Environment Variables

Environment Variables#

HSA_ENABLE_SDMA#

Possible values:

  • 0:Disabled

  • 1:Enabled (Default Value)

This will enable or disable the use of DMA engines in all copy directions (Host-to-Device, Device-to-Host, Device-to-Device) when using the following APIs: hsa_memory_copy, hsa_amd_memory_fill, hsa_amd_memory_async_copy, hsa_amd_memory_async_copy_on_engine

HSA_ENABLE_PEER_SDMA#

Possible values:

  • 0:Disabled

  • 1:Enabled (Default Value)

This will enable or disable the use of DMA engines for Device-to-Device copies when using the following APIs: hsa_memory_copy, hsa_amd_memory_async_copy, hsa_amd_memory_async_copy_on_engine

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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