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Adding Kokkos test case (#24)
* Initial commit of Kokkos material from internal repo * Updates to Kokkos example for distribution * Update README: explain hwloc & gpu arch flags
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‎README.md

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This example combines the MPI and SGEMM Interop examples to distribute a matrix multiplication problem between MPI ranks.
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[Kokkos](examples/kokkos)
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--------------------------------------------
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[Kokkos](https://github.com/kokkos/kokkos) is a middle-layer for scientific computing which features a SYCL backend. This example
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shows a small Kokkos test case (vector-matrix-vector multiplication), adapted from a test case in the Kokkos repo;
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there is no SYCL code in the example, but it includes scripts to build Kokkos with SYCL support.
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[Hashing Algorithms](examples/hashing)
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--------------------------------------------
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‎examples/kokkos/CMakeLists.txt

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cmake_minimum_required (VERSION 3.10)
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cmake_policy(SET CMP0074 NEW)
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project (Kokkos_Test_Case)
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set(Kokkos_DIR "$ENV{Kokkos_ROOT}" CACHE STRING "Kokkos root directory")
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find_package(Kokkos REQUIRED)
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add_executable(test_case test_case.cpp)
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target_link_libraries(test_case Kokkos::kokkos)
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‎examples/kokkos/README.md

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Simple Test Case for Kokkos
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----
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This is a simple standalone test case taken from the Kokkos repository & packaged up here for use with SYCL.
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It's doing a vector-matrix-vector product. It's an identity matrix with two vectors of 1s, so the expected answer
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is just equal to the problem size.
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Building the test case
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-----
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test_case.cpp contains a simple kernel which has been copied straight from the Kokkos Tutorials (Exercises/02/Solution).
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Build it with build.sh, after setting the environment variable:
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```
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Kokkos_ROOT="[your/kokkos/installation]/lib/cmake/Kokkos"
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```
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Running the test case
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----
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Just launch it! There are optional flags:
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-N : number of rows
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-M : number of columns
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-S : total size
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-nrepeat : how many times to repeat the test (default 100)
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Obviously, not all of N, M & S should be set. The test case will sanity check your args anyway.
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Building Kokkos
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------
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In case you don't have an existing Kokkos build, there are some build scripts in `./kokkos_build_scripts`.
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There are scripts for building Kokkos with SYCL, or CUDA (nvcc or clang).
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Set the following environment variables:
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```
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KOKKOS_INSTALL_DIR=[/your/install/dir]
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KOKKOS_SOURCE_DIR=[/your/source/dir]
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HWLOC_DIR=[/your/hwloc/dir]
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```
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HWLOC
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------
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The [Portable Hardware Locality](https://www.open-mpi.org/projects/hwloc/) (hwloc) package is an optional dependency which enables Kokkos to query the hardware topology of the system on which it is running. If you do not have a HWLOC installation, this option can be removed & Kokkos will be built without HWLOC support.
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SYCL backend
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-------------
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Kokkos should work with any SYCL backend, though the focus of this examples repo is SYCL-For-CUDA.
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Previous work at Codeplay has involved running Kokkos with SYCL on Nvidia hardware with Ampere architecture, hence the flag:
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```
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-DKokkos_ARCH_AMPERE80=ON \
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```
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This flag is not strictly necessary, but it enables Ahead of Time (AoT) compilation, which can give a significant performance gain when building large projects built on Kokkos.
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You should modify the cmake command for your GPU arch.
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‎examples/kokkos/build.sh

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#!/bin/bash
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rm -rf build
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mkdir build
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cd build
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# Set the environment variable Kokkos_ROOT="[your/kokkos/installation]/lib/cmake/Kokkos"
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CXXFLAGS="-Xsycl-target-frontend -O3" \
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LDFLAGS="-Xsycl-target-frontend -O3" \
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cmake .. -G Ninja \
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-DCMAKE_BUILD_TYPE=Debug \
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-DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
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-DCMAKE_CXX_COMPILER=clang++ \
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-DCMAKE_C_COMPILER=clang
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ninja
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cd ..

‎examples/kokkos/kokkos_build_scripts/README.md

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These build scripts are provided for illustration only. They will almost certainly require modification before they work elsewhere.

