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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

Introduction to Linux Kernel

  • The Linux or the unix kernel is just developed under the microkernel architecture…
  • The Microkernel provides only the necessary minimum of functionality (inter process communication and the memory management) and can be accordingly be implemented in a small and compact form. Building on this microkernel, the remaining functions of the operating system are relocated to the autonomous processes communicating with the microkernel via a well defied interface.
  • Generally, microkernel systems have been created whose performance can be improved by the monolithic systems.  Since linux provides slow i386 architecture, so linux is developed using the monolithic design..
  • the code size of linux mainly occupied by the device drivers and similars. on the other hand, the central routines of process and memory management are relatively small and easily understood, with 13000 lines of C code in each
  • Thus LINUX is successfully tries to make use of the advantages of a microkernel architecture without giving up its original monolithic design.
States of a Process

Running – The task is active and running inthe non privileged user mode. This state can be interrupted only when there is a system call or the interrupt.
Interrupt Routine – The interrupt routine becomes active when the hardware signals an exception condition which may be new characters from the keyboard or any other hardware interrupt.
System calls – system calls are initiated by software interrupts
Waiting – the process is waiting for an external event. Eg. waiting for a button press…
Ready – the process is ready to run under the CPU, but some other process is currently running under the cpu.
Return from system call – This state is adopted after the end of the system call or end of the interrupts.

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