hi, you mentioned dtosh "data length is set in the TestDhvP.nc/TestDipP.nc when you declare the DisseminationValue/DisseminationUpdate interfaces." can you exactly tell where?
thank you very much silva On Tue, Aug 17, 2010 at 10:01 AM, <[email protected]> wrote: > > > > > ---------- Forwarded message ---------- > From: [email protected] > To: [email protected] > Date: Tue, 17 Aug 2010 09:59:12 -0700 > Subject: Re: Fwd: [Tinyos-help] Dissemination Protocols Comparison > Hi Paul, > > Quoting Omprakash Gnawali <[email protected]>: > > ---------- Forwarded message ---------- >> From: Paul Gildea <[email protected]> >> Date: Fri, Aug 13, 2010 at 12:22 PM >> Subject: [Tinyos-help] Dissemination Protocols Comparison >> To: [email protected] >> >> >> Hello, I am new to tinyos, I am following this tutorial on >> dissemination protocols, DIP/DRIP/DHV >> http://docs.tinyos.net/index.php/Dissemination >> I have created the test application and wish to study the power use of >> the three of the protocols using powertossim z and graph the power >> used by each when values are tuned etc. >> DIP/DHV have three tunable parameters. >> >> The first is the Trickle values. >> >> #define DIP_TAU_LOW (1024L) >> #define DIP_TAU_HIGH (65535L) >> >> The second is data size. >> >> typedef nx_struct dip_data { >> nx_uint8_t data[16]; >> } dip_data_t; >> >> The third is advertisement size >> >> #define DIP_SUMMARY_VALUES_PER_PACKET 2 >> #define DIP_VECTOR_VALUES_PER_PACKET 2 >> >> You can compute the proper size with the following formulas: >> >> DIP_SUMMARY_VALUES_PER_PACKET = (DTOSH_DATA_LENGTH - 5) / 3 >> DIP_VECTOR_VALUES_PER_PACKET = (DTOSH_DATA_LENGTH - 1) / 2 >> >> > You might want to consider the suppression constant INFO_THRESHOLD defined > in Dhv.h. It defines when a node suppresses its own transmission. > > Does DRIP have similar, so I can compare it? You seem to be able to >> change the data size but I have not found where yet. >> > > I believe the current implementation of DRIP lets nodes transmit one > (key,value) at a time randomly. > > I am unsure if this test application is suitable as I have tried with >> both DIP and DHV to measure the power used when changing the data size >> for each. Perhaps I am going about it wrong. For each I changed >> nx_uint8_t data[x] from 0-17 and they all yielded very similar energy >> use, which I will attach. I thought only 1-16 were valid byte sizes so >> am confused as to why 0 and 17 still yield similar values? even >> something like 1000 does, but for 1000000 a fault occurs, >> 'segmentation fault'. I am wondering why all these results are so >> similar? Perhaps more intensive use of leds etc in the program would >> show diverse ranges? Should editing these byte sizes in Dip.h work >> like that? >> > > Leds use a lot of energy compared to a single packet transmission. Did you > try to compare Dhv/Dip without leds (You can turn off leds in > TestDipP.nc/TestDhvP.nc). Even so, I think the packet length plays a little > role in energy consumption (time to transmit one byte once the radio is > already on is only a few micro seconds). The actual saving is the number of > transmisions (how many packets are being sent/how many times the radio is > turned on and off) and the node duty cycles. > > The protocols may not check the value for data size (eg. 1000), I will look > into that and get back to you asap. > > For the other two tunign parameters I am unsure as to what values >> would be useful for my tests. the trickle counter is supposed to be in >> millisecond gradients so is the lower tau 1024 milliseconds and the >> higher tau 65535 milliseconds? The third tuning parameter is >> advertisement size, I am unsure of how to change this based on the >> formulae above, where is dtosh data length etc coming froma nd would >> changing these values be useful for what I hope to achieve, comparing >> the power usage in these three protocols? Thanks >> > > dtosh data length is set in the TestDhvP.nc/TestDipP.nc when you declare > the DisseminationValue/DisseminationUpdate interfaces. > > >> -- >> Paul >> >> > Hope that helps, > > Thanh > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >
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