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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

Databases for Soft Real Time System

In disk based scheduling, the disks are located and traced by traversing the sectors and tracks. Tracks are concentric circles and sectors are just originating from the center of the disks.
So, disk scheduling algorithms are slower when compared with the memory based scheduling. Under disk based scheduling
Ta=Tw+Tp+Tt
Ta is the access time
Tw is the time spent in queue
Tp is the time to position the arm to locate the sectors and track
Tt is the time taken to transfer the block of data.
Since Tp is in the order of few milliseconds, but CPU time is hardly around 50nano seconds, so disk based scheduling algorithms are not suitable for hard real time systems. However these algorithms, can be made useful for soft real time systems. Disk based scheduling will be useful for Soft Real time system based on the following algorithms
First Come First Serve (FCFS)

The task or transaction which comes first will be scheduled and then the next, here the main problem is if the requests are huge then this algorithm is not suitable.
Elevator or Scan policy

Scans in one direction and serves the requests, if not then comes to starting position and runs again from the beginning. In the following diagram, the requests are dark lines and servings are given in dotted arrow lines. In this first case, the order of servings will be 3,4,5,9,1,1,2 (as 3,4,5,9 are over, it comes back to its position and starts from 1 and 1 and then 2) the other method will be scans in one direction and serves the requests, if not reverse the direction and serves the request and comes to starting position and then starts for the next cycle . The following example depicts both. In this the order of serving will be 3,4,5,9,2,1,1 (after 3,4,5 and9, the servings are reversing, so that 2,1,1) or the third method will be allocation of priority to requests. But who will give and how to set priority to the new requests.




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