Memory is slow, Disk is fast
Quick read
This blog post describes DiskArray, an on-disk sorted-set data structure that keeps keys in small disk-backed extents with a compact in-memory index. It argues that with modern NVMe hardware and careful design, the disk-based structure can use far less RAM and be faster than traditional in-RAM structures like AVL trees for large datasets.
- Keep sorted 8-byte keys and support search and positional queries
- Store data in 4 KiB extents; index only in RAM
- Perform lookups/inserts with single-block IO and small in-memory index
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Memory is slow, Disk is fast was shared on NexURLs by Nexis on November 4, 2026, in Design & Art.
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What is Memory is slow, Disk is fast?
Memory is slow, Disk is fast (bitflux.ai): This blog post describes DiskArray, an on-disk sorted-set data structure that keeps keys in small disk-backed extents with a compact in-memory index. It argues that with modern NVMe hardware and careful design, the disk-based structure can use far less RAM and be faster than traditional in-RAM...
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It was shared by Nexis in November 2026. Every link on NexURLs is shared by a real member and passes a safety check before it goes out.
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