Ubuntu :: Change Queue Parameters Dynamically During The Simulation Under NS2 Simulator?

Sep 19, 2010

I want to change parameters of a RED queue during the simulation but it seems that some parameters can be modified only before starting the simulation, not dynamically, while the simulation is in progress. For example the following subroutines works before $ns run command but it do not change the behavior of the queue during the simulation( I want to change maxthresh_ and thresh_ after $ns

run command): Code: proc setREDParameters { redQueue MINth MAXth PER_MaxP Wq } {
$redQueue set thresh_ $MINth
$redQueue set maxthresh_ $MAXth


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Software :: Acoustic Simulation Program Or - Sound Wave Simulation Program

Feb 21, 2010

I am looking for a very particular sound wave simulation program. To get an understanding of what i want let me describe it to you in a different way.

Imagine your look at a bowl of water from above and you poke the water at a specific frequency you will see wave patterns showing. Well im after a program that can generate that pattern with any particular frequency that i set, and to allow me to place different shapes and objects around the sound source or sources (i may want to use more than one sound source that may or may not be at the same frequency as first.) and see what kind of reflections i get.

I was also wondering if instead of a point sound source you could have an entire shape giving off a specific vibration. This will give very interesting results that i am also after.

There are some programs that show sound simulations that i have described but nothing that can do the requirements that i desire. Do any of you guys know of any programs that can do this? if not how much would it cost to build such a program?

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General :: Dynamically Change Display Of An Xterm Or Program?

Jul 27, 2010

If I do setenv DISPLAY other_machine:0 and launch a gui application I can send this application to my other_machine Is there any mean (utility or whatever) to send an OPEN application to another machine (by its pid eventually) So if I have an nedit open, and its pid is 13245, I could do something like send_to_display pid=13245 machine=other_machine:0

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General :: Dynamically Change Desktop Background From Bash Script?

Aug 28, 2011

Is it possible to change the GNOME desktop background during some period of time by just a random phrase from the list on black screen? Will is seriously load the CPU and consume battery life?

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Ubuntu :: Change The Background-image With Parameters?

May 31, 2010

I need to do a script to change the background image. I can do this with this command

PHP Code:


that work's fine but i need send some parameters to the background image

1)I need to set the style(mosaic, center, etc)

2)I need to set a color(because the image is smaller than the resolution)

I can't find how set this two parameters

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Ubuntu :: Change Boot Parameters In Grub2?

Aug 10, 2011

I have a mental block whenever I'm confronted with anything to do with grub2. Changing things in menu.lst was SO much simpler....

I want to include the command 'acpi=off' - but where do I put it? Can I change the detail of an existing grub entry in this way, or do I have to create a complete custom menu entry in grub.d and include it in that?

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Software :: Change The Value Of Positional Parameters Inside A File?

Mar 26, 2010

I was wondering if there is a way to change the value of positional parameters inside a file.I mean, i want to change the value of a certain field of a file to the one i provide with?

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Ubuntu :: Change Kernel Time Zone "dynamically" With The Boot Command Not With GUI?

Apr 5, 2010

I found a way to change the kernel time zone with the following command

$ ln -sf /usr/share/zoneinfo/* /etc/localtime

After I tried it and checked the kernel time zone, but it didn't changed.

It seemed to be applied after rebooting.

Is there any way to change the kernel time zone "dynamically" with the

console command, not with the GUI environment?

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Programming :: Get Length Of Run Queue And Swap Queue?

Nov 3, 2010

is it possible to get the length or even the items of both queues, the run queue and the swap queue? I've googled a lot but had no luck. Maybe I havn't used the correct search words...

Is there any header and/or code example to use structures or any API to get these information from the kernel or the scheduler?

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General :: Custom TCP Parameters For Multiple Interfaces - Change The Default Values

Feb 16, 2011

My question is about TCP parameters in Linux. By now, I want to change the default values of:

Initial Timeout
ACK Delay
Idle Connection Timeout

I have a Linux Box with kernel 2.6.x and 2 ethernet interfaces. I know TCP is a stack that doesn't have anything to do with ethernet devices. Said that, the question: is there a way to set custom values for each interface? For example, a server listening to connections in eth0 would use one value for Idle Connection Timeout and another server listening to connections in eth1 could use a different value for that parameter.

