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  • Performance Overhead of Perf Event Subsystem in Linux Kernel

    - by Bo Xiao
    Performance counters for Linux are a new kernel-based subsystem that provide a framework for all things performance analysis. It covers hardware level (CPU/PMU, Performance Monitoring Unit) features and software features (software counters, tracepoints) as well. Since 2.6.33, the kernel provide 'perf_event_create_kernel_counter' kernel api for developers to create kernel counter to collect system runtime information. What I concern most is the performance impact on overall system when tracepoint/ftrace is enabled. There are no docs I can find about them. I was once told that ftrace was implemented by dynamically patching code, will it slow the system dramatically?

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  • AtomicSwap instead of AtomicCompareAndSwap ?

    - by anon
    I know that on MacOSX / PosiX systems, there is atomic-compare-and-swap for C/C++ code via g++. However, I don't need the compare -- I just want to atomically swap two values. Is there an atomic swap operation available? [Everythign I can find is atomic_compare_and_swap ... and I just want to do the swap, without comparing]. Thanks!

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  • Ubuntu: Graphics freeze

    - by Phil
    We have recently updated a java application which runs on an Ubuntu PC, and are now experiencing a graphics problem that we didn't encounter before. The system is running constantly, and randomly maybe twice a month but sometimes within a few days the systems graphics will freeze, and the gnome panels are frozen. Here is an extract from the syslog; Jun 28 05:41:53 swimtag-NM10 kernel: [34802.970021] [drm:i915_hangcheck_elapsed] ERROR Hangcheck timer elapsed... GPU hung Jun 28 05:41:53 swimtag-NM10 kernel: [34802.970177] [drm:i915_do_wait_request] ERROR i915_do_wait_request returns -5 (awaiting 937626 at 937625)

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  • Big, Thick Reference Books (PHP / MySQL / Unix) [closed]

    - by Josh K
    I'm looking for in-depth reference books / guides in PHP, MySQL, and Unix. I'm aware there other other questions pertaining to good books for short references of function names, or detailed beginner guides to these systems. I'm looking for something different. I want a book that I can either use as a quick but in-depth (decent write up, not a pocket reference guide) reference to common functions (JOINS, string manipulation, Regular Expressions, etc) while also providing a detailed inner workings explanation on the system itself.

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  • to get columns from Excel files using Apache POI??

    - by posdef
    Hi, In order to do some statistical analysis I need to extract values in a column of an Excel sheet. I have been using the Apache POI package to read from Excel files, and it works fine when one needs to iterate over rows. However I couldn't find anything about getting columns neither in the API (link text) nor through google searching. As I need to get max and min values of different columns and generate random numbers using these values, so without picking up individual columns, the only other option is to iterate over rows and columns to get the values and compare one by one, which doesn't sound all that time-efficient. Any ideas on how to tackle this problem? Thanks,

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  • How to programatically create and read WEP/EAP WiFi configurations in Android?

    - by Als
    How to programatically create and read WEP/EAP WiFi configurations in Android? I have seen a number of people struggling on this very question on various forums and all across the community. I know this is not that straight forward(especially EAP) to figure out because When I wanted to acheive the same I too struggled quite a lot.Well, all the hard work of code analysis and searching various implementations on the internet done with I was finally able to acheive the goal. All the credit goes to number of open source projects and their developers. I would like to share this knowledge with all, Since SO encourages this: "It's also perfectly fine to ask and answer your own question, as long as you pretend you're on Jeopardy: phrase it in the form of a question." Part 1: Creating a WEP WiFi configuration programatically. Part 2: Read a WEP WiFi configuration programatically. Part 3: Read a EAP WiFi Configuration programatically. Part 4: Save a EAP WiFi configuration programatically.

