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• I suspect that my HDD is causing hardlocks, as all other components have been replaced. How can I check this theory and solve the potential cause?

  - by user867814

  I have had this problem over quite a while now, thorough multiple Linux kernel versions and distributions, as well as replacement of all components, aside from my main HDD - RAM, GPU(twice), mother board, CPU, power supply. What happens is, at one point during the operation of the PC, it will hardlock - everything stops working, external HDD is not shut down correctly and continues to spin until I plug it out and in, there are no system/kernel logs of any kind, and no otherwise nothing that would suggest a cause. Another reason for my suspicion is that the failures happen almost exclusively during HDD read/write activity - shutdown(happens nearly 1/3 of the time so far, it's only been few days though), launching programs, and once during operation of apt. I hope the post is descriptive enough, if you need any additional info, ask(and tell me how to prepare/obtain it), and I will provide. If I'm wrong, point me in the right direction. Thanks in advance.

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• How to copy the value from a cell to another (using a formula), but not formula from the source cell

  - by RODY ROY

  I'm making use of NOW() function at many places in my spreadsheet, which is basically a checklist document. So my requirement is that for each step, it should record the datetime at which that step was completed. But whenever the Now() is being used... all the previously updated cells withe datetime are also getting updated again. Hence at the end of the day, am not able to get the detailed time at which each of those steps are completed. This is how I've created as of now: Used a Checkbox for each step. Once the step is complete, on clicking the Checkbox, it will update the cell A1 as "Completed". In the cell B1, I've put the following function which will check for the value in A1. If it is "Completed", then it will update the value of B1 with the current datetime using Now() =IF(A1="Completed";NOW();"") Please let me know a solution for this. Also if there any other alternative.

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• Screen refresh/display problem in Xubuntu 14.04

  - by user286328

  I have just installed Xubuntu 14.04 as a dual boot on a desk top (Pentium R 4 CPU, 2.66 GHZ, 2G RAM) running XP home edition. In some situations when in Xubuntu I am having what seem to be screen refresh problems. When I open File Manager or Settings Manager the text names of various apps display but most of the icons do not. Moving the mouse over an app name generally causes the icon to appear, but it often vanishes once the mouse pointer is moved. This issue occurs irrespective of the view setting. Icons appear fine in the menu that comes up when I right click in the desktop, and in the menu that comes up when I click the mouse icon at top left. What I suspect is a related issue. In Abiword text sometimes fades, disappears or does not display immediately when I type, or text of the whole document fades. It then comes back or darkens if I left click a few times on the text. If I scroll through a document the text often fades and may remain faded until I left click a few times.

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• Are there web search engines with exact match or regex capabilities (for related terms)?

  - by naxa

  Every once in a while I come upon a situation when google's way of searching results in too broad results even if I enclose my search terms in quotation marks. For example now I've tried to find pages that contain both "py.path" and "path.py" without much success. I'm currently aware of engines|sites like Google Code Search for searching actual code and (apparently) Stackoverflow for searching QAs, symbolhound that lets me find symbols, and also wikipedia is often a good place to find lists of symbols. But none of these seems to perform very good in matching exactly on search term pairs (or tuples) and use a broad-enough segment of the web. Is there a website that is good with exactly finding search term pairs? (Why not?)

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• When using MVVM, should you create new viewmodels, or swap out the models?

  - by ConditionRacer

  Say I have a viewmodel like this: public class EmployeeViewModel { private EmployeeModel _model; public Color BackgroundColor { get; set; } public Name { get { return _model.Name; } set { _model.Name = value; NotifyPropertyChanged(Name); } } } So this viewmodel binds to a view that displays an employee. The thing to think about is, does this viewmodel represent an employee, or a "displayable" employee. The viewmodel contains some things that are view specific, for instance the background color. There can be many employees, but only one employee view. With this in mind, when changing the displayed employee, does it make sense to create a new EmployeeViewModel and rebind to the view, or simply swap out the EmployeeModel. Is the distinction even important, or is it a matter of style? I've always leaned toward creating new viewmodels, but I am working on a project where the viewmodels are created once and the models are swapped out. I'm not sure how I feel about this, though it seems to work fine.

