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.. meta::
:description: HSA runtime implementation
:keywords: ROCR, ROCm, library, tool, runtime
.. _environment-variables:
Environment variables
========================
The following table lists the most often used environment variables.
.. list-table:: ROCR environment variables
:header-rows: 1
* - Environment variable
- Possible values
- Description
* - HSA_ENABLE_SDMA
-
* 0: Disabled
* 1: Enabled (default)
- This controls the use of DMA engines in all copy directions (Host-to-Device, Device-to-Host, Device-to-Device) when using the
``hsa_memory_copy``, ``hsa_amd_memory_fill``, ``hsa_amd_memory_async_copy``, ``hsa_amd_memory_async_copy_on_engine`` APIs
* - HSA_ENABLE_PEER_SDMA
-
* 0: Disabled
* 1: Enabled (default)
- This controls the use of DMA engines for Device-to-Device copies when using the ``hsa_memory_copy``, ``hsa_amd_memory_async_copy``, ``hsa_amd_memory_async_copy_on_engine`` APIs
.. note::
The value of ``HSA_ENABLE_PEER_SDMA`` is ignored if ``HSA_ENABLE_SDMA`` is used to disable the use of DMA engines.
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