32 lines
1.2 KiB
Plaintext
32 lines
1.2 KiB
Plaintext
= ChunkyPNG benchmark suite
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This small benchmark suite is intended to test the speed of PNG decoding
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and encoding against different ruby interpreters. You can set the number
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of runs by passing the N environment variable. You can execute them as
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rake task or as standalone script.
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rake benchmark:encoding
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rake benchmark:decoding
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rake benchmark N=10 # Run all of them, using n=10
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Use rvm to simply run the tests against different interpreters. Of course,
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make sure that the chunky_png is installed for all your interpreters.
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rvm 1.8.7,1.9.1,rbx rake benchmark N=10
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== Results
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Some of my benchmark (N=50) result on my 2007 iMac can be found in this gist:
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http://gist.github.com/495323
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== Why is this relevant?
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ChunkyPNG is a pure Ruby library to handle PNG files. Decoding a PNG requires
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a lot of integer math and bitwise operations, and moderate use of the unpack
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method to read binary data. Encoding is a good test for Array#pack, and
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depending on the encoding options, also requires a lot of calculations.
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Therefore, the library is a good benchmark candidate for these methods and
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algorithms. It has been used to improve the Array#pack and String#unpack
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methods in Rubinius.
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