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• Sync Linux to Windows 2003/2008 Natively

  - by user26753

  Without using any external packages for Windows, can Linux synchronise it's clock to a Windows 03/08 Server natively? I've tried it using various NTP packages for Windows but would like to use just Windows software for this. EDIT: I've tried the below however it doesn't work. I've put TimeSource in /etc/hosts, stated server TimeSource in /etc/ntp.conf however when I do a service ntpd start it doesn't sync (it's 3 minutes out at the minute). I then stopped the NTPD and did a ntpdate TimeSource, thinking it would sync and then I'd start the NTPD once it's got the time, and it says: no server suitable for synchronization found. Though I can ping it. Any thoughts?

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• a safer no password sudo?

  - by Stacia

  Ok, here's my problem - Please don't yell at me for being insecure! :) This is on my host machine. I'm the only one using it so it's fairly safe, but I have a very complex password that is hard to type over and over. I use the console for moving files around and executing arbitrary commands a LOT, and I switch terminals, so sudo remembering for the console isn't enough (AND I still have to type in my terrible password at least once!) In the past I have used the NOPASSWD trick in sudoers but I've decided to be more secure. Is there any sort of compromise besides allowing no password access to certain apps? (which can still be insecure) Something that will stop malware and remote logins from sudo rm -rf /-ing me, but in my terminals I can type happily away? Can I have this per terminal, perhaps, so just random commands won't make it through? I've tried running the terminal emulations as sudo, but that puts me as root.

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• minimum required bandwidth for remote database server

  - by user66734

  I want to build a small warehousing application for my company. We have a central warehouse which distributes to 8 sales points across the country. They insist on an in-house solution. I am thinking to setup a central mySQL db Linux server and have the branches connect to it to store sales. Queries to the db from the branches will be minimum, maybe 10 per hour. However I need all the branches to be able to store each sale data ( product ID, customer ID ) in the central db at peak time at most once every five minutes. My question is can I get away with simple 24mbps/768kbps DSL lines? If not what is the bandwith requirement? Can I rely on a load balancing router to combine additional lines if needed? Can you propose some server hardware specs?

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• How to move your focus out of the text?

  - by Aerovistae

  I've got a PDF open in Acrobat. I like to scroll the "standard" way, where I can press the arrow key up to go up by a line or two, and the arrow key down for the opposite. But sometimes I accidentally click the text, and then suddenly the arrow keys control moving the cursor around inside the page instead, so I have to hold it down and move the cursor all the way to the bottom of the page before it'll start scrolling the page down, and then all the way back up if I want to go up again. I can't find any way to move focus out of the text once I've clicked it. I actually have to close Acrobat and reopen the PDF. It's kind of amazing. Solutions?

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• How does process of updating code with Continous Integration work?

  - by BleakCabalist

  I want to draw a model of process of updating the source code with the use of Continous Integration. The main issue is I don't really understand how it works when there are several programmers working on various aspects of the code at the same time. I can't visualize it in my mind. Here's what I know but I might be wrong: New code is sent to repository. Continous Integration server asks Version Control System if there is a new code in repository. If there is than CIS executes tests on the code. If tests show there are problems than CIS orders VCS to revert back to working wersion of the code and communicates it to programmer. If tests are passed positively it compiles the repository code and makes new build of a game? New build is made not after ever single change, but at the end of the day I believe? Are my assumptions above correct? If yes, does it also work when there are several programmers updating repository at once? Is this enough to draw a model of the process in your opinions or did I miss something? Also, what software would I need for above process? Can you guys give examples for CIS software and VCS software and whatever else I need? Does CIS software perform code tests or do I need another tool for that and integrate it with CIS? Is there a repository software?

