My numbers should only be used for relative comparison purpose as djpeg decoding time that I sent also include time to read input file from filessystem. Actual decoding speed may be higher when special modification are done in djpeg application to read input from memory.
Thanks & Regards, Mandeep 2011/6/29 Måns Rullgård <m...@mansr.com> > Vladimir Pantelic <vlado...@gmail.com> writes: > > > Mandeep Kumar wrote: > >> Hi All, > >> > >> I have done some benchmarking on OMAP4 running Ubuntu for various > versions of libjpegs. Benchmarks were collected with > >> modified version of djpeg that prints out ms time taken for decoding. > Sample used for benchmarking is a 12MP image > >> downloaded from a photography website. Here are the results: > > > > ... > > > >> libjpeg-turbo trunk version that has NEON patches (5 runs). * > http://libjpeg-turbo.svn.sourceforge.net/viewvc/libjpeg-turbo/* > >> * Decoding Time for Run 1: 1068 ms > >> Decoding Time for Run 2: 1065 ms > >> Decoding Time for Run 3: 1093 ms > >> Decoding Time for Run 4: 1066 ms > >> Decoding Time for Run 5: 1067 ms > >> *Median Decoding Time: 1067 ms* > > > > One remark: > > > > a 12MP image decoded in 1076ms equals ~12MP/s decoding speed. > > > > decoding a 640x480 MJPEG file on a 1GHz OMAP4 using libavcodec > > gives me an average decoding time per frame of ~10ms which yields: > > > > 640x480/10ms = ~30MP/s > > > > so roughly 2.5 times faster. > > > > Either I am doing something wrong or this libjpeg-turbo is not so turbo. > > Libjpeg (turbo or regular) is full of inefficiencies. I guess they all > add up. > > -- > Måns Rullgård > m...@mansr.com >
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