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cupla Install Guide

Requirements

Compile an example

cd <path/to/cupla>
mkdir build && cd build
cmake .. -Dcupla_BUILD_EXAMPLES=ON -D<ACC_TYPE>=ON
cmake --build .
# execute an example
# (parameters must be a multiple of 32!)
example/CUDASamples/matrixMul/matrixMul -wA=320 -wB=320 -hA=320 -hB=320
  • list of supported ACC_TYPEs
    • alpaka_ACC_CPU_B_SEQ_T_OMP2_ENABLE
    • alpaka_ACC_CPU_B_SEQ_T_THREADS_ENABLE
    • alpaka_ACC_CPU_B_TBB_T_SEQ_ENABLE
    • alpaka_ACC_GPU_CUDA_ENABLE
    • alpaka_ACC_GPU_HIP_ENABLE
    • alpaka_ACC_CPU_B_OMP2_T_SEQ_ENABLE (only allowed in combination with CUPLA_KERNEL_OPTI and CUPLA_KERNEL_ELEM, because the blockSize must be dim3(1,1,1)) see TuningGuide.md

The CMake argument cupla_ALPAKA_PROVIDER controls which alpaka is used. If the value is internal (default), the alpaka, ship with cupla is used. If the value is external, am installed aplaka via find_package() is used.

Use cupla in your Project

cupla offers two ways to use it in your project via CMake.

  1. You can install it and use it via find_package()
  2. You can add the cupla project to your project and use it with add_subdirectory().

Install Cupla (find_package method)

The installation of cupla requires an installed version of alpaka. You can install the alpaka version in the cupla directory (recommended) or install aplaka directly from source. Attention, there is no warning if you overwrite an existing alpaka installation.

cd <path/to/alpaka>
mkdir build && cd build
cmake ..
cmake --build .
cmake --install .

cupla can be installed via

cd <path/to/cupla>
mkdir build && cd build
cmake ..
cmake --build .
cmake --install .

To check your installation, you can activate the examples (see section compiling an example) during the configuration of cupla and check whether it compiles. Activating the examples does not change anything in the installed cupla library.

# use external alpka to verify your environment
cmake .. -Dcupla_BUILD_EXAMPLES=ON -Dcupla_ALPAKA_PROVIDER="external"

If cupla is installed, you can use it via find_package() in your project:

cmake_minimum_required(VERSION 3.22.0)
project(exampleProject)

find_package(cupla)

cupla_add_executable(${PROJECT_NAME} main.cpp)

add_subdirectory

For the method add_subdirectory() you have to copy the cupla project folder into your project. After that you can add cupla to your project and use it.

cmake_minimum_required(VERSION 3.22.0)
project(exampleProject)

# requires, that cupla is located in the root directory of your project
add_subdirectory(cupla)

cupla_add_executable(${PROJECT_NAME} main.cpp)

Via the CMake variable cupla_ALPAKA_PROVIDER you can decide whether you want to use the alpaka ship with cupla (-Dcupla_ALPAKA_PROVIDER="interal") or an installed version of alpaka (-Dcupla_ALPAKA_PROVIDER="external" - uses find_package(alpaka)).

How to update alpaka as git subtree?

# git author is generic to not mess up contribution statistics
GIT_AUTHOR_NAME="Third Party" GIT_AUTHOR_EMAIL="crp-git@hzdr.de" \
 git subtree pull --prefix alpaka \
 https://github.com/alpaka-group/alpaka.git develop --squash

How to commit local changes to alpaka upstream?

If your local alpaka version contains changes you want to contribute back upstream via fork, then you can use git subtree push:

# Add your fork of alpaka to git remotes
git remote add alpaka-fork git@github.com:YOUR_NAME/alpaka.git

# Push your changes to your fork
git subtree push --prefix=alpaka alpaka-fork

Then check your github page of your fork to open a pull request upstream.

More information can be found in this git subtree guide.