> 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.