Release briefing 4.6

Content/ReleaseBriefings/4_6/Section_BackendUpdates.tex

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+%==========================================================================
+
+\begin{frame}[fragile]
+
+  {\Huge Backend Updates}
+
+  \vspace{10pt}
+
+  \textbf{Content:}
+  \begin{itemize}
+    \item Backend Updates CUDA
+    \item Backend Updates HIP
+    \item Backend Updates SYCL
+  \end{itemize}
+
+\end{frame}
+
+%==========================================================================
+
+% Examples
+
+% note: always keep the [fragile] for your frames!
+
+%\begin{frame}[fragile]{Example list}
+%  \begin{itemize}
+%      \item Item 1
+%      \item Item 2 with some \texttt{code}
+%      \begin{itemize}
+%        \item Sub-item 2.1
+%        \item Sub-item 2.2
+%      \end{itemize}
+%  \end{itemize}
+%\end{frame}
+
+%\begin{frame}[fragile]{Example code}
+%    \begin{code}[keywords={std}]
+%        #include <iostream>
+%        
+%        int main() {
+%            std::cout << "hello world\n";
+%        }
+%    \end{code}
+%\end{frame}
+
+%\begin{frame}[fragile]{Example table}
+%    \begin{center}
+%        \begin{tabular}{l|l}
+%            a & b \\\hline
+%            c & d
+%        \end{tabular}
+%    \end{center}
+%\end{frame}
+
+%==========================================================================
+
+
+%==========================================================================
+

Content/ReleaseBriefings/4_6/Section_BreakingChanges.tex

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+%==========================================================================
+
+\begin{frame}[fragile]
+
+  {\Huge Deprecations and other breaking changes}
+
+  \vspace{10pt}
+
+\end{frame}
+
+
+\begin{frame}[fragile]{Intel Classic Compiler}
+  \begin{itemize}
+    \item Intel has long since deprecated Intel Classic (since around 2022), and removed from oneAPI 2024.0 release
+    \item In order to focus on newer compilers, and reduce maintenance burden, we have \textbf{removed} support for Intel Classic (oneAPI Intel/icx still supported of course!)
+  \end{itemize}
+\end{frame}
+
+
+\begin{frame}[fragile]{DualView changes}
+  \textbf{Deprecate} direct access to \texttt{d\_view} and \texttt{h\_view}
+  \begin{itemize}
+    \item Modifying the allocations in d\_view and h\_view is dangerous, especially if \texttt{modify} and \texttt{sync} are skipped
+    \item Use \texttt{view\_host} and \texttt{view\_device} instead
+    \item These two functions return by value with deprecated code enabled and by reference otherwise. This might have perfomance implications if used extensively, e.g., in loop bounds.
+  \end{itemize}
+\end{frame}
+
+
+\begin{frame}[fragile]{Experimental SIMD changes}
+  \begin{itemize}
+    \item \texttt{native\_simd}, \texttt{native\_simd\_mask} \textbf{deprecated} to align with the C++26 standard
+    \item \textbf{Removed} Obtaining a reference from \texttt{*simd*::operator[]} to align with the C++26 Standard
+    \item \textbf{Changed} the return type of \texttt{Kokkos::Experimental::*simd*::operator==} and \texttt{operator!=} to return SIMD masks instead of \texttt{bool}
+    \begin{itemize}
+      \item If you want old behavior, use \texttt{all\_of(a == b)}
+    \end{itemize}
+  \end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Additional Deprecations and Removals}
+  \begin{itemize}
+    \item Already discussed deprecating the Makefile
+    \item StaticCrsGraph is \textbf{moved} to Kokkos Kernels and \textbf{deprecated} in Core
+    \begin{itemize}
+      \item See \url{https://github.com/kokkos/kokkos-kernels/pull/2419}
+      \item Symbol is in Kernels under \texttt{KokkosSparse::StaticCrsGraph}
+    \end{itemize}
+  \end{itemize}
+\end{frame}
+%==========================================================================
+
+% Examples
+
+% note: always keep the [fragile] for your frames!
+
+%\begin{frame}[fragile]{Example list}
+%  \begin{itemize}
+%      \item Item 1
+%      \item Item 2 with some \texttt{code}
+%      \begin{itemize}
+%        \item Sub-item 2.1
+%        \item Sub-item 2.2
+%      \end{itemize}
+%  \end{itemize}
+%\end{frame}
+
+%\begin{frame}[fragile]{Example code}
+%    \begin{code}[keywords={std}]
+%        #include <iostream>
+%        
+%        int main() {
+%            std::cout << "hello world\n";
+%        }
+%    \end{code}
+%\end{frame}
+
+%\begin{frame}[fragile]{Example table}
+%    \begin{center}
+%        \begin{tabular}{l|l}
+%            a & b \\\hline
+%            c & d
+%        \end{tabular}
+%    \end{center}
+%\end{frame}
+
+%==========================================================================
+
+
+%==========================================================================