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• Network(ing) to the Limit

  - by Oracle OpenWorld Blog Team

   By Karen Shamban While Oracle OpenWorld attendees are networking, there's an Oracle Global IT team that builds and maintains the massive networks that help run the show. The objective? To keep things running as seamlessly and smoothly as possible, constantly evaluate priorities, mitigate risk, and be ready for whatever might happen -- because things do happen when there are 50,000 plus attendees, tens of thousands of devices, unexpected requirements, and a constant flow of up-to-the-minute information. Here's just some of what it takes to keep the conference going, network style: 100 Oracle network, voice, and desktop engineers; security, risk management, and other IT experts, who come in from 17 countries  1000+ network switches 300+ miles of copper and fiber 485 wireless access points 2,500 wired laptops 300 VoIP phones And just where are all these networks and devices deployed? This is what the team had to build and manage: Moscone North, South, and West, including: The keynote hall Oracle DEMOgrounds in the Exhibition Halls Hundreds of session rooms Connection Centers, Social Avenue, Lounges Registration The Howard Street Tent and Taylor Street Cafe tented venues Oracle Square (Union Square) Yerba Buena Gardens Masonic Auditorium Sessions and demos at 8 hotel venues That's a whole lot of networking going on. And here's the kicker: the team has only 4 days to bring get it all up and running across these many venues, and exactly 12 hours to take it all down once the show ends. The Global IT team puts in the equivalent of 152 24-hour days for set-up, 227 24-hour days of support during the conferences, and then tears it all down in about 20 24-hour days. And in case you were wondering, the planning for next year's Oracle OpenWorld starts ... next week. No rest for the weary.  Now THAT's networking!  So hats off to the Global IT team -- the job ain't easy, but somebody's got to do it, and they do it remarkably well.

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• Why is execution of batch files different between drag & drop and from command line?

  - by Dharma Leonardi

  Ok, so I've been trying to figure this out for hours with no progress. I have created a batch file to get details of a VHD. Everything runs fine and produces the expected results when run from the command line in a command prompt. However, when I use drag and drop from file explorer (dragging a vhd file and dropping onto the batch file) the batch file runs without errors but the output (VHD.INFO) is empty. I'm stumped. Edited to only include the behaviour: @echo off cls setlocal enabledelayedexpansion set "_PATH.THIS=%~dp0" echo HELP | diskpart > %_PATH.THIS%OUTPUT.TMP TYPE %_PATH.THIS%OUTPUT.TMP PAUSE To demonstrate the different behaviour, please run the batch file from the command line once (works) and also run the batch file by double clicking in file explorer (failure in all piping commands).

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• Vmware peaks NFS load every 30 seconds

  - by gtirloni

  We were troubleshooting a performance problem on one of our storage servers and after investigating almost everything in sight we saw that every 30 seconds, Vmware would go from 10k IOPS (NFS) to 30k, 50k, 100k or whatever the server would handle. Most of it were reads. What could cause this raise in NFS operations per second every 30 seconds? The virtual machines are managed by external customers and there isn't much in common between them. While breaking utilization down by filename, we discovered 5-10 virtual machines that contributed more to those peaks but it still doesn't explain why every 30 seconds. There are no other peaks outside that 30 sec period (ie. it stays in an almost constant average). Is there an NFS tweak in Vmware to change that 30 second period? If that's really necessary, we would like to introduce some variation so all that workload isn't dropped all at once. It's causing NFS timeout on the ESX 3.5/4.0 hosts when the storage gets overloaded.

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• Send chrome tab from w7 laptop to w7 HTPC? (Like with iPad to AppleTV)

  - by Justin

  For the last couple days I've been trying to figure out how to get open tabs syncing between chrome installs on different computers to no avail. (if it's supposed to work the way I think it should, that is.) I have a laptop that I do all my web browsing on. Once in a while I'll come across some video that's worthy of the big-screen and the surround sound and want to open that tab (or media) on the HTPC. It'd be nice if I could just 'Right click Send to HTPC' and it opens up there with no further hassle. But even opening chrome on the HTPC and finding all my current tabs waiting would be fine. Alas, open tabs syncing doesn't seem to actually open tabs on other devices for me. Has anyone come up with a way to accomplish anything similar? Thanks all!

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• How to deploy Windows-8 Enterprise Apps to other users?

