I think i should solve this problem by specifying random numbers as clock offset between motes,and sim_time() as global time.
On Mon, Nov 16, 2009 at 10:31 PM, mojtaba raznahan < [email protected]> wrote: > Paul, > > Thanks again for your clear answers. > > Yes, I think like you.So due to this issue I can't test time > synchronization algorithms in TOSSIM,am I right ?Or maybe there is some > interface for doing this job .. ? > > sincerley, > Mojtaba > > On Mon, Nov 16, 2009 at 9:58 PM, Paul Johnson <[email protected]> wrote: > >> Mojtaba, >> >> Actually, i believe the bootAtTime is in 100's of pico seconds (10^-10) >> seconds. So 1024 * 10^-10 = 0.0000001024, and apparently sim_time_string() >> returns time in seconds (up to nano seconds (10^-9)). There are actually >> 1024 milli "ticks" per second, so this is why each timer fired is adding not >> quite 1.0 to the time. >> >> As for your other issue, this is actually by design. If a node transmits >> a broadcast packet, all other nodes in the transmission range will receive >> it at the same time. The boot times only change when the node powers up, >> but doesn't skew it's clock. In fact, i can't say for 100%, but I think >> that sim_time_string() grabs the global simulation time, and there is no >> local clock simulation is TOSSIM. >> >> -Paul >> >> mojtaba raznahan wrote: >> >> Hi Janos, >> thanks for reply. >> >> What's the meaning of this numbers ? I set the bootAtTime event as these >> : >> >> *t.getNode(0).bootAtTime(1024); >> t.getNode(1).bootAtTime(1320); >> t.getNode(2).bootAtTime(6000)*; >> >> And i get the time by *"sim_time_string()*" method and it print the boot >> times as this : 0:0:0.000000102 and 0:0:0.000000132 and 0:0:0.000000600 . As >> i can guess 102 means "1024" MilliSec and 132 means "1320" Milil. >> And I set the startPeriodic at 1000 ,some thing is ambiguous.The last >> statement prints the time equal to 0:0:0.000000142 the next statment is * >> Timer.startPeriodic(1000)*,but in the output when i print the time in * >> Timer.fired()* event, it prints the time equal to *0:0:0.976562642* and >> the later *0:0:1.953125142* ,* 0:0:2.929687642*, *0:0:3.906250142* what >> does it mean ? >> And also when i send a packet, the 2 other recievers get the packet at the >> same time!!(I've set the bootTimes differently!). >> >> Thanks, >> Mojtaba >> >> >> >> >> On Mon, Nov 16, 2009 at 7:34 PM, Janos Sallai <[email protected] >> > wrote: >> >>> In tossim, the node object in python has a bootAtTime method which >>> lets you set when the mote boots. You can use this to make the local >>> clock's offsets different from each other. By the way, TOSSIM does not >>> simulate clock skew. This might limit the validity of the simulation >>> results. >>> >>> Janos >>> >>> On Mon, Nov 16, 2009 at 7:55 AM, mojtaba raznahan >>> <[email protected]> wrote: >>> > Hi all, >>> > >>> > I want to know how can I set the local time of each mote >>> programmatically ? >>> > I want to set different local time for each node then test my >>> > synchronization algorithm on them. >>> > I used the LocalTime interface to get the local time but i can't set >>> > different initial local time for each node.And LocalTime interface has >>> 2 >>> > type "TMilli" and "TMicro" but when i use TMicro then in configuration >>> > section there isn't any component provider for it! .I'm using Tinyos >>> 2.1.0 >>> > and TOSSIM. >>> > >>> > Regards, >>> > -- >>> > Mojtaba Raznahan >>> > BS of Computer engineering >>> > TMU university >>> > www.raznahan.com >>> > >>> > _______________________________________________ >>> > Tinyos-help mailing list >>> > [email protected] >>> > >>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>> > >>> >> >> >> >> -- >> Mojtaba Raznahan >> BS of Computer engineering >> TMU university >> www.raznahan.com >> >> ------------------------------ >> _______________________________________________ >> Tinyos-help mailing >> [email protected]https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> >> > > > -- > Mojtaba Raznahan > BS of Computer engineering > TMU university > www.raznahan.com > -- Mojtaba Raznahan BS of Computer engineering TMU university www.raznahan.com
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