Paul, I guess that my help is not going to be that useful for you, anyway I will point a few things that sometimes one may forget:
a) Check XScale's libraries and/or coding recommendations. That might be done in: http://download.intel.com/design/intelxscale/31628302.pdf http://download.intel.com/design/intelxscale/31451001.pdf b) Go through your code and optimize it. I know that it is easier to say than actually doing it. c) Check your operating clock frequency. In the event that you are using the one by default in iMote-TinyOS2 (13MHz) be aware that you may raise it up to 400-500 MHz. For further info, go to tinyos2-contrib. There is a folder with specific scripts for compilation that may substitute the regular ones so that you can rise it and/or use 32Mbyte for data rather than just 256Kbytes. We experienced some trouble months ago while using 32Mbytes, but can't really say that it was a code bug. Supposedly, it works. Good luck, Nelson On 11/04/2010 05:10 PM, Paul Joonhwa Shin wrote: > > Hi Nelson, > > Consulting your technical report, I set up an Imote2 development > environment by installing your pre-built arm-none-eabi 4.3.3 deb package > to use iwMMXt instuction set. And, then I ran my blob tracking > application, which continuously captures and processes 320x240 gray > images while sending the center of mass of the object. > > I compared the capturing rate between on (1) arm-none-eabi 4.3.3 > environment and on (2) regular xscale-elf environment. > The average time for image capture and processing on (1) was about > 500ms, while the average time on (2) was about 600ms. > So, there's an improvement, but just a little. > > Do you have any ideas to optimize it further? > > Thanks, > Paul > > > > Paul Joonhwa Shin wrote: >> Hi Nelson, >> >> Thank you so much for your information. I would try that out to see >> the integer-based SIMD mode is automatically enabled by default. >> >> Thanks, >> Paul >> >> >> >> Nelson Dopico wrote: >>> Hello Paul, >>> >>> As far as I know, SIMD mode is part of iwMMXt instruction set, >>> therefore you need enable at least iwMMXt -- consequently, you will >>> require an eabi compiler rather than elf. I am unaware how to "force" >>> the compiler to generate SIMD operations in specific sections of your >>> code unless you code partially in assembler -- supposing that you are >>> programming in C/C++. I guess that it must be enabled by default as >>> long as you use integers and you specify the iwmmxt instruction set >>> as it is pointed in section 4.2 of the technical report. >>> >>> Anyway, check out these two links >>> >>> http://download.intel.com/design/intelxscale/31628302.pdf >>> >>> http://download.intel.com/design/intelxscale/31451001.pdf >>> >>> Good luck! >>> >>> Nelson >>> >>> >>> On 10/26/2010 04:36 PM, Paul Joonhwa Shin wrote: >>>> Hi Nelson, >>>> >>>> I looked at your post, and found it is well-documented and looks very >>>> useful. >>>> >>>> I scanned through your technical report, and have a question. So, are >>>> you saying that basically it is possible to operate integers in SIMD >>>> mode with iwMMXt instruction set? Could you give me some more >>>> information about how to actually use it in programming and how to >>>> enable it? I am particularly interested in SIMD mode since I am trying >>>> to do some image processing on Imote2. >>>> >>>> Thanks, >>>> Paul >>>> >>>> >>>> >>>> Nelson Dopico wrote: >>>>> Hello Paul! >>>>> >>>>> You may find useful to include a reference to debian packages that >>>>> have no conflicts with micaz toolchain instalations. Check this post >>>>> for further information: >>>>> http://www.gaps.ssr.upm.es/en/research/wsn/138-compiling-for-an-arm-architecture-imote2-tinyos >>>>> >>>>> >>>>> >>>>> Cheers, >>>>> >>>>> Nelson >>>>> >>>>> >>>>>> Date: Mon, 25 Oct 2010 12:54:05 -0400 >>>>>> From: Paul Joonhwa Shin <[email protected]> >>>>>> Subject: [Tinyos-help] [Info] A complete Imote2 installation & >>>>>> programming guide on Ubuntu >>>>>> To: TinyOS - Help <[email protected]> >>>>>> Message-ID: <[email protected]> >>>>>> Content-Type: text/plain; charset=UTF-8; format=flowed >>>>>> >>>>>> Hello, >>>>>> >>>>>> I am a PhD student at Purdue. I just want to contribute to this >>>>>> community with >>>>>> my hands-on experience for imote2 installation & programming. >>>>>> >>>>>> After struggling a month or so, I could finally set up all >>>>>> environments for >>>>>> Imote2 programming on Ubuntu 10.04. >>>>>> >>>>>> Although I found more than ten web pages, describing their successful >>>>>> configuration and installation procedures, they are missing some >>>>>> problem >>>>>> cases >>>>>> that I encountered. >>>>>> >>>>>> So I made a web page that contains my experience and my own >>>>>> procedures that >>>>>> worked on Ubuntu 10.04. Of course, most of them are from other >>>>>> existing >>>>>> sources >>>>>> but I also include things that I have never found on the web >>>>>> including this >>>>>> community. >>>>>> >>>>>> In addition, I just collected useful resources from other web pages. >>>>>> So you >>>>>> could browse almost all available sources on a single page. I of >>>>>> course put >>>>>> where they are from. >>>>>> >>>>>> I hope it would be useful for newbies like whom I was. >>>>>> >>>>>> Paul's Guide: >>>>>> http://web.ics.purdue.edu/~paulshin/research_Imote2.html >>>>>> >>>>>> Thanks, >>>>>> Paul Joonhwa Shin >>>>>> >> > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
