Guard flow_path_dinf() against unbounded memory allocations (#1363)#1367
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brendancol merged 1 commit intomainfrom Apr 29, 2026
Merged
Guard flow_path_dinf() against unbounded memory allocations (#1363)#1367brendancol merged 1 commit intomainfrom
brendancol merged 1 commit intomainfrom
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The numpy and cupy branches allocate ~24 B/pixel of working memory (input float64 cast, start-points float64 cast, output) with no check against available host RAM. A 50000x50000 float64 grid asks for ~60 GB of working memory and triggers the OOM killer rather than raising a clean error. The cupy branch additionally round-trips through host memory before reallocating on device. Add `_check_memory` and `_check_gpu_memory` helpers (24 B/px CPU, 32 B/px GPU, 50% threshold) and call them from the public dispatch on the eager numpy and cupy branches. Dask paths skip the guard -- per-tile allocations are bounded by the user's chunk size.
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Fixes #1363.
Summary
_check_memoryand_check_gpu_memoryhelpers toflow_path_dinf.py(24 B/px CPU, 32 B/px GPU, 50% threshold) modelled on the flow_length_d8/dinf/mfd guards.flow_path_dinf()dispatch on the eager numpy and cupy branches before the float64 casts. Dask paths skip the guard.Why
The numpy and cupy branches allocate ~24 B/pixel of working memory with no check against host RAM. A 50000x50000 float64 grid asks for ~60 GB of working memory and triggers the OOM killer rather than raising a clean MemoryError.
Test plan
pytest xrspatial/hydro/tests/test_flow_path_dinf.py-- 21 passed (16 existing + 5 new guard tests)