Content/ReleaseBriefings/4_6/Section_BugFixes.tex

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+%==========================================================================
+
+
+% Fix performance bug affecting atomic_fetch_{add,sub,min,max,and,or,xor} on integral types long and unsigned long with HIP #7816
+% Performance bug in RangePolicy: construct error message if and only if the precondition is violated #7809
+% Fix execution of ranges with more than 2B elements #7797
+% Fix clean target when embedding Kokkos in another project #7557
+% Build system: hint to ARCH_NATIVE if ARMv9 Grace arch is not explicitly supported by the compiler #7862
+% Fix Zen3 flag for NVHPC #7558
+% Use right arch for MI300A in makefiles #7786
+% graph: nodes must be stored by the graph #7619
+% Make sure lock arrays are on device before launching a graph #7685
+% Cuda: fix incorrect iteration in MDRangePolicy of rank > 4 for high iteration counts #7724
+% Cuda: ignore gcc assembler options in nvcc-wrapper #7492
+
+% simd: fix a bug in scalar min/max #7813
+% simd: fix a bug in non-masked reductions #7845
+% Fix compiling BasicView on MSVC #7751
+
+
+\begin{frame}[fragile]
+
+  {\Huge Bug Fixes}
+
+  \vspace{10pt}
+
+\end{frame}
+
+\begin{frame}[fragile]{General bug fixes}
+  \begin{itemize}
+      \item Fix execution of ranges with more than 2 billion elements
+      \item Graph:
+      \begin{itemize}
+        \item Fix graph node lifetime issues
+        \item FIx lock-based atomics failure when launching CUDA and HIP graphs
+      \end{itemize}
+      \item CUDA backend: Fix incorrect iteration in MDRangePolicy of rank $< 4$ for high iteration counts
+      \item SIMD:
+      \begin{itemize}
+        \item fix a bug in scalar min/max
+        \item fix a bug in non-masked reductions
+      \end{itemize}
+      \item Experimental BasicView: fix MSVC compilation
+  \end{itemize}
+ \end{frame}
+
+\begin{frame}[fragile]{Build system fixes}
+  \begin{itemize}
+      \item Fix clean target when embedding Kokkos in another project
+      \item Stop generation if ARMv9 Grace arch is not explicitly supported by the compiler when \texttt{KOKKOS\_ARCH\_ARMV9\_GRACE} is specified
+      \begin{itemize}
+        \item Can still try and configure with \texttt{ARCH\_NATIVE}, and error message modified to suggest this
+      \end{itemize}
+      \item Fix Zen3 flag for NVHPC
+      \item Use right arch for MI300A in makefiles
+      \item (CUDA) ignore gcc assembler options in nvcc-wrapper
+  \end{itemize}
+ \end{frame}
+
+\begin{frame}[fragile]{Performance bugfixes}
+ \begin{itemize}
+     \item Fix performance bug affecting atomic\_fetch\_\{add,sub,min,max,and,or,xor\} on integral types long and unsigned long with HIP
+     \item Fix performance of \texttt{RangePolicy} where error message is generated even if precondition not violated
+ \end{itemize}
+\end{frame}
+%==========================================================================
+
+% Examples
+
+% note: always keep the [fragile] for your frames!
+
+%\begin{frame}[fragile]{Example list}
+%  \begin{itemize}
+%      \item Item 1
+%      \item Item 2 with some \texttt{code}
+%      \begin{itemize}
+%        \item Sub-item 2.1
+%        \item Sub-item 2.2
+%      \end{itemize}
+%  \end{itemize}
+%\end{frame}
+
+%\begin{frame}[fragile]{Example code}
+%    \begin{code}[keywords={std}]
+%        #include <iostream>
+%        
+%        int main() {
+%            std::cout << "hello world\n";
+%        }
+%    \end{code}
+%\end{frame}
+
+%\begin{frame}[fragile]{Example table}
+%    \begin{center}
+%        \begin{tabular}{l|l}
+%            a & b \\\hline
+%            c & d
+%        \end{tabular}
+%    \end{center}
+%\end{frame}
+
+%==========================================================================
+
+
+%==========================================================================

