Reland [OpenMP][libomptarget] Enable parallel copies via multiple SDM… (#72307)
…A engines (#71801)
This enables the AMDGPU plugin to use a new ROCm 5.7 interface to
dispatch asynchronous data transfers across SDMA engines.
The default functionality stays unchanged, meaning that all data
transfers are enqueued into a H2D queue or an D2H queue, depending on
transfer direction, via the HSA interface used previously.
The new interface can be enabled via the environment variable
`LIBOMPTARGET_AMDGPU_USE_MULTIPLE_SDMA_ENGINES=true` when libomptarget
is built against a recent ROCm version (5.7 and later). As of now,
requests are distributed in a round-robin fashion across available SDMA
engines.
GitOrigin-RevId: 5c22b907dc557d739d5141fad04acac9c97c09b9
1 file changed
