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.. meta::
:description: rocPRIM documentation and API reference library
:keywords: rocPRIM, ROCm, API, documentation
.. _dev-config:
********************************************************************
Configuring the Kernels
********************************************************************
A kernel config is a way to select the grid/block dimensions, but also
how the data will be fetched and stored (the algorithms used for
``load`` and ``store``) for the operations using them (such as ``select``).
.. doxygenstruct:: rocprim::kernel_config
Setting the configuration is important to better tune the kernel to a given GPU model.
``rocPRIM`` uses a placeholder type to let the macros select the default configuration for
the GPU model
.. doxygenstruct:: rocprim::default_config
.. warning::
To provide information about the GPU you're targeting, you have to
set ``ROCPRIM_TARGET_ARCH``.
If the target is not supported by ``rocPRIM``, the templates will
use the configuration for the model ``900``.
If ``ROCPRIM_TARGET_TARGET`` is not defined, it defaults to ``0``,
which is not supported by ``rocPRIM`` and thus the configurations
will be for the model ``900``.
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