https://github.com/thekvs/esnappy

Erlang bindings for Google's Snappy compression library.
https://github.com/thekvs/esnappy

erlang snappy-compression-library

Last synced: 28 days ago
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Erlang bindings for Google's Snappy compression library.

• Host: GitHub
• URL: https://github.com/thekvs/esnappy
• Owner: thekvs
• License: other
• Created: 2011-04-11T10:38:15.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2016-06-20T09:38:16.000Z (over 8 years ago)
• Last Synced: 2024-08-04T01:15:39.298Z (4 months ago)
• Topics: erlang, snappy-compression-library
• Language: C++
• Homepage:
• Size: 2.59 MB
• Stars: 24
• Watchers: 3
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
## Description

The **esnappy** library provides Erlang bindings to Google's

[Snappy compression library](http://code.google.com/p/snappy/).

It uses separate OS thread for compression/decompression so it won't

screw up Erlang's VM scheduler while processing large data chunks.

## Erlang Version

The **esnappy** library requires Erlang R14B or later.

## Building

[![Build Status](https://travis-ci.org/thekvs/esnappy.svg?branch=master)](https://travis-ci.org/thekvs/esnappy)

You have to have Snappy library installed on your system so that

compiler can link against it. You can also specify **ESNAPPY_INCLUDE_DIR**

and **ESNAPPY_LIB_DIR** enviroment variables for better control of

paths used to compile and link **esnappy** library.


$ ESNAPPY_INCLUDE_DIR=/usr/local/include ESNAPPY_LIB_DIR=/usr/local/lib ./rebar compile

$ ./rebar eunit



## Perfomance


Erlang R14B02 (erts-5.8.3) [source] [64-bit] [smp:4:4] [rq:4] [async-threads:0] [hipe] [kernel-poll:false]


Eshell V5.8.3  (abort with ^G)

1> code:add_path("ebin").

true

2> {ok, Data} = file:read_file("test/text.txt").

{ok,<<32,32,32,208,155,208,181,208,178,32,208,157,208,

      184,208,186,208,190,208,187,208,176,208,181,208,

      178,208,...>>}

3> {ok, Ctx} = esnappy:create_ctx().

{ok,<<>>}

4> {ST, {ok, SCompressed}} = timer:tc(esnappy, compress, [Ctx, Data]).

{46692,

 {ok,<<217,192,187,1,84,32,32,32,208,155,208,181,208,178,

       32,208,157,208,184,208,186,208,190,208,187,...>>}}

5> {ZT, ZCompressed} = timer:tc(zlib, zip, [Data]).

{493585,

 <<172,189,203,110,37,219,145,37,56,207,175,56,17,147,146,

   10,78,126,64,196,128,227,4,106,212,104,52,...>>}

6> size(Data).

3072089

7> size(SCompressed).

1548017

8> size(ZCompressed).

832898



Note the difference in execution time **46692** (Snappy) vs. **493585** (zlib).