42ad1dc01e
Add a "HuffmanOnly" compression level, where the input is only entropy encoded. The output is fully inflate compatible. Typical compression is reduction is about 50% of typical level 1 compression, however the compression time is very stable, and does not vary as much as nearly as much level 1 compression (or Snappy). This mode is useful for: * HTTP compression in a CPU limited environment. * Entropy encoding Snappy compressed data, for archiving, etc. * Compression where compression time needs to be predictable. * Fast network transfer. Snappy "usually" performs inbetween this and level 1 compression-wise, but at the same speed as "Huffman", so this is not a replacement, but a good supplement for Snappy, since it usually can compress Snappy output further. This is implemented as level -2, since this would be too much of a compression reduction to replace level 1. >go test -bench=Encode -cpu=1 BenchmarkEncodeDigitsHuffman1e4 30000 52334 ns/op 191.08 MB/s BenchmarkEncodeDigitsHuffman1e5 3000 518343 ns/op 192.92 MB/s BenchmarkEncodeDigitsHuffman1e6 300 5356884 ns/op 186.68 MB/s BenchmarkEncodeDigitsSpeed1e4 5000 324214 ns/op 30.84 MB/s BenchmarkEncodeDigitsSpeed1e5 500 3952614 ns/op 25.30 MB/s BenchmarkEncodeDigitsSpeed1e6 30 40760350 ns/op 24.53 MB/s BenchmarkEncodeDigitsDefault1e4 5000 387056 ns/op 25.84 MB/s BenchmarkEncodeDigitsDefault1e5 300 5950614 ns/op 16.80 MB/s BenchmarkEncodeDigitsDefault1e6 20 63842195 ns/op 15.66 MB/s BenchmarkEncodeDigitsCompress1e4 5000 391859 ns/op 25.52 MB/s BenchmarkEncodeDigitsCompress1e5 300 5707112 ns/op 17.52 MB/s BenchmarkEncodeDigitsCompress1e6 20 59839465 ns/op 16.71 MB/s BenchmarkEncodeTwainHuffman1e4 20000 73498 ns/op 136.06 MB/s BenchmarkEncodeTwainHuffman1e5 2000 595892 ns/op 167.82 MB/s BenchmarkEncodeTwainHuffman1e6 200 6059016 ns/op 165.04 MB/s BenchmarkEncodeTwainSpeed1e4 5000 321212 ns/op 31.13 MB/s BenchmarkEncodeTwainSpeed1e5 500 2823873 ns/op 35.41 MB/s BenchmarkEncodeTwainSpeed1e6 50 27237864 ns/op 36.71 MB/s BenchmarkEncodeTwainDefault1e4 3000 454634 ns/op 22.00 MB/s BenchmarkEncodeTwainDefault1e5 200 6859537 ns/op 14.58 MB/s BenchmarkEncodeTwainDefault1e6 20 71547405 ns/op 13.98 MB/s BenchmarkEncodeTwainCompress1e4 3000 462307 ns/op 21.63 MB/s BenchmarkEncodeTwainCompress1e5 200 7534992 ns/op 13.27 MB/s BenchmarkEncodeTwainCompress1e6 20 80353365 ns/op 12.45 MB/s PASS ok compress/flate 55.333s Change-Id: I8e12ad13220e50d4cf7ddba6f292333efad61b0c Reviewed-on: https://go-review.googlesource.com/20982 Reviewed-by: Joe Tsai <joetsai@digital-static.net> Reviewed-by: Nigel Tao <nigeltao@golang.org> |
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The Go Programming Language
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For documentation about how to install and use Go, visit https://golang.org/ or load doc/install-source.html in your web browser.
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Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set the environment variable $GOROOT to the full path of the go directory (the one containing this file). You can omit the variable if you unpack it into /usr/local/go, or if you rebuild from sources by running all.bash (see doc/install-source.html). You should also add the Go binary directory $GOROOT/bin to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
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