Native GPU fixed-step path (Phase B): OpenACC integration without runtime CoreNEURON - #3801

Draft

nrnhines wants to merge 51 commits into

hines-grok/feature/neuron-core-gpu-adoption

Commits on Jun 8, 2026

update coding-conventions (prints black version)
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acc726e
build: make format-pr more robust
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80a93a4
Merge branch 'master' into hines/black-format
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cd41f7c

Commits on Jun 19, 2026

Add NRN_ENABLE_GPU and NRN_GPU_BACKEND CMake options (GPU adoption step 1)

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GPU adoption step 1b: document CMAKE_CUDA_ARCHITECTURES in options.rst

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270919a
GPU adoption step 2: fix ringtest GPU MPI ctest NVHPC loader issue

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1ef4465
GPU adoption step 3: propagate OpenACC compile+link to libnrniv

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bed18a4

Commits on Jun 20, 2026

GPU adoption step 4: add neuron::gpu offload scaffold

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4d94ca7
GPU adoption step 5: device_token lifecycle and NrnThread GPU fields

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92286d9
GPU adoption step 6: default NMODL_NEURON_CODEGEN for GPU builds

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GPU adoption step 7: enable solve_interleaved GPU dispatch scaffolding

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847b565
GPU adoption step 8: NMODL NEURON OpenACC codegen visitor

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688144b
Fix step 8 file headers: drop Blue Brain copyright, EOF newlines

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233d517
GPU adoption step 9: SOA and InterleaveInfo device upload (MVP)

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GPU adoption step 10: native psolve dispatch scaffolding

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GPU adoption step 11: host-side network event stages (Phase B1)

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GPU adoption step 12: end-to-end native psolve scaffolding (G4 subset)

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3a6955d
GPU adoption step 13: ringtest native GPU benchmark harness

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0ba3ace

Commits on Jun 21, 2026

GPU adoption step 14: MPI multi-GPU device assignment

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0100ec7
GPU adoption step 15: Python GPU API consolidation + MKL guard

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GPU adoption step 16: test stabilization (ringtest spk2, backend_helper copies)

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GPU adoption PR 7b: OpenACC setup_tree_matrix in treeset.cpp

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0dd2d05
GPU adoption PR 11b+16: net_send GPU buffer + gap/VecPlay sync

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a225a10
Fix GPU test failures: upload parent index, hybrid host/device sync

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a6c488e
Fix native GPU fast_imem sync for pointer modtests

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8795cd5
Enable GPU axial matrix assembly and GPU solve_interleaved on native path

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41ce001
Run GPU post-solve voltage update and fast_imem on device

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b6bad25
Upload padded Memb_list shells for native GPU mechanism path

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574b22a
Add batch GPU download API for Vector.record and graph flush

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e0037c4
Expand G4 native GPU modtests to full _py_gpu parity (PR 19)
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e2eddbf
Reject native GPU when CVode is active (Phase B boundary)
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ff48b5e
Stabilize GPU ctest harness for pytest modtests (Phase B)
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Document native GPU threading and spike/NET_RECEIVE policy (Phase B)
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e800b0f
Add native GPU fixed-step Sphinx scope contract (PR6 / Phase B)
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Add native GPU adoption dev journal and Phase B closure (PR7)
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Fix PR7 commit hash in dev journal appendix
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Clarify native GPU timestep diagram: GPU mech currents and post_solve fallback
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Document sparse13/DAE as unsupported on native GPU matrix solve
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Refine native GPU docs: tree solve, subphase table, ODE-only diagram
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Clarify native GPU diagram preconditions and gap transfer phases
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Merge branch 'master' into hines-grok/feature/neuron-core-gpu-adoption
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91a7db6
Merge remote-tracking branch 'origin/hines/black-format' into hines-grok/feature/neuron-core-gpu-adoption
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88b4366
ninja format-pr
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e6ddbae

Commits on Jun 22, 2026

Fix CPU-only builds when NRN_ENABLE_GPU=OFF
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352bb6b
Fix NVHPC warnings in native GPU build sources
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35f0822
Fix CPU builds: declare hoc_register_net_send_buffering for NMODL codegen
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a34dc84
Enable NRN_ENABLE_GPU in NVHPC CI for native GPU pre-merge proof

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fc81dcb

Commits on Jun 23, 2026

Fix NVHPC build: use routine seq in solve_interleaved2_loop_body

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4053d97

Commits on Jun 24, 2026

Require cell permute type 2 when native GPU is enabled

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8fe0e92
Fix native GPU with gap junctions via CPU fixed-step fallback
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39dd87d

Commits on Jun 25, 2026

Document native GPU gap junction CPU fixed-step fallback
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9874a5b