• Brad Fitzpatrick's avatar
    png: speed up opaque RGBA encoding · 437015bb
    Brad Fitzpatrick authored
    With Linux/8g on a 2006 Mac Mini (1.66 GHz Intel Core Duo,
    2KB L1, 2MB L2, 2G main memory), GOMAXPROCS unset:
    
    start:
    png.BenchmarkEncodePaletted	      50	  44772820 ns/op
    png.BenchmarkEncodeRGBOpaque	      10	 208395900 ns/op
    png.BenchmarkEncodeRGBA		       5	 331088000 ns/op
    
    remove interface method calls:
    png.BenchmarkEncodePaletted	      50	  44722880 ns/op
    png.BenchmarkEncodeRGBOpaque	      10	 139042600 ns/op
    png.BenchmarkEncodeRGBA		       5	 334033600 ns/op
    
    flate inline min/max():
    png.BenchmarkEncodePaletted	      50	  40631180 ns/op
    png.BenchmarkEncodeRGBOpaque	      10	 124894900 ns/op
    png.BenchmarkEncodeRGBA		       5	 312099000 ns/op
    
    after adler change:
    png.BenchmarkEncodePaletted	      50	  40181760 ns/op
    png.BenchmarkEncodeRGBOpaque	      20	 121781950 ns/op
    png.BenchmarkEncodeRGBA		       5	 313890800 ns/op
    
    In comparison to 121 ms on this 2006 machine, on my
    Core2 Duo 2.66 GHz laptop, the final BenchmarkEncodeRGBOpaque
    runs in 27 ms. (these are all for 640x480 images)
    
    R=nigeltao, rsc, r
    CC=golang-dev
    https://golang.org/cl/4432077
    437015bb
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