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Device API
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The Device API allows communication to be initiated and performed from device (GPU) code. It is organized into the
following areas:

* **Host-Side Setup** — Creating and configuring device communicators, querying properties, host-accessible device
  pointer functions, and related types.
* **Memory and LSA** — Load/store accessible (LSA) memory, barriers, pointer accessors, and multimem.
* **GIN (GPU-Initiated Networking)** — One-sided transfers, signals, counters, and network barriers.
* **Reduce, Broadcast, and Fused Building Blocks** — Building blocks for computation-fused kernels: reduce, copy
  (broadcast), and reduce-then-copy; used to implement algorithms such as AllReduce, AllGather, and ReduceScatter.

For an introduction and usage examples, see :doc:`Device-Initiated Communication <../usage/deviceapi>`.

.. toctree::
   :maxdepth: 2

   device_setup
   device_memory
   device_gin
   device_reducecopy