Top 7.0% forks on proxy.golang.org
proxy.golang.org : gitlab.com/cznic/zappy
Package zappy implements the zappy block-based compression format. It aims for a combination of good speed and reasonable compression. Zappy is a format incompatible, API compatible fork of snappy[1]. The C++ snappy implementation is at [2]. The snappy compression is pretty good. Yet it has one problem built into its format definition[3] - the maximum length of a copy "instruction" is 64 bytes. For some specific usage patterns with long runs of repeated data, it turns out the compression is suboptimal. For example a 1:1000 "sparseness" 64kB bit index with only few set bits is compressed to about 3kB (about 1000 of 64B copy, 3 byte "instructions"). Zappy uses much less complicated format than snappy. Each encoded block begins with the uvarint-encoded[4] length of the decoded data, followed by a sequence of chunks. Chunks begin and end on byte boundaries. The chunk starts with a varint encoded number N: Compression rate is roughly the same as of snappy for the reference data set: Zappy has better RLE handling (1/1000+1 non zero bytes in each index): When compiled with CGO_ENABLED=1, zappy is now faster than Go snappy. Old=Go snappy, new=zappy: The package builds with CGO_ENABLED=0 as well, but the performance is worse. If a constraint 'purego' appears in the build constraints [5] then a pure Go version is built regardless of the $CGO_ENABLED value. ... referenced from the above documentation.
Registry
-
Source
- Documentation
- JSON
purl: pkg:golang/gitlab.com/cznic/zappy
License: BSD-3-Clause
Latest release: almost 2 years ago
First release: over 6 years ago
Namespace: gitlab.com/cznic
Stars: 1 on GitLab.com
Forks: 1 on GitLab.com
See more repository details: repos.ecosyste.ms
Last synced: 9 days ago