JavaEWAH
Javaewah
https://code.google.com/p/javaewah/
Compressed variant of the Java bitset class
The bit array data structure is implemented in Java as the BitSet class. Unfortunately, this fails to scale without compression.
JavaEWAH is a word-aligned compressed variant of the Java bitset class. It uses a 64-bit run-length encoding (RLE) compression scheme. It trades-off some compression for better processing speed. It also has a 32-bit version which compresses better, but is not as fast.
In general, the goal of word-aligned compression is not to achieve the best compression, but rather to improve query processing time. Hence, the class tries to save CPU cycles, maybe at the expense of storage. However, the EWAH scheme implemented is always more efficient storage-wise than an uncompressed bitmap as implemented in the BitSet class). Unlike some alternatives, javaewah does not rely on a patented scheme.
Download
http://ftp.debian.org/debian/pool/main/libj/libjavaewah-java/libjavaewah-java_0.6.12.orig.tar.xz
Categories
Licensing
License
Verified by
Verified on
Notes
License
Verified by
Debian: Jakub Adam <jakub.adam@ktknet.cz>
Verified on
11 June 2013
Notes
License: apache-2.0
Leaders and contributors
| Contact(s) | Role |
|---|---|
| JavaEWAH team | contact |
Resources and communication
| Audience | Resource type | URI |
|---|---|---|
| Debian (Ref) (R) | https://tracker.debian.org/pkg/libjavaewah-java | |
| Download | https://github.com/lemire/javaewah |
Software prerequisites
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