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  • How to understand Linux kernel source code for a beginner?

    - by Amit Chavan
    Hi, I am a student interested in working on Memory Management, particularly the page replacement component of the linux kernel. What are the different guides that can help me to begin understanding the kernel source? I have tried to read the book Understanding the Linux Virutal Memory Manager by Mel Gorman and Understanding the Linux Kernel by Cesati and Bovet, but they do not explain the flow of control through the code. They only end up explaining various data structures used and the work various functions perform. This makes the code more confusing. My project deals with tweaking the page replacement algorithm in a mainstream kernel and analyse its performance for a set of workloads. Is there a flavor of the linux kernel that would be easier to understand(if not the linux-2.6.xx kernel)?

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  • What threading pratice is good 90% of the time?

    - by acidzombie24
    Since my SO thread was closed i guess i can ask it here. What practice or practices are good 90% of the time when working with threading with multiple cores? Personally all i have done was share immutable classes and pass (copy) data to a queue to the destine thread. Note: This is for research and when i say 90% of the time i dont mean it is allowed to fail 10% of the time (thats ridiculous!) i mean 90% it is a good solution while the other 10% it is not so desirable due to implementation or efficiently reasons (or plainly another technique fits the problem domain a lot better).

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  • Is this the right strategy to convert an in-level order binary tree to a doubly linked list?

    - by Ankit Soni
    So I recently came across this question - Make a function that converts a in-level-order binary tree into a doubly linked list. Apparently, it's a common interview question. This is the strategy I had - Simply do a pre-order traversal of the tree, and instead of returning a node, return a list of nodes, in the order in which you traverse them. i.e return a list, and append the current node to the list at each point. For the base case, return the node itself when you are at a leaf. so you would say left = recursive_function(node.left) right = recursive_function(node.right) return(left.append(node.data)).append(right);` Is this the right approach?

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  • Authentication for users on a Single Page App?

    - by John H
    I have developed a single page app prototype that is using Backbone on the front end and going to consume from a thin RESTful API on the server for it's data. Coming from heavy server side application development (php and python), I have really enjoyed the new different design approach with a thick client side MVC but am confused on how best to restrict the app to authenticated users who log in. I prefer to have the app itself behind a login and would also like to implement other types of logins eventually (openid, fb connect, etc) in addition to the site's native login. I am unclear how this is done and have been searching - but unsuccessful in finding information that made it clear to me. In the big picture, what is the current best practice for registering users and requiring them to login to use your single page app? Once a user is logged in, how are the api requests authenticated? Can I store a session but how do I detect for this session in the API calls? Any answers to this would be much appreciated!

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  • I dont know how to run e2fsck or fsck and what are their differences

    - by Salvador
    My Kern.log file advise me to run e2fsck. Aug 30 14:10:11 ubuntu kernel: [ 122.378292] EXT4-fs (sda11): warning: maximal mount count reached, running e2fsck is recommended Aug 30 14:10:11 ubuntu kernel: [ 122.387488] EXT4-fs (sda11): mounted filesystem with ordered data mode. Opts: (null) /dev/sda11 is not mounted within my current OS (Ubuntu 10.04) I have known that e2fsck is a dangerous command when running against the root partition which is at the same hard disk as sda11. I would trust in this solution better than others: Can I run fsck or e2fsck when Linux file system is mounted?

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  • Global menu not showing in Ubuntu 12.10 with Unity

    - by William
    I am on Ubuntu 12.10 with Unity shell. I am not quite sure what happened, but today I noticed that the menubar (containing 'File, Edit, etc...') is not appearing on the panel as it used to (i.e. the global application menu), but on the application window under the title bar. The only application that still uses global menu is Chromium. Any ideas what settings may have changed? Also, when I right click on the desktop and select "Change Desktop Background", System Settings opens, instead of the "Appearance" settings. Apparently, here is a related question, with no answer: Global menu and HUD suddenly broken EDIT: I noticed this behavior on three of my computers after an update (I do not remember exactly which packages were updated). Now when I try to run apt-get upgrade, I get: The following packages have been kept back: gnome-control-center gnome-control-center-data I guess something is going on with updates. Any info would be appreciated.

