ns-3 Direct Code Execution Lacage (INRIA) ns-3 DCE GEC9 1 / 14
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1 ns-3 Direct Code Execution Lacage (INRIA) ns-3 DCE GEC9 1 / 14
2 Objective Scenario Lacage (INRIA) ns-3 DCE GEC9 2 / 14
3 Objective Scenario VLC Server Wifi STA Router Router Wifi AP VLC Client Lacage (INRIA) ns-3 DCE GEC9 2 / 14
4 Goals Study the impact of wifi routing on video stream quality Lacage (INRIA) ns-3 DCE GEC9 3 / 14
5 Goals Study the impact of wifi routing on video stream quality Develop new wifi adhoc routing protocols Lacage (INRIA) ns-3 DCE GEC9 3 / 14
6 Problem Need simulations: Reproducibility Debuggability Testability Lacage (INRIA) ns-3 DCE GEC9 4 / 14
7 Problem Need simulations: Reproducibility Debuggability Testability Need real-world experiments: Wireless medium realism Lacage (INRIA) ns-3 DCE GEC9 4 / 14
8 Problem Need simulations: Reproducibility Debuggability Testability Need real-world experiments: Wireless medium realism BUT: Must maintain two implementations Lacage (INRIA) ns-3 DCE GEC9 4 / 14
9 Manual Modifications Convert global variables in arrays Lacage (INRIA) ns-3 DCE GEC9 5 / 14
10 Manual Modifications Convert global variables in arrays Convert system calls in simulation calls Lacage (INRIA) ns-3 DCE GEC9 5 / 14
11 Manual Modifications Convert global variables in arrays Convert system calls in simulation calls BUT, does not scale: Painful to do once Impossible to do for software updates Lacage (INRIA) ns-3 DCE GEC9 5 / 14
12 Manual Modifications Convert global variables in arrays Convert system calls in simulation calls BUT, does not scale: Painful to do once Impossible to do for software updates The solution: Direct Code Execution Automate global variable virtualization Automate system call redirection Provide simulation system call replacements Lacage (INRIA) ns-3 DCE GEC9 5 / 14
13 Related Work Network Simulation Cradle: Automated source modifications for C code Hard to extend to C++ Lacage (INRIA) ns-3 DCE GEC9 6 / 14
14 Related Work Network Simulation Cradle: Automated source modifications for C code Hard to extend to C++ Weaves: Automated textual assembly modifications Does not work in practice Lacage (INRIA) ns-3 DCE GEC9 6 / 14
15 Related Work Network Simulation Cradle: Automated source modifications for C code Hard to extend to C++ Weaves: Automated textual assembly modifications Does not work in practice COOJA: Automated memory virtualization Slow Lacage (INRIA) ns-3 DCE GEC9 6 / 14
16 ns-3 DCE Adhoc ELF Loader: Fast Automated memory virtualization Automated system call redirection Lacage (INRIA) ns-3 DCE GEC9 7 / 14
17 ns-3 DCE Adhoc ELF Loader: Fast Automated memory virtualization Automated system call redirection Userspace system calls Lacage (INRIA) ns-3 DCE GEC9 7 / 14
18 ns-3 DCE Adhoc ELF Loader: Fast Automated memory virtualization Automated system call redirection Userspace system calls Kernelspace system calls Lacage (INRIA) ns-3 DCE GEC9 7 / 14
19 Loader Performance Scenario: udp-perf userspace DCE Linux UDP/IP Linux UDP/IP udp-perf userspace DCE Linux UDP/IP kernelspace DCE kernelspace DCE kernelspace DCE PointToPointLink PointToPointLink Lacage (INRIA) ns-3 DCE GEC9 8 / 14
20 Loader Performance Average packets per wall clock second Number of nodes Cooja dlmopen Lacage (INRIA) ns-3 DCE GEC9 9 / 14
21 Loader Performance Average memory usage (KB) Cooja dlmopen Number of nodes Lacage (INRIA) ns-3 DCE GEC9 10 / 14
22 System Performance Average packets per wall clock second 1e dce-none dce-user dce-user+kernel Number of nodes Lacage (INRIA) ns-3 DCE GEC9 11 / 14
23 System Performance Average memory usage (KB) dce-none dce-user dce-user+kernel Number of nodes Lacage (INRIA) ns-3 DCE GEC9 12 / 14
24 Conclusion Reuse existing protocol implementations: Userspace: ping, traceroute, quagga, etc. Kernelspace: IP, TCP, etc. Lacage (INRIA) ns-3 DCE GEC9 13 / 14
25 Conclusion Reuse existing protocol implementations: Userspace: ping, traceroute, quagga, etc. Kernelspace: IP, TCP, etc. Debugging platform: Single debugger controls all protocol instances Lacage (INRIA) ns-3 DCE GEC9 13 / 14
26 Conclusion Reuse existing protocol implementations: Userspace: ping, traceroute, quagga, etc. Kernelspace: IP, TCP, etc. Debugging platform: Single debugger controls all protocol instances Development platform Lacage (INRIA) ns-3 DCE GEC9 13 / 14
27 Conclusion Reuse existing protocol implementations: Userspace: ping, traceroute, quagga, etc. Kernelspace: IP, TCP, etc. Debugging platform: Single debugger controls all protocol instances Development platform Test platform Lacage (INRIA) ns-3 DCE GEC9 13 / 14
28 Future Work Improve userspace API coverage: fork, wait, exec Add X11 connection forwarding More testing Documentation Write paper Lacage (INRIA) ns-3 DCE GEC9 14 / 14
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