2 code implementations • 5 Feb 2019 • Daniel Lemire, Owen Kaser, Nathan Kurz
Currently, the remainder of the division by a constant is computed from the quotient by a multiplication and a subtraction.
Mathematical Software Performance
6 code implementations • 25 Sep 2017 • Daniel Lemire, Nathan Kurz, Christoph Rupp
To surpass varint-G8IU, we present Stream VByte, a novel byte-oriented compression technique that separates the control stream from the encoded data.
15 code implementations • 22 Sep 2017 • Daniel Lemire, Owen Kaser, Nathan Kurz, Luca Deri, Chris O'Hara, François Saint-Jacques, Gregory Ssi-Yan-Kai
Compressed bitmap indexes are used in systems such as Git or Oracle to accelerate queries.
Databases
3 code implementations • 23 Nov 2016 • Wojciech Muła, Nathan Kurz, Daniel Lemire
Most processors have dedicated instructions to count the number of ones in a word (e. g., popcnt on x64 processors).
Data Structures and Algorithms
2 code implementations • 20 Feb 2015 • Jeff Plaisance, Nathan Kurz, Daniel Lemire
We consider the ubiquitous technique of VByte compression, which represents each integer as a variable length sequence of bytes.
4 code implementations • 24 Jan 2014 • Daniel Lemire, Leonid Boytsov, Nathan Kurz
We can use the SIMD instructions available in common processors to boost the speed of integer compression schemes.
Information Retrieval Databases Performance
