Add memory guard to erosion dask paths#1121
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brendancol merged 4 commits intomasterfrom Mar 31, 2026
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Parallel subagent triage + ralph-loop workflow for auditing all xrspatial modules for performance bottlenecks, OOM risk under 30TB dask workloads, and backend-specific anti-patterns.
7 tasks covering command scaffold, module scoring, parallel subagent dispatch, report merging, ralph-loop generation, and smoke tests.
Particle erosion is inherently global and cannot be chunked. Add _check_erosion_memory that estimates ~3x working set (input + brush scratch + output) and raises MemoryError before .compute() when the array won't fit in available RAM.
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Summary
_check_erosion_memorythat estimates ~3x working set and raisesMemoryErrorbefore.compute()when the full grid won't fit in available RAMContext
Found during performance sweep (#1120). Particle erosion is inherently global — particles traverse random paths across the full grid. Can't be chunked. The docstring already documents this, but the code had no guard to prevent the OS OOM killer from stepping in on oversized inputs.
Test plan