aamir fayyaz - Page 3 - Developer IT

overriding default scheduler for blkio requests in cgroups

- by Aamir Mushtaq

I am trying to optimize a set of servers that have to reside on single machine. i.e. i can have multiple application server, a DB server and of course a samba server as well in same instance. Now I was looking into several optimizing options available to me. In my quest, i did my tuning of the network stack. coming to the CPU, MEMORY and the BLKIO tweaks, i am using CGROUPS. The problem i am facing is that for enhanced performance in the nature of the applications that i am running, the CFQ Scheduler that is implemented for the BLKIO subsystem is not optimal. I was looking more for a Deadline Scheduler because that will serve my purpose well. My question is whether it is possible for us to change the scheduler in the kernel compilation itself for the BLKIO to Deadline and it will reflect in my usage of [CGROUP hierarchies][3]? Since when running the service cgconf, a new fs is mounted and i dont want it to revert to CFQ scheduler. I also welcome any suggestions that will enable me to have more control over my resources.

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How to ssh to my dorm computer with shared public IP and no admin rights over the router?

- by Aamir

First of all, I am not a Linux or ssh newbie. I have searched for this problem on many forums extensively but nobody seemed to have discussed this. Please help me! I live in a student dorm (off-campus) and all students of the dorm share the same WAN IP (Internet or public IP), which is fortunately static. I am not an admin and have no control over the router that assigns private IP's to all of the students, so I can't really forward port 22 to my computer :( Is it still possible to establish an ssh connection to my dorm computer from a computer on campus?

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How to load previous kernel via ssh?

- by Aamir

I work remotely on my work computer. I am also the root of the workstation that I am sharing with my colleague. Yesterday, I upgraded the kernel to 2.6.31-17 when asked by the update manager but refrained from restarting because I knew my NVIDIA and several other kernel modules wouldn't work. Unfortunately my colleague who is a linux noob restarted the machine and here I am :( I am thinking of changing the symlinks /initrd.img and /vmlinuz to the previous kernel image and use kexec. Please tell some better way to load the 2.6.31-16 release of kernel from ssh and not the grub boot menu. I am using Ubuntu Karmic.

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Error 800 while connecting to VPN

- by Aamir

I am trying to connect to my office network through VPN. It used to work fine earlier but now as soon as I hit connect, I get Error 800: Error 800: Unable to establish VPN Connection. The VPN server may be unreachable, or security parameters may not be configured properly for this connection. I am using Windows XP and I am able to ping the VPN server successfully. I have Symantec Endpoint Protection installed (if it matters). I have tried disabling it as well but nothing changes.

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How to strike out inside LaTeX equations?

- by Aamir

Please see the snippet below and tell me how can I achieve the same strike-out effect as in the main text. I am using the version of LaTeX from the latest Ubuntu repositories. \documentclass{article} \usepackage{ulem} \begin{document} The sout tag works perfect in the \sout{main text area} but not inside the equations. $$ list = [1, \sout{2}, 3, \sout{4}, 5, \sout{6}, 7, \sout{8}, 9, \sout{10}] $$ Any clue? \end{document} Here is LaTeX output

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what is productivity cycle

- by aamir

what is the productivity cycle

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xslt test if a variable value is contained in a node set

- by Aamir

I have the following two files: <?xml version="1.0" encoding="utf-8" ?>  <xas DefaultPolicy="open" DefaultSubjectsFile="subjects.xss"> <rule id="R1" access="deny" object="record" subject="roles/*[name()!='Staff']"/> <rule id="R2" access="deny" object="diagnosis" subject="roles//Nurse"/> <rule id="R3" access="grant" object="record[@id=$user]" subject="roles/member[@id=$user]"/> </xas> and the other xml file called subjects.xss is: <?xml version="1.0" encoding="utf-8" ?> <subjects> <users> <member id="dupont" password="4A-4E-E9-17-5D-CE-2C-DD-43-43-1D-F1-3F-5D-94-71"> <name>Pierre Dupont</name> </member> <member id="durand" password="3A-B6-1B-E8-C0-1F-CD-34-DF-C4-5E-BA-02-3C-04-61"> <name>Jacqueline Durand</name> </member> </users> <roles> <Staff> <Doctor> <member idref="dupont"/> </Doctor> <Nurse> <member idref="durand"/> </Nurse> </Staff> </roles> </subjects> I am writing an xsl sheet which will read the subject value for each rule in policy.xas and if the currently logged in user (accessible as variable "user" in the stylesheet) is contained in that subject value (say roles//Nurse), then do something. I am not being able to test whether the currently logged in user ($user which is equal to say "durand") is contained in roles//Nurse in the subjects file (which is a different xml file). Hope that clarifies my question. Any ideas? Thanks in advance.

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DropdownList autoposback after client confirmation

- by Aamir

I have a dropdownlist with the autopostback set to true. I want the user to confirm if they really want to change the value, which on post back fires a server side event (selectedindexchanged). I have tried adding an onchange attribute "return confirm('Please click OK to change. Otherwise click CANCEL?';") but it will not postback regardless of the confirm result and the value in the list does not revert back if cancel selected. When I remove the onchange attribute from the DropdownList tag, the page does postback. It does not when the onchange attribute is added. Do I still need to wire the event handler (I'm on C# .Net 2.0 ). Any leads will be helpful. Thanks!

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How to Read Device Data From serial port

- by Aamir Khurshid

I have one device which sends data on COM port say on COM13. Now i want to read that data and display it in the RichTextBox or in any text control. I have written the application with the help of IO and IO.Ports but comport.DataRecived event does not fire, even though device is sending data on that port. I have some software on which i define the port number and it successfully display data, which insure me that data is receiving on the Port but i am unable to receive. Is there any way i can read data? comm.Parity = cboParity.Text;//None comm.StopBits = cboStop.Text;//One comm.DataBits = cboData.Text;//8 comm.BaudRate = cboBaud.Text;//9600 comm.DisplayWindow = rtbDisplay;//Null comm.PortName = "COM13"; comm.OpenPort(); cmdOpen.Enabled = false; cmdClose.Enabled = true; cmdSend.Enabled = true; public bool OpenPort() { if (comPort.IsOpen) { comPort.Close(); } comPort.DataReceived += new SerialDataReceivedEventHandler(comPort_DataReceived); comPort.PortName = _portName; comPort.Open();return true; }

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Getting name and type of a struct field from its object

- by Aamir

For example, I have a struct which is something like this: struct Test { int i; float f; char ch[10]; }; And I have an object of this struct such as: Test obj; Now, I want to programmatically get the field names and type of obj. Is it possible? This is C++ BTW.

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Flash AS3 - Scroll dynamic textfield to a specific part just like HTML anchor

- by Aamir Mahmood

Hi, We are building a flash website with cms at the back end, and we are allowing admin to put anchors inside a content. Later we created a smaller version of the whole content to display just a small part and then [read more] button. Which add a new layer on top of every thing acting like a popup and it is populated with complete content. Now we would like to scroll that text inside popup to that portion which [read more] button was clicked. The most common example inside HTMl is go to top link in footer on most of the sites which move the whole document to top. Happy codding.

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