Content/ReleaseBriefings/4_6/Section_BuildSystemUpdates.tex

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+%==========================================================================
+
+\begin{frame}[fragile]
+
+  {\Huge Build Systems Updates}
+
+  \vspace{10pt}
+
+\end{frame}
+
+%==========================================================================
+
+% Examples
+
+% note: always keep the [fragile] for your frames!
+
+%\begin{frame}[fragile]{Example list}
+%  \begin{itemize}
+%      \item Item 1
+%      \item Item 2 with some \texttt{code}
+%      \begin{itemize}
+%        \item Sub-item 2.1
+%        \item Sub-item 2.2
+%      \end{itemize}
+%  \end{itemize}
+%\end{frame}
+
+%\begin{frame}[fragile]{Example code}
+%    \begin{code}[keywords={std}]
+%        #include <iostream>
+%        
+%        int main() {
+%            std::cout << "hello world\n";
+%        }
+%    \end{code}
+%\end{frame}
+
+%\begin{frame}[fragile]{Example table}
+%    \begin{center}
+%        \begin{tabular}{l|l}
+%            a & b \\\hline
+%            c & d
+%        \end{tabular}
+%    \end{center}
+%\end{frame}
+
+%==========================================================================
+
+
+%==========================================================================

Content/ReleaseBriefings/4_6/Section_GeneralEnhancements.tex

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+%==========================================================================
+
+\begin{frame}[fragile]
+
+  {\Huge General Enhancements}
+
+  \vspace{10pt}
+
+\end{frame}
+
+%==========================================================================
+
+% Examples
+
+% note: always keep the [fragile] for your frames!
+
+%\begin{frame}[fragile]{Example list}
+%  \begin{itemize}
+%      \item Item 1
+%      \item Item 2 with some \texttt{code}
+%      \begin{itemize}
+%        \item Sub-item 2.1
+%        \item Sub-item 2.2
+%      \end{itemize}
+%  \end{itemize}
+%\end{frame}
+
+%\begin{frame}[fragile]{Example code}
+%    \begin{code}[keywords={std}]
+%        #include <iostream>
+%        
+%        int main() {
+%            std::cout << "hello world\n";
+%        }
+%    \end{code}
+%\end{frame}
+
+%\begin{frame}[fragile]{Example table}
+%    \begin{center}
+%        \begin{tabular}{l|l}
+%            a & b \\\hline
+%            c & d
+%        \end{tabular}
+%    \end{center}
+%\end{frame}
+
+%==========================================================================
+
+\begin{frame}[fragile]{Fix a warning from kokkos\_check}
+ \begin{itemize}
+    \item \texttt{kokkos\_check}: makes sure that Kokkos was built with the requested backends and target architectures and generates a fatal error if it was not.
+    \item Fix a warning when a user calls the cmake function \texttt{kokkos\_check} from a \texttt{<PackageName>Config.cmake} file
+    {\tiny \begin{verbatim}
+CMake Warning (dev) at /usr/share/cmake-3.22/Modules/FindPackageHandleStandardArgs.cmake:438 (message):
+  The package name passed to `find_package_handle_standard_args`
+  (Kokkos_DEVICES) does not match the name of the calling package (SomePackage).
+  This can lead to problems in calling code that expects `find_package`
+  result variables (e.g., `_FOUND`) to follow a certain pattern.
+Call Stack (most recent call first):
+  ... /kokkos/lib/cmake/Kokkos/KokkosConfigCommon.cmake:110 (find_package_handle_standard_args)
+  ...
+This warning is for project developers.  Use -Wno-dev to suppress it.
+    \end{verbatim}}
+ \end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{\texttt{inclusive\_scan} performance improvements}
+  With the Cuda and HIP backends, \texttt{Kokkos::Experimental::inclusive\_scan} now calls the vendor versions from Thrust
+  \begin{itemize}
+     \item The vendor versions are faster than the \texttt{Kokkos::parallel\_scan} based default implementation
+     \item Both backends call the vendor versions by default
+       \begin{itemize}
+         \item The HIP version is called when \texttt{Kokkos\_ENABLE\_ROCTHRUST} is \texttt{ON} (which is the default)
+       \end{itemize}
+  \end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Reduce tooling interface overhead}
+  Reduced the overhead of Kokkos tools related checks
+  \begin{itemize}
+      \item Store the information whether Kokkos tools are enabled after each modification to the tools callbacks
+      \item Previously, this value was recomputed everytime an event of interest (\texttt{parallel\_for}, \texttt{fence}, etc.) occured
+      \item Mostly noticeable in small serial kernels (around 100 elements)
+  \end{itemize}
+\end{frame}
+
+%==========================================================================