  - by TToni

  Windows-8 (Metro) Apps can be installed using "sideloading", bypassing the Windows store in enterprise environments. In principle this is easy: Once you enabled sideloading (which is automatically done when a Win8-machine joins a domain), you can install a signed appx-Package through PowerShell with the "Add-AppxPackage" command. But there is a catch: The App is only installed for the user who executes the command and there is no "-Credentials" parameter! I can probably solve that problem in my specific scenario, where I deploy a self-developed app through TFS build to a virtual machine with a fixed demo user (by using remote powershell in combination with "Add-Job", which does take a credential parameter and because I know the given username and the password). But that is not true in an enterprise environment, where I want to distribute my App to thousands of users. Cracking all their passwords seems a bit over the top, so what would be the "correct" way to do this? I can't find any useful information from Microsoft about this, but maybe one of you already ran into this problem and solved it?

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• Windows XP alt-tab: How to restrict options to certain applications, in certain order and exclude others?

  - by Rob

  In Windows XP Alt-tab keypress sequence to select applications, how can I ensure that certain applications always appear, in a certain order, with others always excluded? Background for asking is that most XP-based machines that I am working with on a shop floor present the list of shortcuts in a certain order and certain applications. There is one machine however, that displays an additional application. This is a hindrance to the users of the machines, as the nature of their work is routine and this variation disrupts the remembered sequence, "disrupts their flow". Thoughts? Being a good superuser, I research first before asking, and I found: Applications randomly alt-tab? (especially full screen games) Restore Alt-Tab behavior so that minimizing an app once again moves it to the end? (2. looks close to the control I need, but would need more finer, preciser control over what appears in the selection). Suggestions? (Thanks in advance.)

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• Utilising a Magento server cluster to drive hot reindexing

  - by WOBenji

  We've asked a similar question in the past, basically we have a very large Magento store with 500000 products which are currently reindexed once a day, during the night. We'd like to speed this process up significantly, we're at about 4-5 hours now. The solution was suggested for us to do something like this on a server cluster and replicate the database changes after they've been done on a machine that isn't being bothered with serving customers. But what is the mechanism for that? How do we replicate those changes across to the live site from the server cluster? Can someone point me in the right direction here?

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• How do I get openssh to save my ssh identity permanently?

  - by Alliswell

  How do I change it to save my identity permanently? During my login session after I have entered: $ ssh-add Then identity is saved and I can connect via ssh without getting the dreaded: Enter passphrase for key Once I logout and login back-in I get the following when running: $ ssh-add -L The agent has no identities. $ ssh <hostname> Enter passphrase for key '/home/user/.ssh/id_rsa': Stackoverflow has the following solution, yet I do not understand the reference to in the config file: IdentityFile ~/.ssh/id_rsa_buhlServer Specifically I do not understand what I would put on the identity file. Would I put the above word for word? Or just add my file: IdentityFile ~/.ssh/id_rsa StackOverflow solution

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• At what point does caching become necessary for a web application?

  - by Zaemz

  I'm considering the architecture for a web application. It's going to be a single page application that updates itself whenever the user selects different information on several forms that are available that are on the page. I was thinking that it shouldn't be good to rely on the user's browser to correctly interpret the information and update the view, so I'll send the user's choices to the server, and then get the data, send it back to the browser, and update the view. There's a table with 10,000 or so rows in a MySQL database that's going to be accessed pretty often, like once every 5-30 seconds for each user. I'm expecting 200-300 concurrent users at one time. I've read that a well designed relational database with simple queries are nothing for a RDBMS to handle, really, but I would still like to keep things quick for the client. Should this even be a concern for me at the moment? At what point would it be helpful to start using a separate caching service like Memcached or Redis, or would it even be necessary? I know that MySQL caches popular queries and the results, would this suffice?

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• Rotate camera with mouse? [closed]

  - by ezio160324

  Once again, using tutorial 10 at NeHe. I want the code if (keys[VK_RIGHT]) // Is The Right Arrow Being Pressed? { yrot -= 1.5f; // Rotate The Scene To The Left } if (keys[VK_LEFT]) // Is The Left Arrow Being Pressed? { yrot += 1.5f; // Rotate The Scene To The Right } and if (keys[VK_PRIOR]) { lookupdown -= 1.0f; } if (keys[VK_NEXT]) { lookupdown += 1.0f; } to be done with the mouse instead of left/right arrow and Page Up/ Page Down. I tried everything I could think of. Can anyone help? EDIT: I tried using WM_MOUSEMOVE message. I just could not figure it out. EDIT2: I am using pure OpenGL to do this. No window management system or other libs such as GLUT, GLFW, SDL, SFML etc. Just OpenGL. OpenGL and GLEW. EDIT: Issue has been solved.

