2009/8/12 Omprakash Gnawali <[email protected]> > On Tue, Aug 11, 2009 at 9:31 AM, Rémi Villé<[email protected]> wrote: > > 2009/8/11 Rémi Villé <[email protected]> > >> > >> 2009/8/10 Omprakash Gnawali <[email protected]> > >>> > >>> On Mon, Aug 10, 2009 at 7:14 AM, Rémi Villé<[email protected]> > wrote: > >>> > 2009/8/6 Rémi Villé <[email protected]> > >>> >> > >>> >> 2009/8/6 Rémi Villé <[email protected]> > >>> >>> > >>> >>> Hi, > >>> >>> > >>> >>> I would like to count the number of transmissions/retransmissions > >>> >>> during > >>> >>> a simulation with TOSSIM. > >>> >>> For now, I only need to write this count on stdout using gdb(), but > I > >>> >>> dont know where is the ideal place to add it, I would like to > >>> >>> estimate the > >>> >>> number of (re)transmissions with as much accuracy as possible. > >>> >>> > >>> >>> Thanks, > >>> >>> > >>> >>> Rémi > >>> >> > >>> >> It's dbg(). > >>> > > >>> > I must do that because I have modified the CtpRoutingEngine to use > node > >>> > to > >>> > node similarity, and if I count the number of transmission using only > >>> > Send.sendDone (of CollectionC.CollectionSenderC), I have not the > total > >>> > number of retransmission/retransmission... > >>> > >>> You can put your debug statements in the AM layer. > >>> > >>> - om_p > >> > >> I didn't find exactly where to put the dbg statement in the AM layer > yet, > >> but maybe it would be a better idea to measure the data throughput > (packets > >> per second delivered) in the java application, it may be equivalent and > >> costless for nodes in a future real deployment test. > > > > I think the good place to put the dbg statement is in "event void > > Model.sendDone(message_t* msg, error_t result){...}" in the > > tos/lib/tossim/TossimActiveMessageC.nc file, but I'm not sure it includes > > Ack and re-transmissions... > > > > CTP retransmissions are done using the AM layer: each retransmission > is a new packet as far as the AM layer is concerned. As long as you > instrument the AM layer, you should catch all the retransmissions. > > - om_p >
Thanks for your help, I think I can distinguish ack and other transmission thanks to tossim_metadata_t* metadata = getMetadata(msg); and metadata->ack != 0 It's not a crucial question for me now, but is there a parameter in tossim_metadata_t, tossim_header_t or tossim_footer_t which can allow me to distinguish transmissions and re-transmissions? Rémi
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