‎examples/kokkos/kokkos_build_scripts/kokkos_build.sh

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#!/bin/bash
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# Install Kokkos w/ sycl-cuda support
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set -x #echo on
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# Set:
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# KOKKOS_INSTALL_DIR=[/your/install/dir]
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# KOKKOS_SOURCE_DIR=[/your/source/dir]
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# HWLOC_DIR=[/your/hwloc/dir]
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# Configure & build kokkos
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mkdir kokkos-build
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cd kokkos-build
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CXXFLAGS="-Xsycl-target-frontend -O3 -fgpu-inline-threshold=100000 -Wno-unknown-cuda-version -Wno-deprecated-declarations -Wno-linker-warnings -ffast-math" \
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LDFLAGS="-Xsycl-target-frontend -O3" \
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cmake $KOKKOS_SOURCE_DIR -G Ninja \
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-DCMAKE_BUILD_TYPE=Release \
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-DCMAKE_CXX_STANDARD=17 \
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-DCMAKE_CXX_COMPILER=clang++ \
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-DCMAKE_INSTALL_PREFIX=$KOKKOS_INSTALL_DIR \
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-DKokkos_CXX_STANDARD=17 \
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-DKokkos_ENABLE_SYCL=ON \
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-DKokkos_ARCH_HSW=ON \
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-DKokkos_ARCH_AMPERE80=ON \
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-DKokkos_ENABLE_HWLOC=ON \
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-DKokkos_ENABLE_UNSUPPORTED_ARCHS=ON \
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-DKokkos_ENABLE_TESTS=OFF \
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-DKokkos_HWLOC_DIR=$HWLOC_DIR
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ninja install
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cd ..

‎examples/kokkos/kokkos_build_scripts/kokkos_clang_cuda_build.sh

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#!/bin/bash
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# Install Kokkos w/ sycl-cuda support
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set -x #echo on
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# Set:
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# KOKKOS_INSTALL_DIR=[/your/install/dir]
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# KOKKOS_SOURCE_DIR=[/your/source/dir]
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# HWLOC_DIR=[/your/hwloc/dir]
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# Configure & build kokkos
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mkdir kokkos-build
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cd kokkos-build
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CXXFLAGS="-Xsycl-target-frontend -O3 -fgpu-inline-threshold=100000" \
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LDFLAGS="-Xsycl-target-frontend -O3" \
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cmake $KOKKOS_SOURCE_DIR -G Ninja \
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-DCMAKE_BUILD_TYPE=Release \
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-DCMAKE_CXX_STANDARD=17 \
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-DCMAKE_CXX_COMPILER=clang++ \
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-DCMAKE_INSTALL_PREFIX=$KOKKOS_INSTALL_DIR \
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-DKokkos_CXX_STANDARD=17 \
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-DKokkos_ENABLE_SYCL=OFF \
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-DKokkos_ENABLE_CUDA=ON \
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-DKokkos_ARCH_HSW=ON \
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-DKokkos_ARCH_AMPERE80=ON \
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-DKokkos_ENABLE_HWLOC=ON \
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-DKokkos_ENABLE_UNSUPPORTED_ARCHS=ON \
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-DKokkos_ENABLE_TESTS=OFF \
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-DKokkos_HWLOC_DIR=$HWLOC_DIR
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ninja install
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cd ..

‎examples/kokkos/kokkos_build_scripts/kokkos_nvcc_cuda_build.sh

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#!/bin/bash
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# Install Kokkos w/ sycl-cuda support
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set -x #echo on
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# Set:
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# KOKKOS_INSTALL_DIR=[/your/install/dir]
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# KOKKOS_SOURCE_DIR=[/your/source/dir]
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# HWLOC_DIR=[/your/hwloc/dir]
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# Configure & build kokkos
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mkdir kokkos-build
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cd kokkos-build
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cmake $KOKKOS_SOURCE_DIR -G Ninja \
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-DCMAKE_BUILD_TYPE=Release \
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-DCMAKE_CXX_STANDARD=17 \
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-DCMAKE_CXX_COMPILER=g++ \
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-DCMAKE_CUDA_COMPILER=nvcc \
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-DCMAKE_INSTALL_PREFIX=$KOKKOS_INSTALL_DIR \
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-DKokkos_CXX_STANDARD=17 \
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-DKokkos_ENABLE_SYCL=OFF \
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-DKokkos_ENABLE_CUDA=ON \
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-DKokkos_ARCH_HSW=ON \
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-DKokkos_ARCH_AMPERE80=ON \
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-DKokkos_ENABLE_HWLOC=ON \
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-DKokkos_ENABLE_UNSUPPORTED_ARCHS=ON \
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-DKokkos_ENABLE_TESTS=OFF \
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-DKokkos_HWLOC_DIR=$HWLOC_DIR
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ninja install
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cd ..

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