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  • Screening (multi)collinearity in a reggresion model

    - by aL3xa
    I hope that this one is not going to be "ask-and-answer" question... here goes: (multi)collinearity refers to extremely high correlations between predictors in the regression model. How to cure them... well, sometimes you don't need to "cure" collinearity, since it doesn't affect regression model itself, but interpretation of an effect of individual predictors. One way to spot collinearity is to put each predictor as a dependent variable, and other predictors as independent variables, determine R2, and if it's larger than .9 (or .95), we can consider predictor redundant. This is one "method"... what about other approaches? Some of them are time consuming, like excluding predictors from model and watching for b-coefficient changes - they should be noticeably different. Of course, we must always bare in mind specific context/goal of analysis... Sometimes, only remedy is to repeat a research, but right now, I'm interested in various ways of screening redundant predictors when (multi)collinearity occurs in a regression model.

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  • Add up values from a text file

    - by Stanley
    Hi Guys I have a text file that contains Amounts at Substring (34, 47) of each line. I need to sum Up all the Values to the End of the File. I have this code that I had started to build but I do not know how to proceed from here: public class Addup { /** * @param args the command line arguments */ public static void main(String[] args) throws FileNotFoundException, IOException { // TODO code application logic here FileInputStream fs = new FileInputStream("C:/Analysis/RL004.TXT"); BufferedReader br = new BufferedReader(new InputStreamReader(fs)); String line; while((line = br.readLine()) != null){ String num = line.substring(34, 47); double i = Double.parseDouble(num); System.out.println(i); } } } The output is like this: 1.44576457E4 2.33434354E6 4.56875685E3 The Amount is in two decimal Places and I need the result also in the Two decimal Places. What Is the Best way to achieve this?

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  • How to make Visual C++ 9 not emit code that is actually never called?

    - by sharptooth
    My native C++ COM component uses ATL. In DllRegisterServer() I call CComModule::RegisterServer(): STDAPI DllRegisterServer() { return _Module.RegisterServer(FALSE); // <<< notice FALSE here } FALSE is passed to indicate to not register the type library. ATL is available as sources, so I in fact compile the implementation of CComModule::RegisterServer(). Somewhere down the call stack there's an if statement: if( doRegisterTypeLibrary ) { //<< FALSE goes here // do some stuff, then call RegisterTypeLib() } The compiler sees all of the above code and so it can see that in fact the if condition is always false, yet when I inspect the linker progress messages I see that the reference to RegisterTypeLib() is still there, so the if statement is not eliminated. Can I make Visual C++ 9 perform better static analysis and actually see that some code is never called and not emit that code?

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  • Java resource management: please help to understand Findbugs results.

    - by java.is.for.desktop
    Hello, everyone! Findbugs bugs me about a method which opens two Closeable instances, but I can't understand why. Source public static void sourceXmlToBeautifiedXml(File input, File output) throws TransformerException, IOException, JAXBException { FileReader fileReader = new FileReader(input); FileWriter fileWriter = new FileWriter(output); try { // may throw something sourceXmlToBeautifiedXml(fileReader, fileWriter); } finally { try { fileReader.close(); } finally { fileWriter.close(); } } } Findbugs analysis Findbugs tells me Method [...] may fail to clean up java.io.Reader [...] and points to the line with FileReader fileReader = ... Question Who is wrong: me or Findbugs?

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  • Screen capture during testing

    - by Edwward
    This is an application for reviewing performance tests. Simple in concept, tricky to describe. Picture: 1) Recording interactions with a WPF program so the inputs can be played back. 2) Playing the inputs back while doing a continuous screen capture. 3) Capturing wall time as well as continuous CPU percentages during playback. 4) Repeating steps (2) and (3) lots of times. 5) Writing the relevant stuff out to files/db. 6) Reading it and putting it all in a fancy UI for easy review/analysis. The killer for me is (2). I could use some guidance on a good, possibly commercial, screen capture SDK. I would also welcome the news that my whole problem already has a solution. And of course any thoughts on the overall idea would also be great. Thanks. Ed

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  • Sharing authentication between forum and main CMS in Rails

    - by Newy
    I have a Rails forum product that resides under the subdomains of my customers (i.e. http://forum.customer.com). Their main site has a CMS and an authentication system, and my forum product has a separate authentication system. Is there an elegant way to have "cross-signins" across these systems? I want someone already logged into the main CMS to seamlessly (as possible) transition into my product.

