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add a comment about CUDA_LTO to docs #2879

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Jun 24, 2024
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add a comment about CUDA_LTO to docs #2879

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14 changes: 13 additions & 1 deletion Docs/source/mpi_plus_x.rst
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Expand Up @@ -106,6 +106,19 @@ To enable this, compile with::
to the ``make`` line or ``GNUmakefile``.

.. note::

CUDA 11.2 and later can do link time optimization. This can
increase performance by 10-30% (depending on the application), but
may greatly increase the compilation time. This is disabled by
default. To enable link time optimization, add:

.. code::
CUDA_LTO=TRUE
to the ``make`` line of ``GNUmakefile``.

AMD GPUs
--------

Expand All @@ -123,4 +136,3 @@ Working at Supercomputing Centers
Our best practices for running any of the AMReX Astrophysics codes
at different supercomputing centers is produced in our workflow
documentation: https://amrex-astro.github.io/workflow/