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 _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