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• Tricking Linux apps about current time with environment variables

  - by geek

  Sometimes it is possible to trick a Linux app by calling it like this: HOME=/tmp/foo myapp This would make myapp think /tmp/foo is the home directory, it won't try to get the user id, find its home directory via getpwent(). This is useful when myapp must be forced to dump some of its config files into a non-standard location different than ~. A similar trick can be done like this: LANG=foo LC_ALL=bar myapp This is useful when myapp needs to be called once with a different locale without having to make the change persistent by using the export bash built-in or even modify stuff in /etc/profile. Is it possible to pull the same trick with time and date? The goal is to make an app use another time than the system ones. The final goal - to make timestamps that appear in logs/commit messages not being tied to the system time.

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• Checking that tasks are executed

  - by homer5439

  I'm not sure how to explain this. Once one starts having dozens or hundres of servers, each running some sort of periodic jobs (mostly from cron), there is a problem of making sure (or as sure as possible) that these tasks are actually ran. I mean, I get an email if a job fails fails, and no mail if it succeeds, but also no mail if it doesn't run for whatever reason. Sure, I could change them and have them send a "successfully ran" email, only to be flooded by mails that most of the time I don't want to see. Basically, I want to be notified only if: a task ran and failed a task didn't run at the expected time. Is there a way to do this?

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• Vista Startup - Cannot Find the File Specified

  - by Redmastif

  Yesterday I restarted my laptop because my Wi-Fi catcher wasn't working correctly, and when the computer reached the login screen, instead of showing my user account it said "Cannot find the file specified". I rebooted and ran the Startup Repair and Memory Diagnostics but nothing showed up. I also took the battery out for a minute and tried again but still no luck. The weird thing is that I cannot even boot into safe mode, it still shows the same error. I don't remember downloading or opening anything suspicious recently, and I have 3 different cleaners/anti-malware programs as well that I usually run about once a week. I did go into the registry recently but I didn't modify or delete anything as I was only checking to see if I had a certain key in it. I have a Dell laptop running Vista Home Basic SP2. If I have to I can reinstall the OS with the CD or even take it to Best Buy but I'd rather try and fix it first. Thanks.

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• Multiple EyeFinity Display groups

  - by Shinrai

  Is it possible with an EyeFinity enabled card to make multiple display groups at once? I was playing with a FirePro 2460 and while a 4x1 or 2x2 display group works quite nicely, if I make a 2x1 display group and then select one of the other displays to try to make a second 2x1 display group, it disables the first one. Is there any way to circumvent this behavior and set up two separate spans on the same card? Additionally, can you set up distinct display groups if they're on different cards? I will have the opportunity to test several of these cards in one machine very shortly, but I'm curious if anyone has any experience. EDIT: I can confirm that you can make multiple spans on multiple cards (as long as they don't cross cards, obviously) (If the answers are different for FirePro/FireMV cards and Radeon cards, that is helpful and relevant knowledge - I doubt it, though.)

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• Minimizing use of paper

  - by Abody97

  I've recently faced this problem in a dynamic programming curriculum, and I honestly have no idea about how to determine the appropriate state. You're given N (1 <= N <= 70) paragraphs and M (1 <= M <= N) figures. Each paragraph i requires PL_i (1 <= PL_i <= 100) lines and references at most one figure. Each figure is referenced exactly once (i.e., no two paragraphs can reference the same figure, and for each figure there's a paragraph that references it.) Each figure requires PF_i (1 <= PF_i <= 100) lines. The task is to distribute those figures and paragraphs on paper in the order they're given, where one paper fits for L lines at most. No paragraph or figure is too large to fit on one paper. If a paragraph x placed on paper x_p references a figure y then y must be placed on either the paper x_p - 1 or x_p or x_p + 1. We have to find the minimum number of lines (and thus pages) to allocate in order to distribute all the figures and paragraphs. Any help would be extremely appreciated. Thanks in advance!

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