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  • Installed Ubuntu In a low Specs PC and it is too slow, even with LXDE

    - by Herudae
    I'm new with Linux and started with Ubuntu 11.10, I installed it in my PC (Core2Duo 2Ghz, 512Mb Ram DDR2, integrated video in Motherboard), I know the requirements for Unity are 1Gb Ram so I decided to download a Desktop environment more lightweight, so I Installed LXDE, it loads very fast, compared to the 3.5 min from login screen to open desktop in Unity, but it freezes every time I open a single program, I can't even navigate in Internet, it freezes, sometimes for a pair of minutes and the graph at bottom right is all green as if iyt were using 100% CPU, it happens with every program. As additional data it takes 3+ min to get from boot system selection screen to Login screen and 3.5 Min more to get into Ubuntu with Unity, with LXDE it turns to 30 secs aproximately. Is Ubuntu + LXDE Desktop Environment Package = Lubuntu? or should I download Lubuntu directly instead? I installed some other desktop environments, as Gnome but it doesn't log in, the screen just turns grey. Should I get an older Ubuntu version? I'm thinking about uninstalling Ubuntu but I'll try to deplete the options, thanks for your support.

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  • Consuming JSON stream into AWS Database on the cheap

    - by wjl
    I'm working on a project that needs to consume a JSON stream (approximately 1MB / minute), and parse and insert objects into a database. Amazon's DynamoDB or SimpleDB seem like attractive options for this. Is there a web service that can run a very simple script to eat the data and put it in a database? I could use a worker on Heroku or Elastic Beanstalk, or even pure EC2, but I'd like to find a service that's much cheaper, due to the very low amount of bandwidth and CPU required. (Sorry for the crappy tags. I'm not even sure where to categorize this question.)

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  • Can You Name the Top 10 Technology Trends?

    - by kellsey.ruppel
    Can You Name the Trends? No need to do the research. Come to this Webcast and find out. Join the conversation as Andy Mulholland, Global CTO, Capgemini, discusses the 10 game-changing technology trends that will enable business innovation. As you might expect, three of the trends discussed will be: Mobility: from nice-to-have to a cornerstone of user engagement Big data: how to acquire, organize, and analyze it Cloud computing: how to build applications, automate processes, collaborate, and secure the enterprise But you’ll have to attend the Webcast to learn about the other seven trends. Register now. And profit from the experience. REGISTER NOW Thurs., July 19, 201210 a.m. PT / 1 p.m. ET Presented by: Andy MulhollandGlobal CTO, Capgemini Christian FinnSenior Director, Oracle WebCenter Product Management, Oracle Copyright © 2012, Oracle. All rights reserved. Contact Us | Legal Notices and Terms of Use | Privacy Statement

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  • Ubuntu touch flashing failed/taking to long. Black screen! Redeploy help!

    - by Marius Rye
    So i'm brand new to the whole unlock, root and flashing thing. I just tried flashing Ubuntu touch on my Galaxy Nexus (international GSM/HSPA+) and everything seamed fine until the very end when i got this ERROR message. ERROR:phablet-flash:Installation is taking too long or an error occured along the way. I didn't know what to do so i disconnected my device (which was in Ubuntu recovery) and tried rebooting it from there, it worked "sort of". i got the Google logo with the unlocked icon then it continued to a black screen. In the installation guide on http://www.ubuntu.com/phone/install said i should: "try wiping the /data partition on your device and redeploy". the problem is that i don't know how to do this and i'm basically sitting here with a useless phone right now. I would be extremely grateful for some proffeexpert help.

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  • Self-Service Testing Cloud Enables Improved Efficiency and Productivity for Development and Quality Assurance Organizations

    - by Sandra Cheevers
    With organizations spending as much as 50 percent of their QA time with non-test related activities like setting up hardware and deploying applications and test tools, the cloud will bring obvious benefits. Oracle announced today self-service testing capabilities to enable you to deploy private or public testing clouds. These capabilities help software development and QA organizations deliver higher quality applications, while enhancing testing efficiency and reducing duration of testing projects. This kind of cloud based self-service testing provides better efficiency and agility. The Testing-as-a-Service solution offers test lab management, automatic deployment of complex multi-tier applications, rich application performance monitoring, test data management and chargeback, all in a unified workflow. For more details, read the press release Oracle Announces Oracle Enterprise Manager 12c Testing-as-a-Service Solution here.

