[AIMIGRAPHX-] MIGraphX ROCm 7.14 feature port.#53
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The MIGraphX EP synchronized the compute stream after every Compute call (staging, eager, and EPContext paths), forcing a full CPU/GPU serialization per node and destroying inference overlap - worst for graphs partitioned into multiple MIGraphX/other nodes. ORT owns the per-run compute stream (created in CreateSyncStreamForDevice, handed to the kernel via GetGPUComputeStream()) and already flushes it at run end through DeviceStreamCollection::CleanUp -> SyncStream::Flush, honoring the run's sync_stream setting. Intra-run cross-stream ordering is handled by ORT notifications. The EP therefore does not need to sync in the hot path. Also fix OnRunEnd, which synchronized the EP's default stream (stream_) - a stream that never carried compute work, since all kernels run on ORT's compute stream. That sync was both incorrect (wrong stream) and a redundant serialization point, so it is dropped and the now-unused stream_ member is removed. Outputs remain correct: all H2D/compute/D2D work is enqueued on the compute stream in order and ORT flushes it before returning results to the caller.
…ynamic bucket of IO
TedThemistokleous
marked this pull request as draft
July 21, 2026 21:59
apwojcik
approved these changes
Jul 22, 2026
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Porting outstanding items and features from the changes in ROCm 7.14_internal_testing from rocm/Onnxruntime