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  • Custom membership provider via WCF authorization question

    - by Diego
    I've made a global authentication via WCF to use with the most of our systems, but found that load data via WCF not very so fast. What I need to do now is verify every time that the page is loading if the user has access granted to that page.... Its a good pratice to go back in WCF request this info for every page that the user access?This will not slow down my entire system?

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  • Start app from within python

    - by Aaron Hoffman
    Hello, I'm trying to start an application using Python. I've seen that some people use startfile but I also read that it only works with Windows. I'm using Mac systems and hoping for it to work with them. Thanks, Aaron

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  • Have you switched from CodeIgniter to Kohana?

    - by Eli
    Hi All, I usually just work with straight PHP, but want to try MVC and see if a framework will really speed up development. After much waffling, analysis paralysis, and many dumb SO questions, I thought I had settled on CodeIgniter for my next PHP project. However, I am now seriously considering Kohana. Has anyone made the switch from CI to Kohana? If so, why? What's better about the actual code, libraries, etc? Edit: Hi All, I did end up going with Kohana. It's easy to use, but more importantly, it's easy NOT to use, since there are a lot of things I like to work with native PHP for. It's ridiculously extensible, well coded, and seems like it is beginning to pull out ahead of CI in a few things like putting views in views, passing subview data, etc. I am sure CI will catch up, but Kohana should be 3 steps ahead by then =o)

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  • Passion to learn

    - by rajivpradeep
    Hi, I want to learn C , UNIX and LINUX, and more about embedded systems. Very much interested in them. Are there any online courses or websites which can guide me. And please suggest books to read in learning them. Thanks for your time.

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  • Making a program platform independent

    - by Thilanka
    Hi, I'm working with an OCR project which is developed using Visual C++ on .net framework. But since the .net is platform dependent I want to make this project platform independent and make it supports to multiple operating systems. So can some one give me a hint to how to do it. Thanks.

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  • Processing an n-ary ANTLR AST one child at a time

    - by Chris Lieb
    I currently have a compiler that uses an AST where all children of a code block are on the same level (ie, block.children == {stm1, stm2, stm3, etc...}). I am trying to do liveness analysis on this tree, which means that I need to take the value returned from the processing of stm1 and then pass it to stm2, then take the value returned by stm2 and pass it to stm3, and so on. I do not see a way of executing the child rules in this fashion when the AST is structured this way. Is there a way to allow me to chain the execution of the child grammar items with my given AST, or am I going to have to go through the painful process of refactoring the parser to generate a nested structure and updating the rest of the compiler to work with the new AST? Example ANTLR grammar fragment: block : ^(BLOCK statement*) ; statement : // stuff ; What I hope I don't have to go to: block : ^(BLOCK statementList) ; statementList : ^(StmLst statement statement+) | ^(StmLst statement) ; statement : // stuff ;

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  • Java development in Ubuntu

    - by Veera
    I'm a newbie to Linux systems and recently I started using Ubuntu 10.04. When I do java development in Windows, I usually keep my project files under some drive (D: for example) and under my development folder, such as D:\projects\myproj. But I'm bit confused with Ubuntu's folder structure. So, I just want to know how do you organize your projects in Ubuntu? Under which folder do we keep our projects file?

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  • R: including model specifications in xtable(anova(...))

    - by HamiltonUlmer
    Hello R comrades: I have a bunch of loglinear models, which, for our purposes will just be glm() objects called mx, my, mz. I want to get a nicely-formatted xtable of the analysis of deviance, so naturally I would want to perform xtable(anova(mx, my, mz, test = "Chisq")). The vanilla output of xtable, however, doesn't include the model specifications. I'd like to include those for all the ANOVA tests I'm running, so if there is not a param I'm missing that does this I'll probably just have to hack up my own solution. But looking over the help page, there doesn't seem to be an easy way to include the model specifications. Any thoughts? Alternatives? If it helps this was done in 2.9.1 with xtable 1.5-5.

