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Qwen3.5-MoE CUDA V2 foundation: one model, many isolated sessions #20117

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Qwen3.5-MoE CUDA V2 foundation: one model, many isolated sessions #20117

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76dd40c
[INITIAL] Update
mergennachin Jun 8, 2026
394b0c1
[UPDATE] Update
mergennachin Jun 8, 2026
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4 changes: 3 additions & 1 deletion backends/cuda/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -179,7 +179,9 @@ install(
)

# CUDA backend implementation
set(_aoti_cuda_backend_sources runtime/cuda_backend.cpp)
set(_aoti_cuda_backend_sources runtime/cuda_backend.cpp
runtime/cuda_mutable_state.cpp
)
if(_cuda_is_msvc_toolchain)
# MSVC links aoti_cuda_backend into portable_lib without relying on C++
# symbols exported from aoti_cuda_shims.dll.
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2 changes: 2 additions & 0 deletions backends/cuda/runtime/TARGETS
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Expand Up @@ -105,9 +105,11 @@ runtime.cxx_library(
name = "cuda_backend",
srcs = [
"cuda_backend.cpp",
"cuda_mutable_state.cpp",
],
headers = [
"cuda_delegate_handle.h",
"cuda_mutable_state.h",
],
# @lint-ignore BUCKLINT: Avoid `link_whole=True` (https://fburl.com/avoid-link-whole)
link_whole = True,
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11 changes: 11 additions & 0 deletions backends/cuda/runtime/cuda_backend.cpp
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Expand Up @@ -42,6 +42,7 @@
#include <executorch/backends/aoti/utils.h>
#include <executorch/backends/cuda/runtime/cuda_allocator.h>
#include <executorch/backends/cuda/runtime/cuda_delegate_handle.h>
#include <executorch/backends/cuda/runtime/cuda_mutable_state.h>
#include <executorch/backends/cuda/runtime/platform/platform.h>
#include <executorch/backends/cuda/runtime/shims/memory.h>
#include <executorch/backends/cuda/runtime/utils.h>
Expand Down Expand Up @@ -466,6 +467,10 @@ class ET_EXPERIMENTAL CudaBackend final
kCudaGraphWarmupSteps);
}

// Record whether this AOTI build exposes the constant-management symbols
// needed for per-session mutable-buffer rebinding (CUDA V2 multi-session).
mutable_state_note_handle(handle);

return (DelegateHandle*)handle; // Return the handle post-processing
}

Expand Down Expand Up @@ -514,6 +519,12 @@ class ET_EXPERIMENTAL CudaBackend final
static_cast<int>(device_type));
}

// CUDA V2 multi-session: if a logical session is active on this thread,
// rebind this container's mutable constants (KV/conv/recurrent) to the
// session's own GPU buffers before running. No-op for
// single-session/legacy.
ET_CHECK_OK_OR_RETURN_ERROR(mutable_state_rebind_for_execute(handle));

// ---------------------------------------------------------------
// CUDA graph REPLAY path — skip all tensor setup and just replay
// ---------------------------------------------------------------
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