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An Erlang NIF wrapper for Google's snappy compressor/decompressor
C++ Erlang C
branch: master

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c_src
src Forgot to bump the app file
test Added additional tests for multiple compress / decompress and
.gitignore remove the use of autotools, doesn't work so well when embedding snappy
Makefile rebar now calls the build script. rebar update.
README.md
rebar Update rebar executable.
rebar.config
rebar.config.script Support big-endian builds

README.md

snappy-erlang-nif

This is an Erlang NIF for Google's snappy fast compressor and decompressor.

Google snappy's official repository and bug tracking system is at:

Its source is included in this project.

site

https://github.com/fdmanana/snappy-erlang-nif

performance tests

Snappy is much faster than zlib's deflate compression, specially for reasonably large amounts of data. Here follow a few basic tests.

Erlang R14B02 (erts-5.8.3) [source] [smp:2:2] [rq:2] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.8.3  (abort with ^G)
1> code:add_path("ebin").
true
2> {ok, J} = file:read_file("../seatoncouch/doc_11k.json").
{ok,<<"{\n\"data3\":\"ColreUHAtn8iYvHIHw2ohiAuaXNGNX9WhlwANGDBYKYs6YEvHXgFXRkWuYoFyfLVqtjZNPedtukWRDXFz7VUOl4APLS7GB9Nw"...>>}
3>
3> timer:tc(snappy, compress, [J]).
{4365,
 {ok,<<"úZðÔ{\n\"data3\":\"ColreUHAtn8iYvHIHw2ohiAuaXNGNX9WhlwANGDBYKYs6YEvHXgFXRkWuYoFyfLVqtjZNPedtukWRDXFz7VUO"...>>}}
4> timer:tc(snappy, compress, [J]).
{115,
 {ok,<<"úZðÔ{\n\"data3\":\"ColreUHAtn8iYvHIHw2ohiAuaXNGNX9WhlwANGDBYKYs6YEvHXgFXRkWuYoFyfLVqtjZNPedtukWRDXFz7VUO"...>>}}
5> timer:tc(snappy, compress, [J]).
{113,
 {ok,<<"úZðÔ{\n\"data3\":\"ColreUHAtn8iYvHIHw2ohiAuaXNGNX9WhlwANGDBYKYs6YEvHXgFXRkWuYoFyfLVqtjZNPedtukWRDXFz7VUO"...>>}}
6> timer:tc(snappy, compress, [J]).
{112,
 {ok,<<"úZðÔ{\n\"data3\":\"ColreUHAtn8iYvHIHw2ohiAuaXNGNX9WhlwANGDBYKYs6YEvHXgFXRkWuYoFyfLVqtjZNPedtukWRDXFz7VUO"...>>}}
7> timer:tc(snappy, compress, [J]).
{113,
 {ok,<<"úZðÔ{\n\"data3\":\"ColreUHAtn8iYvHIHw2ohiAuaXNGNX9WhlwANGDBYKYs6YEvHXgFXRkWuYoFyfLVqtjZNPedtukWRDXFz7VUO"...>>}}
8> timer:tc(snappy, compress, [J]).
{111,
 {ok,<<"úZðÔ{\n\"data3\":\"ColreUHAtn8iYvHIHw2ohiAuaXNGNX9WhlwANGDBYKYs6YEvHXgFXRkWuYoFyfLVqtjZNPedtukWRDXFz7VUO"...>>}}
9>
9> timer:tc(zlib, zip, [J]).
{1025,
 <<237,88,217,142,226,88,18,125,175,175,104,241,108,89,
   119,95,234,13,39,24,179,153,37,49,182,25,181,...>>}
10> timer:tc(zlib, zip, [J]).
{753,
 <<237,88,217,142,226,88,18,125,175,175,104,241,108,89,
   119,95,234,13,39,24,179,153,37,49,182,25,181,...>>}
11> timer:tc(zlib, zip, [J]).
{974,
 <<237,88,217,142,226,88,18,125,175,175,104,241,108,89,
   119,95,234,13,39,24,179,153,37,49,182,25,181,...>>}
12> timer:tc(zlib, zip, [J]).
{753,
 <<237,88,217,142,226,88,18,125,175,175,104,241,108,89,
   119,95,234,13,39,24,179,153,37,49,182,25,181,...>>}
13> timer:tc(zlib, zip, [J]).
{960,
 <<237,88,217,142,226,88,18,125,175,175,104,241,108,89,
   119,95,234,13,39,24,179,153,37,49,182,25,181,...>>}
14> timer:tc(zlib, zip, [J]).
{769,
 <<237,88,217,142,226,88,18,125,175,175,104,241,108,89,
   119,95,234,13,39,24,179,153,37,49,182,25,181,...>>}
15>
15> byte_size(element(2, snappy:compress(J))).
2846
16> byte_size(zlib:zip(J)).
1858
17>
17> crypto:start().
ok
18> Large = base64:encode(crypto:rand_bytes(100 * 1024)).
<<"72GMvPLuWJLJeYSlNm9oNkYkbjTeSBDgTrqamQ/zgj7hcUge1co6LvldJyitKPZkMPQGnrN98EyqSyWto3k7ShNgiNc05Gt4zdXSbTVSDzeID661DnJX"...>>
19>
19> timer:tc(snappy, compress, [Large]).
{365,
 {ok,<<216,170,8,244,255,127,55,50,71,77,118,80,76,117,
       87,74,76,74,101,89,83,108,78,109,57,...>>}}
20> timer:tc(snappy, compress, [Large]).
{541,
 {ok,<<216,170,8,244,255,127,55,50,71,77,118,80,76,117,
       87,74,76,74,101,89,83,108,78,109,57,...>>}}
21> timer:tc(snappy, compress, [Large]).
{455,
 {ok,<<216,170,8,244,255,127,55,50,71,77,118,80,76,117,
       87,74,76,74,101,89,83,108,78,109,57,...>>}}
22> timer:tc(snappy, compress, [Large]).
{479,
 {ok,<<216,170,8,244,255,127,55,50,71,77,118,80,76,117,
       87,74,76,74,101,89,83,108,78,109,57,...>>}}
23>
23> timer:tc(zlib, zip, [Large]).
{14666,
 <<20,155,181,118,195,64,20,5,63,72,133,152,74,49,147,197,
   234,196,204,236,175,143,115,210,164,112,188,...>>}
24> timer:tc(zlib, zip, [Large]).
{19716,
 <<20,155,181,118,195,64,20,5,63,72,133,152,74,49,147,197,
   234,196,204,236,175,143,115,210,164,112,188,...>>}
25> timer:tc(zlib, zip, [Large]).
{14561,
 <<20,155,181,118,195,64,20,5,63,72,133,152,74,49,147,197,
   234,196,204,236,175,143,115,210,164,112,188,...>>}
26> timer:tc(zlib, zip, [Large]).
{21683,
 <<20,155,181,118,195,64,20,5,63,72,133,152,74,49,147,197,
   234,196,204,236,175,143,115,210,164,112,188,...>>}
27> timer:tc(zlib, zip, [Large]).
{11575,
 <<20,155,181,118,195,64,20,5,63,72,133,152,74,49,147,197,
   234,196,204,236,175,143,115,210,164,112,188,...>>}
28>
28> byte_size(element(2, snappy:compress(Large))).
136554
29> byte_size(zlib:zip(Large)).
103440
30>
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