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  • How to Get Myself Up to Speed in Building a Java Web App

    - by Damian Wells
    I'm a new developer at a fairly large company and I'm working on a Java Web Application with a senior developer there. The Web App is built on top of an IBM stack (RAD, DB2, WebSphere) and basically uses JSPs and Servlets. The Web App is an internal tool to be used by employees to manage data coming from Excel files. So, there are lots of database interaction going around like SQL commands. My question is: I don't know much about JavaEE as a whole and only know a little about JSPs and Servlets and I would like to get myself up to speed so I can understand and contribute to the Web App as fast as I could. What resources (tutorials, links, etc) should I be looking at? Am I supposed to get a book about JavaEE or something that focuses just on JSPs and Servlets?

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  • Upgrading Beta to full version work without bugs? [closed]

    - by Nicky Bailuc
    Possible Duplicate: I installed an alpha or beta, am I up to date with the final release if I keep upgrading? When the Beta version of 13.4 comes out, I would like to install it and therefore put all my programs, files, and data on it. On the 18th when the original version of 13.4 comes out, will I be able to upgrade the beta into the original without any issues and successfully run it without bugs. I'm asking this because when i upgraded 12.4 to 12.10 it had a lot of glitches to it. Will the 13.4 run the same after upgrading as if I was to install the it directly as it is?

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  • Windows7 Gone after Ubuntu dual boot install

    - by Adi
    I had a very hard time to dual boot install Ubuntu 12.04 Apparently, Ubuntu has restriction of 4 partitions and I already had 4, so it just couldn't recognise my partitions. This was something I realised too late, but finally got to install Ubuntu. Now, even though Windows 7 option is listed when I try to boot my laptop, it doesn't really let me boot and just loops back to begin. I tried windows repair DVD also, didn't work. I was fine with complete fresh install of windows too, but Windows CD didn't detect my Hard Disk Drive or any partitions (even though the original C drive with Windows is still an NTFS partition, according to gParted, and I can access the data from same using Ubuntu log in). My Ubuntu works fine, but I need windows log in also. Any suggestions anyone?

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  • handling a GET error properly

    - by Andrew Heath
    I have a website that takes two primary get strings: ?type=GAME&id=SomeGameID ?type=SCENARIO&id=SomeScenarioID for reasons unknown, I have recently begun receiving requests for erroneous get strings from both Yandex and Baidu. They are always in the form of: ?type=GAME&id=SomeScenarioID None of my users are triggering these errors, so I am (sort of) confident that this is not due to an HTML template error somewhere on my part. There is also no HTTP_REFER showing up in the $_SERVER array, so I'm guessing these are direct requests from bad dbase data on their part. I see two options for dealing with these bad requests, and would like to know which is recommended... or if there are other, better options I have not thought of: simply 404 the request, since it is incorrect redirect the request to ?type=SCENARIO&id=SomeScenarioID because the scenario IDs are always valid, the breakage is due to asking for the wrong type.

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  • Have you downloaded the Oracle SOA Governance Resource Kit yet? By Yogesh Sontakke

    - by JuergenKress
    Effective Service-Oriented Architecture (SOA) Governance is an essential element in any enterprise transformation strategy. Oracle's SOA Governance solution eases the transition of an organization to SOA by providing a means to reduce risk, maintain business alignment, and show the business value of SOA investments. Whether just embarking on an SOA initiative, or expanding a project or pilot for a broader deployment, this SOA Governance resource kit will guide you along the path to a measurable SOA success. The SOA Governance resource kit includes: White papers, data sheets, analyst reports and customer success stories Webcasts, podcasts and other interactive resources Software downloads from Oracle Technology Network (OTN) Additional information from Oracle.com and OTN Get it here now!” SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Mix Forum Technorati Tags: SOA Governance,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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  • Used DBAN to wipe Lenovo u410 then installed Ubuntu. Need to install windows 8, but I get an error.

    - by David
    When I try to boot from my windows 8 USB (tested on a separate PC), I get this error text "The boot configuration data for your pc is missing or contains errors." I want to install windows again so I can fix a battery issue I'm having. Lenovo's power management app has an option to keep the battery at 60% if the laptop stays plugged in most of the time. I enabled this, then formatted without changing it back. I think there might be a raid setup that I may need to remove or something. I don't mind removing Ubuntu and starting fresh. I would just love some help with all this, I'm a noob when it comes to Linux.

