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.. Copyright 2013-2023 Lawrence Livermore National Security, LLC and other
Spack Project Developers. See the top-level COPYRIGHT file for details.
SPDX-License-Identifier: (Apache-2.0 OR MIT)
==========================
Using External GPU Support
==========================
Many packages come with a ``+cuda`` or ``+rocm`` variant. With no added
configuration Spack will download and install the needed components.
It may be preferable to use existing system support: the following sections
help with using a system installation of GPU libraries.
-----------------------------------
Using an External ROCm Installation
-----------------------------------
Spack breaks down ROCm into many separate component packages. The following
is an example ``packages.yaml`` that organizes a consistent set of ROCm
components for use by dependent packages:
.. code-block:: yaml
packages:
all:
compiler: [rocmcc@=5.3.0]
variants: amdgpu_target=gfx90a
hip:
buildable: false
externals:
- spec: hip@5.3.0
prefix: /opt/rocm-5.3.0/hip
hsa-rocr-dev:
buildable: false
externals:
- spec: hsa-rocr-dev@5.3.0
prefix: /opt/rocm-5.3.0/
llvm-amdgpu:
buildable: false
externals:
- spec: llvm-amdgpu@5.3.0
prefix: /opt/rocm-5.3.0/llvm/
comgr:
buildable: false
externals:
- spec: comgr@5.3.0
prefix: /opt/rocm-5.3.0/
hipsparse:
buildable: false
externals:
- spec: hipsparse@5.3.0
prefix: /opt/rocm-5.3.0/
hipblas:
buildable: false
externals:
- spec: hipblas@5.3.0
prefix: /opt/rocm-5.3.0/
rocblas:
buildable: false
externals:
- spec: rocblas@5.3.0
prefix: /opt/rocm-5.3.0/
rocprim:
buildable: false
externals:
- spec: rocprim@5.3.0
prefix: /opt/rocm-5.3.0/rocprim/
This is in combination with the following compiler definition:
.. code-block:: yaml
compilers:
- compiler:
spec: rocmcc@=5.3.0
paths:
cc: /opt/rocm-5.3.0/bin/amdclang
cxx: /opt/rocm-5.3.0/bin/amdclang++
f77: null
fc: /opt/rocm-5.3.0/bin/amdflang
operating_system: rhel8
target: x86_64
This includes the following considerations:
- Each of the listed externals specifies ``buildable: false`` to force Spack
to use only the externals we defined.
- ``spack external find`` can automatically locate some of the ``hip``/``rocm``
packages, but not all of them, and furthermore not in a manner that
guarantees a complementary set if multiple ROCm installations are available.
- The ``prefix`` is the same for several components, but note that others
require listing one of the subdirectories as a prefix.
-----------------------------------
Using an External CUDA Installation
-----------------------------------
CUDA is split into fewer components and is simpler to specify:
.. code-block:: yaml
packages:
all:
variants:
- cuda_arch=70
cuda:
buildable: false
externals:
- spec: cuda@11.0.2
prefix: /opt/cuda/cuda-11.0.2/
where ``/opt/cuda/cuda-11.0.2/lib/`` contains ``libcudart.so``.
-----------------------------------
Using an External OpenGL API
-----------------------------------
Depending on whether we have a graphics card or not, we may choose to use OSMesa or GLX to implement the OpenGL API.
If a graphics card is unavailable, OSMesa is recommended and can typically be built with Spack.
However, if we prefer to utilize the system GLX tailored to our graphics card, we need to declare it as an external. Here's how to do it:
.. code-block:: yaml
packages:
libglx:
require: [opengl]
opengl:
buildable: false
externals:
- prefix: /usr/
spec: opengl@4.6
Note that prefix has to be the root of both the libraries and the headers, using is /usr not the path the the lib.
To know which spec for opengl is available use ``cd /usr/include/GL && grep -Ri gl_version``.
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