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NS models must be partitioned for parallelism. NS simulation objects assigned to parallel coordinated sequential sub-schedulers. Integrating NS models into GloMoSim6/%/% 9Conversion Issues Software Structure: NS Uses many small finely grained C++ simulation objects pasted together and controlled with help of the scripting language Tcl. Protocol Layers are broken into many fine grained simulation objects. Complex C++ class hierarchy.$ fConversion Issues Software Structure: GloMoSim More coarse-grained and monolithic. Multi-level scheduler. Parallel Partition Scheduling Network Node Scheduling. Node Event Scheduling. Network Layers are not individual simulation objects. Communication between network layers is done by function calls. H;Nw;Nw  Conversion Issues Basic Differences / Necessary Modifications Packet types/formats (embedded pointer problem). Simulation event scheduler (sending packets, setting timers,etc). Location of objects in simulation architecture (Network versus Application Layer). Layer interface mismatches.$-- Conversion Issues Simulation object parameter setting, control and topology setup (controlled by Tcl in NS). C(Glomo)<--> NS (C++) Interfaces. Misc: Clock type, Random # generators. Low level parallelization issues (no global variables, parallel protocol support). $bO .:.Status of Integration of NS Code into GloMoSim &HNS TCP Layer (prototype done) CMU NS routing protocol code (Latest Beta) Destination Sequence Distance Vector (DSDV) (April 99). Next ->CMU s DSR Protocol (maybe).$J[J[ NS TCP Integration Results  DSDV Integration  Routing protocol executes and produces reasonable routes (checked by hand). In Progress Validation: Under precisely matched NS and GloMoSim test cases, the NSDS routing code produces the same routing protocol packets and route updates.   a  Validation Simulator validation: is the simulation kernel correct, i.e. bug free? Protocol validation Is the protocol model correct wrt its specification? System validation Are consumable resources (e.g., cpu, xmission medium, etc.) modeled accurately Scenario validation Are the traffic, mobility, and other configuration parameters realistic? Methodology validation: Is the simulation experimental methodology followed correctly?15PI?15PI?LyE  Kernel Correctness (PARSEC)  Widely used within UCLA (teaching and research) and worldwide Ported to 11 diferent operating systems Used successfully with very large models Independent validation via port of NS TCP (tahoe)6K h Protocol Validation ZManual validation; detailed program trace, & Simulating known scenarios; phenomena validation Incorporation of operational subsystems in model TCP from Free BSD; RSVP from ISI Rumor replicated file system application Validation with independently developed models: 802.11 in NS vs. 802.11 in GlomosimJKTKS6  TCP over Wireless Study Companion paper in workshop titled GlomoSim Platform Validation  Analytical and Experimental by Gerla et al Validation of simulation model wth analytical model for specific scenario (send and wait for TCP) excellent quantitative and qualitative validation Validate simulations via experimental measurements qualitative validation (e.g. capture effect was seen with both)23@$>r22@L$8( System Validation VChannel models are key!! Impact of different channel models on predicted performanceWW WExecution Efficiency of Models  qDetailed channel models are computationally expensive Significant Speedup for such models with parallel executionrr rScenario Validation   Conclusion \System-level validations suffer from inaccurate knowledge of protocol implementations significant computational load of detailed prop models lack of interaction between application developers, protocol designers, and radio designers. Detailed models are key to improving validation parallel model execution is most beneficial with detailed models6%r%r ]Pb  ` ̙33` ` ff3333f` 333MMM` f` f` 3>?" dZ@$|? " Z@ @5 dd` n?" dZ(@   @@``PR    @ ` ` p>> H@ ( ̄    `$vwawa1 ?P0  A Slide Title      `vwawa1 ?  d"Body Text Second Level Third Level   #  ZFwawa1?  I  d  <1? &d  <1?8   s *DGA  x$PARSEC Workshop 99&    0G&  TUCLA" XB   0DT &B  s *޽h ? a'3e1 0 YQ@( Rh GR   Z5UU1?o_  Page *Z $###55FFp  01 ?   v+  Z46wawa1 ? @ v ;Body Text Second Level Third Level Fourth Level Fifth Level     <  Z6wawa1? @@  ^Notes:( B  s *޽h ? a( 0 N( CotuevnotrteG     Zt5UU1?o_  Page *Z ###55FFB  s *޽h ? a( P0( 0@ x  c $T7p v x  c $7 `   v H  0޽h ?   `$(  r  S t80  v r  S 8  v H  0޽h ? ^WNff3  p 0(   x   c $49P0  v x   c $90  v H   0޽h ? f  0(  x  c $9P0  v x  c $T:  v H  0޽h ? ^WNff3  0( 4 x  c $;P0  v x  c $t;D  v H  0޽h ? f  0( XB x  c $<P0   x  c $T=u   H  0޽h ? ^WNff3  0( B x  c $P0   x  c $   H  0޽h ? f  7/ ( G  x   c $$      Zxaxa1 ?Hh An NS TCP module (tahoe) has been integrated manually to execute using the GloMoSim kernel and network models with the following execution performance:64E    fxaxaA$ ?1 ?%W8 $D 0Mz 8 P s   H H k,$D 0   BDo? s U25% improvementf rB   BDo?8 x rB   BDo?P Mz  0@   0`,$D 0   B o?> z@ U50% improvementf rB   BDo? x@ `rB   BDo?0H   0޽h ? @ ff3Ιd332z  $0(  $x $ c $$ P0   x $ c $    H $ 0޽h ?   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