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  • T-SQL User-Defined Functions: the good, the bad, and the ugly (part 1)

    - by Hugo Kornelis
    So you thought that encapsulating code in user-defined functions for easy reuse is a good idea? Think again! SQL Server supports three types of user-defined functions. Only one of them qualifies as good. The other two – well, the title says it all, doesn’t it? The bad: scalar functions A scalar user-defined function (UDF) is very much like a stored procedure, except that it always returns a single value of a predefined data type – and because of that property, it isn’t invoked with an EXECUTE statement,...(read more)

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  • Why did Ubuntu and Windows start hanging mysteriously after I took a vacation?

    - by Ashrey Goel
    I installed Ubuntu alongside my Windows 7, after partitioning my HDD using Easeus partitioning manager. It was working perfectly, no problems, no data lost or corruption. Then I went away for 2 days and in my absence I don't know what happened in that period, now both Windows 7 and Ubuntu keep hanging continuously, like when you paint and change a brush it'll hang, I mean on very simple commands and I know my computer does not hang on such petty things. I use it for developing music and the specification are: Model: DELL-XPS Processor: Intel i5, 2.53 GHz RAM/Memory: 4GB Hard disk size: 500GB HDD Windows 7 partition: 417 GB Ubuntu Partition: 50 GB Please Help.

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  • Multi-platform Map Application

    - by Mahdi
    I'm working on a web project (PHP, jQuery) which currently using Google Maps powering up the map functionality of the application, however we need to make it multi-platform like you can go to the dashboard and choose one from 5-10 map providers (which Goolge Maps is just one of them) to underlying your map functionality. So, as the application is supposed to show the data on map, almost in every single place we have to deal with the API provided by that specific map provider. Currently we are thinking about revising our modular structure and/or making something like an adapter for each provider to deal with their native syntax but via our standard methods. I wish to have your ideas and your experiences, specially if you ever made an interface for dealing via 2-3 different map providers. That would helps much and I really appreciate that. If you need any further information, just ask me to update the question. Update: As Vicky Chijwani suggested Mapstraction, now I'm also wondering which one is more better (pros & cons), having an adapter implemented on Javascript or PHP?

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  • How to draw a global day night curve

    - by Lumis
    I see many applications which have world-clock map, and I would like to make my own to enhance some of my mobile apps. I wonder if anybody has any knowledge where to start, how to draw a curved shadow representing the dawn and the sunset on the globe. See the example: http://aa.usno.navy.mil/imagery/earth/map?year=2012&month=6&day=19&hour=14&minute=47 I think that this curve goes up and down and creates an artic day/night etc Perhaps there is some acceptable approximation formula without a need to load data for each our and each global parallel and meridian...

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  • In Social Relationship Management, the Spirit is Willing, but Execution is Weak

