mirror of https://github.com/golang/go.git
4de15a5cda
The forwardCopy function could be re-written in asm, and the copyHuff method could probably be rolled into huffmanBlock and copyHist, but I'm leaving those changes for future CLs. compress/flate benchmarks: benchmark old ns/op new ns/op delta BenchmarkDecoderBestSpeed1K 385327 435140 +12.93% BenchmarkDecoderBestSpeed10K 1245190 1062112 -14.70% BenchmarkDecoderBestSpeed100K 8512365 5833680 -31.47% BenchmarkDecoderDefaultCompression1K 382225 421301 +10.22% BenchmarkDecoderDefaultCompression10K 867950 613890 -29.27% BenchmarkDecoderDefaultCompression100K 5658240 2466726 -56.40% BenchmarkDecoderBestCompression1K 383760 421634 +9.87% BenchmarkDecoderBestCompression10K 867743 614671 -29.16% BenchmarkDecoderBestCompression100K 5660160 2464996 -56.45% image/png benchmarks: benchmark old ns/op new ns/op delta BenchmarkDecodeGray 2540834 2389624 -5.95% BenchmarkDecodeNRGBAGradient 10052700 9534565 -5.15% BenchmarkDecodeNRGBAOpaque 8704710 8163430 -6.22% BenchmarkDecodePaletted 1458779 1325017 -9.17% BenchmarkDecodeRGB 7183606 6794668 -5.41% Wall time for Denis Cheremisov's PNG-decoding program given in https://groups.google.com/group/golang-nuts/browse_thread/thread/22aa8a05040fdd49 Before: 3.07s After: 2.32s Delta: -24% Before profile: Total: 304 samples 159 52.3% 52.3% 251 82.6% compress/flate.(*decompressor).huffmanBlock 58 19.1% 71.4% 76 25.0% compress/flate.(*decompressor).huffSym 32 10.5% 81.9% 32 10.5% hash/adler32.update 16 5.3% 87.2% 22 7.2% bufio.(*Reader).ReadByte 16 5.3% 92.4% 37 12.2% compress/flate.(*decompressor).moreBits 7 2.3% 94.7% 7 2.3% hash/crc32.update 7 2.3% 97.0% 7 2.3% runtime.memmove 5 1.6% 98.7% 5 1.6% scanblock 2 0.7% 99.3% 9 3.0% runtime.copy 1 0.3% 99.7% 1 0.3% compress/flate.(*huffmanDecoder).init After profile: Total: 230 samples 59 25.7% 25.7% 70 30.4% compress/flate.(*decompressor).huffSym 45 19.6% 45.2% 45 19.6% hash/adler32.update 35 15.2% 60.4% 35 15.2% compress/flate.forwardCopy 20 8.7% 69.1% 151 65.7% compress/flate.(*decompressor).huffmanBlock 16 7.0% 76.1% 24 10.4% compress/flate.(*decompressor).moreBits 15 6.5% 82.6% 15 6.5% runtime.memmove 11 4.8% 87.4% 50 21.7% compress/flate.(*decompressor).copyHist 7 3.0% 90.4% 7 3.0% hash/crc32.update 6 2.6% 93.0% 9 3.9% bufio.(*Reader).ReadByte 4 1.7% 94.8% 4 1.7% runtime.slicearray R=rsc, rogpeppe, dave CC=golang-dev, krasin https://golang.org/cl/6127064 |
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README
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