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Installing ns-3.37 and ns-3.35 in Ubuntu | Ubuntu 22.04 | NS3

Multiple Versions of ns3 in Ubuntu 22.04 In this post, we are going to install two versions of ns3 namely ns-3.35 and ns-3.37  My OS is : Ubuntu 22.04 LTS (Long Term Support) ns-3.35 uses waf and (./waf --run scratch/first)  ns-3.37 uses cmake  (./ns3 run scratch/first.cc) So we will install both the packages  Go through the video for complete instructions To start with  $ sudo apt update  $ sudo apt install build-essential autoconf automake libxmu-dev g++ python3 python3-dev pkg-config sqlite3 cmake python3-setuptools git qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools gir1.2-goocanvas-2.0 python3-gi python3-gi-cairo python3-pygraphviz gir1.2-gtk-3.0 ipython3 openmpi-bin openmpi-common openmpi-doc libopenmpi-dev autoconf cvs bzr unrar gsl-bin libgsl-dev libgslcblas0 wireshark tcpdump sqlite sqlite3 libsqlite3-dev  libxml2 libxml2-dev libc6-dev libc6-dev-i386 libclang-dev llvm-dev automake python3-pip libxml2 libxml2-dev libboost-all-dev  I have downloaded both the versions of ns3 fr

Main Algorithms of a kernel…

Timer Interrupts

  • There is one hardware timer that generates interrupts every 10ms and all the software timer synchronizes with it.
  • Usually the timer stored in the variable jiffies.

unsigned long volatile jiffies;

The variable jiffies is modified by the timer interrupt every 10ms and hence it is declared as volatile.

volatile struct timeval xtime:

This is the actual time which again modified by the timer interrupt

Other functions of timer interrupt like

do_timer();

updates the jiffies

timer_bh();

updates the timer and processing of the timer related functions

update_process_time();

collects data for the scheduler and decides whether it has to be scheduled.

 

The Scheduler

schedule () is function declared in kernel/sched.c

The actions of the scheduler is given below, once the schedule() function is called,

  • Upcoming software interrupts are processed (so interrupts are given higher priority over the other entities in the system)
  • process with highest priority determined (if two tasks has equal priority, then the OS will determine which task to be executed first.)
  • real time process takes over normal ones. (Real time processes area associated with deadlines, whereas the normal ones doesn’t have deadlines, this factor is determined by the rt_priority of the schedule structure)
  • new process becomes current process. (whenever a process is getting scheduled by the scheduler, then it will become the current process)

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