    - by Mike Stiles
    In our final talk in this series with Aberdeen’s Trip Kucera, we wanted to find out if enterprise organizations are actually doing anything about what they’re learning around the importance of communicating via social and using social listening for a deeper understanding of customers and prospects. We found out that if your brand is lagging behind, you’re not alone. Spotlight: How was Aberdeen able to find out if companies are putting their money where their mouth is when it comes to implementing social across the enterprise? Trip: One way to think about the relative challenges a business has in a given area is to look at the gap between “say” and “do.” The first of those words reveals the brand’s priorities, while the second reveals their ability to execute on those priorities. In Aberdeen’s research, we capture this by asking firms to rank the value of a set of activities from one on the low end to five on the high end. We then ask them to rank their ability to execute those same activities, again on a one to five, not effective to highly effective scale. Spotlight: And once you get their self-assessments, what is it you’re looking for? Trip: There are two things we’re looking for in this analysis. The first is we want to be able to identify the widest gaps between perception of value and execution. This suggests impediments to adoption or simply a high level of challenge, be it technical or otherwise. It may also suggest areas where we can expect future investment and innovation. Spotlight: So the biggest potential pain points surface, places where they know something is critical but also know they aren’t doing much about it. What’s the second thing you look for? Trip: The second thing we want to do is look at specific areas in which high-performing companies, the Leaders, are out-executing the Followers. This points to the business impact of these activities since Leaders are defined by a set of business performance metrics. Put another way, we’re correlating adoption of specific business competencies with performance, looking for what high-performers do differently. Spotlight: Ah ha, that tells us what steps the winners are taking that are making them winners. So what did you find out? Trip: Generally speaking, we see something of a glass curtain when it comes to the social relationship management execution gap. There isn’t a single social media activity in which more than 50% of respondents indicated effectiveness, which would be a 4 or 5 on that 1-5 scale. This despite the fact that 70% of firms indicate that generating positive social media mentions is valuable or very valuable, a 4 or 5 on our 1-5 scale. Spotlight: Well at least they get points for being honest. The verdict they’re giving themselves is that they just aren’t cutting it in these highly critical social development areas. Trip: And the widest gap is around directly engaging with customers and/or prospects on social networks, which 69% of firms rated as valuable but only 34% of companies say they are executing well. Perhaps even more interesting is that these two are interdependent since you’re most likely to generate goodwill on social through happy, engaged customers. This data also suggests that social is largely being used as a broadcast channel rather than for one-to-one engagement. As we’ve discussed previously, social is an inherently personal media. Spotlight: And if they’re still using it as a broadcast channel, that shows they still fail to understand the root of social and see it as just another outlet for their ads and push-messaging. That’s depressing. Trip: A second way to evaluate this data is by using Aberdeen’s performance benchmarking. The story is both a bit different, but consistent in its own way. The first thing we notice is that Leaders are more effective in their execution of several key social relationship management capabilities, namely generating positive mentions and engaging with “influencers” and customers. Based on the fact that Aberdeen uses a broad set of performance metrics to rank the respondents as either “Leaders” (top 35% in weighted performance) or “Followers” (bottom 65% in weighted performance), from website conversion to annual revenue growth, we can then correlated high social effectiveness with company performance. We can also connect the specific social capabilities used by Leaders with effectiveness. We spoke about a few of those key capabilities last time and also discuss them in a new report: Social Powers Activate: Engineering Social Engagement to Win the Hidden Sales Cycle. Spotlight: What all that tells me is there are rewards for making the effort and getting it right. That’s how you become a Leader. Trip: But there’s another part of the story, which is that overall effectiveness, even among Leaders, is muted. There’s just one activity in which more than a majority of Leaders cite high effectiveness, effectiveness being the generation of positive buzz. While 80% of Leaders indicate “directly engaging with customers” through social media channels is valuable, the highest rated activity among Leaders, only 42% say they’re effective. This gap even among Leaders shows the challenges still involved in effective social relationship management. @mikestilesPhoto: stock.xchng

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  • google analytics reverse transaction not working with sales performance

    - by prasad maganti
    We have google analytics account and trying to do reverse transaction. We have created a transaction on one date and reverse transaction on some other date. After transaction if we do reverse transaction it disappears from transactions list. Is it the expected behavior or abnormal behavior? But, if we check the same order data in sales performance, the reverse transaction does not reflects on when we created the transaction, it reflecting on when we made reverse transaction date. It should not be do like this. The reverse transaction should affect the same date on when we made transaction date.

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  • How do I get an HP 1018 laser printer to work on 12.04?

    - by MInner
    edit : already printed on windows-machine Ubuntu 12.04, LJ 1018. I've tried making foo2zjs from sourse. I've downloaded firmware and placed it where necessarily manually from here I've also tried this - same as manual dowload but with some patches like stoping cups, etc.. I've fixed usbfs: process 11200 (usb) did not claim interface 0 before use problems using sudo rmmod usblp as described here. And now I have Aug 10 11:51:59 pav /usr/sbin/hplj1018: foo2zjs: usb://HP/LaserJet%201018?serial=KP07RLV... download failed. Aug 10 11:51:59 pav /usr/sbin/hplj1018: foo2zjs: loading HP LaserJet 1018 firmware /lib/firmware/hp/sihp1018.dl to CUPS USB device ... error. Before that prinet was stucking on "Sending data to printer". Now it's code is "Not connected". Unless ben@pav:~$ lsusb ... Bus 001 Device 015: ID 03f0:4117 Hewlett-Packard LaserJet 1018 Thank you.

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  • fix a broken ubuntu installation from pendrive

    - by interstar
    Something went wrong in the upgrade of my Ubuntu 13.04 to 13.10 The upgrade basically crashed halfway through. On booting I was thrown into a maintainence screen. I found some online instructions for fixing with the package manager ... Which seemed to do a lot of setting up. But then crashed saying package is in a bad inconsistent state. Now I'm in a position where Ubuntu starts again, but goes into a low-res screen and there's no WiFi. I have no Ethernet cable connection but I did download the 13.10 iso on another machine and put it on a pen drive. So I'd like to know there's a way of asking the machine from inside Ubuntu to redo its upgrade from the data on the pendrive rather than WiFi. Is this possible? Cheers Phil

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