fastmap · research

FastMap

FastMap is a research redesign of Linux's memory-mapped I/O path that targets synchronization bottlenecks in multicore storage workloads.

Design: per-core structures and separate clean/dirty tracking reduce shared contention. [1]

Scope: prototype evaluation, not a stock Linux feature or a transaction guarantee. See the companion source review for benchmark-label limitations. [2]

Relations

related

memory-mapped-file, page-cache, msync, direct-io

Advantages

• Reduces contention in the evaluated mapping path.

Limitations

• Performance depends on implementation, workload and device.

Citations

1. Papagiannis et al., Optimizing Memory-mapped I/O for Fast Storage Devices, USENIX ATC 2020, sections 3-5 (accessed 2026-10-18)
2. Hesela: mmap literature and FastMap benchmark scope (accessed 2026-10-18)

JSON: /data/terms/fastmap.json