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CUDA: Allow concurrent streams per split for multi-GPU (#28198) CUDA: Allow CUDA optimization per split for multi-GPU. Previous guard caused multi-GPU to skip the graph optimization. The graph is already split per device and the optimization doesnt run over the whole model but once per split, and thus should be allowed. However, the CUDA event ggml_cuda_concurrent_event belongs to whichever GPU was "current" when created. If the pass ran while GPU 0 was current, it would stick and during event creation for the second GPU it would land on GPU 0. The fix: set the device explicitly ggml_cuda_set_device(cuda_ctx->device); Default behaviour remains unchanged, only active for GGML_CUDA_GRAPH_OPT=1. Explicit device setting pattern re-used from ggml_backend_cuda_graph_compute. Update ggml/src/ggml-cuda/ggml-cuda.cu Co-authored-by: Aman Gupta amangupta052@gmail.com Co-authored-by: tannerbruhn tannerbruhn@users.noreply.github.com Co-authored-by: Aman Gupta amangupta052@gmail.com Website: https://llama.app Attestations: https://github.com/ggml-org/llama.cpp/attestations/44959687 macOS/iOS: macOS Apple Silicon (arm64) macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED macOS Intel (x64) iOS XCFramework Linux: Ubuntu x64 (CPU) Ubuntu arm64 (CPU) Ubuntu s390x (CPU) Ubuntu x64 (Vulkan) Ubuntu arm64 (Vulkan) Ubuntu x64 (ROCm 10.0) Ubuntu x64 (OpenVINO) Ubuntu x64 (SYCL FP32) Ubuntu x64 (SYCL FP16) Android: Android arm64 (CPU) Windows: Windows x64 (CPU) Windows arm64 (CPU) Windows arm64 (OpenCL Adreno) Windows x64 (CUDA 12) - CUDA 12.4 DLLs Windows x64 (CUDA 13) - CUDA 13.3 DLLs Windows arm64 (CUDA 13) (preview) - CUDA 13.4 DLLs Windows x64 (Vulkan) Windows x64 (OpenVINO) Windows x64 (SYCL) Windows x64 (ROCm 10.0) openEuler: DISABLED openEuler x86 (310p) openEuler x86 (910b, ACL Graph) openEuler aarch64 (310p) openEuler aarch64 (910b, ACL Graph) UI: UI

Source: llama.cpp Releases | 2026-09-03

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