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General :: Change The Parameters Of In-built Gspca To Increase The Image Quality?

Mar 24, 2011

I'm using Logitech WebCam on fedora 11 and running webcam server to capture the images on the browser.. it works fine but the image quality is poor...could anyone suggest me how to change the image quality by passing parameters via command line??I tested Video quality on cheese as well, which is poor too..I searched a lot in google for a solution but no use... i got some patch but couldn't install that since the gspca driver on my fedora 11 is in-built..

Output of lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 020: ID 046d:092f Logitech, Inc. QuickCam Express Plus


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Security :: Change Values Of Parameters For Iptables "recent" Match?

Dec 8, 2010

According to the man page, the "recent" match of iptables accepts certain parameters (e.g. "ip_list_tot"). I'd like to change the values of some of them.
All the solutions found on the web were about changing parameters for module, but my kernel was compiled without modules support (such that it can be used for installation booting as well).
How can I change the match parameters for my non-modular kernel ?

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Software :: Tora Simulation Does Not Come To An End In Ns2.34?

Mar 13, 2010

I have successfully changed and configured TORA in ns-2.34 (in fedora 9), as learnt from;[URL]..Now, when I run the simulation, it hangs and does not finish. If the simulation time is 20 seconds, it do completes but for simulation times more than 20 seconds, it never comes to an end.

num_nodes is set 50
Loading scenario file...
Loading connection pattern file...
channel.cc:sendUp - Calc highestAntennaZ_ and distCST_
highestAntennaZ_ = 1.5, distCST_ = 550.0

I have tried increasing the bandwidth and interface queue lengths but got no improvement.Please note that the same TCL scripts are running with other protocols like DSDV, AODV etc

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Ubuntu :: SESC Simulator In 9.04 Version

Aug 2, 2010

do any one have detailed steps to install SESC simulator in ubuntu 9.04?

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Networking :: Changing Bandwidth During A Simulation?

Mar 22, 2010

I'm doing some simulations (using Iperf) to obtain throughputs values of a link between two gigabit ethernet cards for different delays and different drop probability (using netem) .... Now I have to do a 3minute long simulation in which during the firstnute the bandwidth is 1000Mbit/s, 500Mbit/s during the second minute and 1000Mbit/s during ththird one....Does anybody know how can i do this type simulation

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General :: Making Graphs Of A Simulation?

May 28, 2011

making My simulation graphs in Ns-2.34 in ubuntu how i can make them. my simualtion is about Home automation lighting control and i wnated to make 6 graphs1) time VS Residaul energy ( remaining enregy of the nodes)like sensors (we have mentioned Insteon sensor and Switchlinc Dimmer)use 9V battery in them. the 9V should be converted in joules and Energy on Y-axis should be in Joules and time on X-axis should be of simulation timeThe graph would be showing after running the simulation 3000 times how much energy is remaining or how much energy is consumed in the nodes after sending 2000 packets.2) Packet size Vs Delay, Delay on Y-axis and Packet size on X-axis with there units and the graph would be showing if Pacjet size increases how much delay is created.3) Throughput Vs Badwidth. througput on Y-axis and Bandwidth on X-axis4) Packets Loss Vs data rate5) Packets sent Vs data rate6) Packets received Vs data rate

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General :: Wireless Network Simulation Using Ns2?

Mar 10, 2011

im doing my final year project on wireless network simulation using ns2.. how to simulate protocols in ns2.

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Software :: Installing Old Version Of NS2 For ATM Simulation?

Jan 10, 2011

I am currently using Cent OS 5.4 and I was able to successfully install ns 2.34 on the machine and run a few test FTP simulations. The problem stems from the fact that the ns 2 installation used in the ATM simulation , in the link provided, uses ns2.1b7 or ns2.1b9.

