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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

Time Command in Linux

The time command is linux is very much useful if you want to know the time information while running a program or a process.
The time command usage is as followsprompt $] time <commandname>
Example
prompt $] time ls
The output will be
real0m0.002s
user0m0.004s
sys0m0.000s
If you want to see the detailed system parameters occupied during a program or process, then the command will be
prompt$] TIMEFORMAT=”” time -v <commandname>
See the screenshot given below
time command
Time Command in Linux

The output of the above command is
Desktop  Documents  Downloads  examples.desktop  MusicPictures  Public  Templates  Videos
Command being timed: “ls”
User time (seconds): 0.00
System time (seconds): 0.00
Percent of CPU this job got: 400%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.00
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 3600
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 286
Voluntary context switches: 1
Involuntary context switches: 0
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
Similarly, if a C or C++ program is compiled and linked to a file called helloc (the creation of helloc is given below)
prompt $] gcc -o helloc hello.c 
or
prompt $] g++ -o helloc tspradeep.cc 
if you want to execute this command 
 
prompt $] TIMEFORMAT=”” time -v ./helloc
 
The time command will show you the memory page faults, context swtiching, swap memory used and other system parameters, etc.
 
If you have any added input for this command, let you write in the comment section.
T S Pradeep Kumar

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