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Add MMapAllocator that allocates memory via mmap-backed files on a configurable path (e.g. NVMe/SSD). This enables placing secondary data structures on SSD while keeping primary data in RAM, reducing heap memory usage for large-scale vector search. - include/svs/core/allocator_mmap.h: MMapAllocator with configurable base path, access hints (Sequential/Random/Normal), and automatic file cleanup on deallocation. - tests/svs/core/test_allocator_mmap.cpp: Unit tests for allocation, deallocation, file creation, and access hint propagation. - tests/CMakeLists.txt: Register mmap allocator test.
ibhati
requested review from
razdoburdin and
rfsaliev
and removed request for
razdoburdin and
rfsaliev
- Add map_existing_at_offset() to MMapAllocationManager for read-only file mapping with byte offset (skips file headers) - Add use_existing_file() one-shot override to MMapAllocator so allocate() maps an existing binary file instead of creating a temp file - Propagate override fields through copy constructor - Enables zero-copy loading of saved index data without intermediate allocate-copy cycles, significantly reducing memory usage
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Add MMapAllocator that allocates memory via mmap-backed files on a configurable path (e.g. NVMe/SSD). This enables placing secondary data structures on SSD while keeping primary data in RAM, reducing heap memory usage for large-scale vector search.