I have tried to see if I could cheat and implement the patch for my ns2.34 installation but that failed flat out ( make failed with an incorrect parameter error) I then tried to download the older versions of ns that were used in the ATM Simulation, ns 2.1b9 and that failed too ( otcl make failed with g++ error) which i figured failed because I am using g++ version 4.1 . ( From the docuemntation, this particular version of the software had trouble with any g++ version > 3.2)

a) Is anyone aware of any ATM Simulation patch for the current version of ns i.e. ns 2.34?

b) Is there anyway I can confgure the patch for the ns2.1b9/7 version to work smoothly with the ns2.34 version I have installed?

c) What are the recommendations for me to install the ATM Simulation provided on the URL above.

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Fedora :: Surface Simulation On Screen With Fingers?

Jan 11, 2010

Surface simulation on screen with fingersWhat will be the solution of the captioned topic on Open Source?

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Fedora :: Electric Circuit Simulation Program?

Feb 8, 2011

What is most famous Electric circuit simulation Program in linux?? except egda or xcircuit. I want a good program like proteus in windows.

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Server :: Shell Scripting For Launching A Simulation Job?

Jun 27, 2011

I've been doing Finite Element simulations with the Ansys software for several years now, and recently I have been allowed to use a cluster running on Linux (it's a Sun Grid Engine, or SGE). Since I am quite newbie to this thing, I have read a lot on the internet to get more familiar with the Unix language. I found some example codes which are supposed to launch Ansys and read input files, but it does not work for me. Actually, what I want to do is simple:

1- I need to use Ansys 12.1 in batch mode, with the Academic Research license (which is called "aa_r");

2- The software should then read my input file (which is an APDL command file (in case you are familiar with it..)) and save the database and results in my working directory on the server.

The software is located in the following path:


My working directory:


From what I've found on the web, I have to write a shell script that calls the software and specifies the details (batch mode, license name, input file, ...). Then I have to call this script by using the command "qsub".

Script: myjob.sh


nohup /ansys_inc/v121/ansys/bin/ansys121 -b nolist -p aa_r -j jobname -i jobname.inp -o jobname.out 2>&1 &

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Software :: Will Cognitive Radio Simulation Work On NS-2.34

Jan 20, 2011

Cognitive Radio patch worked with ns-2.31 but when I tried it for ns-2.34 it did not work. Is there a separate patch available for ns-2.34 to support cognitive radio ? Or does it not work with ns-2.34 at all ?

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Fedora :: Universe Simulator For F15?

Jun 3, 2011

I would like to install some good universe simulator on f15.

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Ubuntu :: Fonts Don't Appear In STEP Physics Simulator In Gnome

Dec 31, 2010

I have recently installed the STEP physics simulator in my Ubuntu, I found it excellent, but I faced a big problem: fonts of notes and meters won't appear in the simulation window!Here is how it should be: URL...and here is how it displays:URL...

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Software :: Bandwidth Limiter / Slow Internet Simulation?

Jul 2, 2011

need an easy to use bandwidth limiter / slow Internet simulator to test my websites. I would prefer a per application setting where I can limit, say only the web-brower etc.A GUI would be nice as wel

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General :: Unable To Use The MOVE Simulator

Jun 3, 2010

I am trying to learn using MOVE simulator and getting this problem: In the Traffic Model Generator under Static Mobility I import the MOVE trace file and map file. But when I try to save the tcl script(File->Save or SaveAs) I get the following exceptions: Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string:

at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:458)
at java.lang.Integer.parseInt(Integer.java:499)


As a result the trace file that gets generated is empty.

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General :: Download And Install Ns 2.33 Simulator?

Mar 31, 2010

download and install ns 2.33 simulator?

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Ubuntu Multimedia :: Opengl - Work With The Robocup Simulator - SIMSPARK

Jan 17, 2010

I'm trying to work with the robocup simulator (SIMSPARK), but it doesn't work. Really i don't know why.

The terminal show me the following error and i think that the problem is from UBUNTU and OPENGL :

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Fedora :: Xterm Command - Running Molecular Simulation Software

Jun 17, 2011

I am quite new to Linux and fedora. I am trying to run some molecular simulation software whose shell scripts create X windows with the xterm command. How do I get xterm on Fedora 14?

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Software :: Meaning Of Traffic And IT File Generated After Simulation In CRCN

Mar 2, 2011

How to analyse the IT and Traffic file generated in CRCN simulation? What they represent i.e what is the format?

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