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.. _label-heterogeneous-mpi-apps:
Building heterogeneous MPI applications
=======================================
Heterogeneous support (specifically: supporting different sized and/or
represented data types in a single MPI application run) within a
single MPI job is technically required by the MPI standard.
However, there are both theoretical and practical problems with
supporting true data heterogeneity at run-time.
Indeed, it is quite uncommon for production HPC environments to be
data-heterogeneous (e.g., natively support little-endian on some nodes
and big-endian on other nodes in the same MPI application job).
As such, supporting data heterogeneity is a feature that has fallen
into disrepair and is currently known to be broken in this release of
Open MPI.
:doc:`Contributions to fix it would be welcome! </contributing>`
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