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  • Adding animation to my images with JQuery

    - by slandau
    Here is my home page: <%@ Page Language="C#" MasterPageFile="~/Views/Home/Home.Master" Inherits="System.Web.Mvc.ViewPage" %> <asp:Content ID="Content2" ContentPlaceHolderID="IndicationContentPlaceHolder" runat="server"> <table id="home" style="margin-left: auto; margin-right:auto;"> <td id="homeLinks"> <div style="padding-left:35px;" id="homeListing" class="containerMid"> <div id="homeView"> <table style="margin-left: auto; margin-right:auto;"> <tr> <tr> <td id="btnIcOld" style="text-align:center;cursor:pointer;"> <img src="<%= VirtualPathUtility.ToAbsolute("~/img/chic/Load.png")%>" /> </td> <td id="btnIc" style="text-align:center;cursor:pointer;"> <img src="<%= VirtualPathUtility.ToAbsolute("~/img/chic/Bar_Chart.png")%>" /> </td> <td id="btnPricing" style="text-align:center;cursor:pointer;"> <img src="<%= VirtualPathUtility.ToAbsolute("~/img/chic/Pie_Chart_disabled.png")%>" /> </td> <td id="btnSheets" style="text-align:center;cursor:pointer;"> <img src="<%= VirtualPathUtility.ToAbsolute("~/img/chic/Line_Chart_disabled.png")%>" /> </td> <td id="btnPort" style="text-align:center;cursor:pointer;"> <img src="<%= VirtualPathUtility.ToAbsolute("~/img/chic/Modify_disabled.png")%>" /> </td> <td id="btnAdmin" style="text-align:center;cursor:pointer;"> <img src="<%= VirtualPathUtility.ToAbsolute("~/img/chic/Profile_disabled.png")%>" /> </td> </tr> <tr> <td id="Td1"> <b>Indications Calculator | </b> </td> <td id="lblIc"> <b>Indications Calculator - Beta | </b> </td> <td id="lblPricing"> <b>Managing Pricing Triggers | </b> </td> <td id="lblSheets"> <b>Creating Pricing Sheets | </b> </td> <td id="lblPort"> <b>Portfolio Analysis | </b> </td> <td id="lblAdmin"> <b>Administration</b> </td> </tr> </tr> </table> </div> </div> </td> </table> <div id="pageMessage"></div> <script> $(document).ready(function () { $('#btnIc').live('click', function () { window.location.href = "<%=Url.Action("Indications") %>"; }); $('#btnIcOld').live('click', function () { window.location.href = 'https://extranetint/swap'; }); $('#btnPricing').live('click', function () { //window.location.href = "<%=Url.Action("Triggers") %>"; }); $('#btnSheets').live('click', function () { //window.location.href = "<%=Url.Action("Sheets") %>"; }); $('#btnPort').live('click', function () { //window.location.href = "<%=Url.Action("Analysis") %>"; }); $('#btnAdmin').live('click', function () { //window.location.href = "<%=Url.Action("Admin") %>"; }); }); </script> </asp:Content> How can I, with JQuery (or really anything), achieve a mouse-over effect on my images where they will grow a little bit as you hover over them? I tried using JQuery animate but for some reason I couldn't get it to work. Thanks!

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  • Can I detect unused extra parameters passed to javascript methods?

    - by Pablojim
    In Javascript I can call any method with more than the necessary amount of parameters and the extra parameters are silently ignored. e.g. letters = ['a','b','c'] //correct letters.indexOf('a') //This also works without error or warning letters.indexOf('a', "blah", "ignore me", 38) Are there ways to detect cases where this occurs? My motivation is that in my experience cases where this occurs are usually bugs. Identification of these by code analysis or at runtime would help track these errors down. These cases are especially prevalent where people are expecting alterations to base types which may not have occurred. Logging a warning where this happens e.g. Date.parse('02--12--2012', 'dd--MM--YYYY') Notes: To be clear I would like a solution that doesn't involve me sprinkling checks all over my code and other peoples' code.

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  • Selenium RC slower on Windows 7 than on XP?

    - by phenevo
    I've got two systems, one with Windows XP and another with 7, both running Firefox 3.6, the same version of Selenium RC and the newest nunit. When I run tests on 7, it is executed extremely slowly (I mean walking by textbox and setting its values), but when I execute this script on Windows XP it is extremely fast. Do you have the same experience? Do you know what the problem might be?

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