Tuesday, October 16, 2018

SPARROW theorem and RUM Conjecture

I've found a post in RocksDB blog about the SPAce, Read Or Write (SPARROW) theorem, which states that:
1. Read Amplification (RA) is inversely related to Write Amplification (WA)
2. Write Amplification (WA) is inversely related to Space Amplification (SA)

Seems like the same, but more detailed principles are described in RUM Conjecture paper.

Tuesday, October 9, 2018

Epoch protection

Epoch protection is a technique to avoid expensive synchronization between threads.

[1] Keir Fraser: Practical lock-freedom
[2] Faster: A Concurrent Key-Value Store with In-Place Updates