README
1The Snappy compression format in the Go programming language.
2
3To download and install from source:
4$ go get github.com/golang/snappy
5
6Unless otherwise noted, the Snappy-Go source files are distributed
7under the BSD-style license found in the LICENSE file.
8
9
10
11Benchmarks.
12
13The golang/snappy benchmarks include compressing (Z) and decompressing (U) ten
14or so files, the same set used by the C++ Snappy code (github.com/google/snappy
15and note the "google", not "golang"). On an "Intel(R) Core(TM) i7-3770 CPU @
163.40GHz", Go's GOARCH=amd64 numbers as of 2016-05-29:
17
18"go test -test.bench=."
19
20_UFlat0-8 2.19GB/s ± 0% html
21_UFlat1-8 1.41GB/s ± 0% urls
22_UFlat2-8 23.5GB/s ± 2% jpg
23_UFlat3-8 1.91GB/s ± 0% jpg_200
24_UFlat4-8 14.0GB/s ± 1% pdf
25_UFlat5-8 1.97GB/s ± 0% html4
26_UFlat6-8 814MB/s ± 0% txt1
27_UFlat7-8 785MB/s ± 0% txt2
28_UFlat8-8 857MB/s ± 0% txt3
29_UFlat9-8 719MB/s ± 1% txt4
30_UFlat10-8 2.84GB/s ± 0% pb
31_UFlat11-8 1.05GB/s ± 0% gaviota
32
33_ZFlat0-8 1.04GB/s ± 0% html
34_ZFlat1-8 534MB/s ± 0% urls
35_ZFlat2-8 15.7GB/s ± 1% jpg
36_ZFlat3-8 740MB/s ± 3% jpg_200
37_ZFlat4-8 9.20GB/s ± 1% pdf
38_ZFlat5-8 991MB/s ± 0% html4
39_ZFlat6-8 379MB/s ± 0% txt1
40_ZFlat7-8 352MB/s ± 0% txt2
41_ZFlat8-8 396MB/s ± 1% txt3
42_ZFlat9-8 327MB/s ± 1% txt4
43_ZFlat10-8 1.33GB/s ± 1% pb
44_ZFlat11-8 605MB/s ± 1% gaviota
45
46
47
48"go test -test.bench=. -tags=noasm"
49
50_UFlat0-8 621MB/s ± 2% html
51_UFlat1-8 494MB/s ± 1% urls
52_UFlat2-8 23.2GB/s ± 1% jpg
53_UFlat3-8 1.12GB/s ± 1% jpg_200
54_UFlat4-8 4.35GB/s ± 1% pdf
55_UFlat5-8 609MB/s ± 0% html4
56_UFlat6-8 296MB/s ± 0% txt1
57_UFlat7-8 288MB/s ± 0% txt2
58_UFlat8-8 309MB/s ± 1% txt3
59_UFlat9-8 280MB/s ± 1% txt4
60_UFlat10-8 753MB/s ± 0% pb
61_UFlat11-8 400MB/s ± 0% gaviota
62
63_ZFlat0-8 409MB/s ± 1% html
64_ZFlat1-8 250MB/s ± 1% urls
65_ZFlat2-8 12.3GB/s ± 1% jpg
66_ZFlat3-8 132MB/s ± 0% jpg_200
67_ZFlat4-8 2.92GB/s ± 0% pdf
68_ZFlat5-8 405MB/s ± 1% html4
69_ZFlat6-8 179MB/s ± 1% txt1
70_ZFlat7-8 170MB/s ± 1% txt2
71_ZFlat8-8 189MB/s ± 1% txt3
72_ZFlat9-8 164MB/s ± 1% txt4
73_ZFlat10-8 479MB/s ± 1% pb
74_ZFlat11-8 270MB/s ± 1% gaviota
75
76
77
78For comparison (Go's encoded output is byte-for-byte identical to C++'s), here
79are the numbers from C++ Snappy's
80
81make CXXFLAGS="-O2 -DNDEBUG -g" clean snappy_unittest.log && cat snappy_unittest.log
82
83BM_UFlat/0 2.4GB/s html
84BM_UFlat/1 1.4GB/s urls
85BM_UFlat/2 21.8GB/s jpg
86BM_UFlat/3 1.5GB/s jpg_200
87BM_UFlat/4 13.3GB/s pdf
88BM_UFlat/5 2.1GB/s html4
89BM_UFlat/6 1.0GB/s txt1
90BM_UFlat/7 959.4MB/s txt2
91BM_UFlat/8 1.0GB/s txt3
92BM_UFlat/9 864.5MB/s txt4
93BM_UFlat/10 2.9GB/s pb
94BM_UFlat/11 1.2GB/s gaviota
95
96BM_ZFlat/0 944.3MB/s html (22.31 %)
97BM_ZFlat/1 501.6MB/s urls (47.78 %)
98BM_ZFlat/2 14.3GB/s jpg (99.95 %)
99BM_ZFlat/3 538.3MB/s jpg_200 (73.00 %)
100BM_ZFlat/4 8.3GB/s pdf (83.30 %)
101BM_ZFlat/5 903.5MB/s html4 (22.52 %)
102BM_ZFlat/6 336.0MB/s txt1 (57.88 %)
103BM_ZFlat/7 312.3MB/s txt2 (61.91 %)
104BM_ZFlat/8 353.1MB/s txt3 (54.99 %)
105BM_ZFlat/9 289.9MB/s txt4 (66.26 %)
106BM_ZFlat/10 1.2GB/s pb (19.68 %)
107BM_ZFlat/11 527.4MB/s gaviota (37.72 %)
108