocation 17 |struct rce : std::pmr::memory_resource { void* do_allocate(std::size_t, std::size_t); void do_deallocate( void* p, std::size_t, std::size_t); bool do_is_equal( const std::pmr::memory_resource&

Center (DLR) Institute of Software Methods for Product Virtualization VECTORIZING A CFD CODE WITH STD::SIMD SUPPLEMENTED BY (ALMOST) TRANSPARENT LOADING AND STORINGMotivation: The Origin of the Talk deduction to load and store std::simd and scalar variables ▪ syntactically equalize scalar and vectorized code The talk: ▪ share experience with vectorization using std::simd ▪ introduce the SIMD_ACCESS instruction adds/multiplies/… multiple set of operands at once → Single Instruction Multiple Data (SIMD) For more details Matthias Kretz‘ Cppcon talk about std::simd: https://youtu.be/LAJ_hywLtMA

Is std::mdspan a Zero-overhead Abstraction? Oleksandr Bacherikov Snap IncWhat is std::mdspan? It’s a view over a multi-dimensional array. It’s designed primarily to be used as a function parameter parameter. 3What is the simplest multi-dimensional function? 4What is the simplest multi-dimensional function? Let’s take the smallest dimension more than 1, which is 2. The most common 2-dimensional object object is a matrix. 5What is the simplest multi-dimensional function? Let’s take the smallest dimension more than 1, which is 2. The most common 2-dimensional object is a matrix. Let’s take a simple operation

1 Dominik Grabiec - Techniques to Optimise Multi-threaded Data Building During Game Development - CppCon 2024Hello My name is Dominik Grabiec This talk is