PutToLocalFile and FileStorage::OffloadObjects crash with SIGSEGV when
slice.ptr points to GPU device memory, because CPU memcpy cannot access
GPU virtual addresses. The RDMA memory-replica path is unaffected.
Add synchronous Device-to-Host staging via PinnedBufferPool before data
reaches the disk-write paths:
- New gpu_staging_utils.h: shared IsDevicePointer/CopyDeviceToHost/
SetDevice helpers with cross-platform support (CUDA/HIP/MUSA/MACA/
Ascend CANN)
- New PinnedBufferPool: thread-safe pinned host memory pool with
max capacity limit (default 32) and O(1) swap-pop acquire
- PutToLocalFile: sync D2H on calling thread, PutRevoke on failure
- OffloadObjects: D2H staging before BatchOffload; on per-slice failure
the entire object is skipped to prevent partial/corrupt data
- CMakeLists: auto-detect CUDAToolkit/HIP/Ascend independently of
global USE_CUDA flag, with explicit PRIVATE compile definitions
- CI: add -lcudart to Go test CGO_LDFLAGS when CUDA is present
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Colors-111