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• For virtual machines, when SMP is available on the host, should guest also have SMP setup?

  - by supercheetah

  I'm trying to find out the best "bang for my buck" so to speak in regards to virtual machines, and SMP. I have an Intel Core 2 Duo, which of course has two cores and the VT extensions, and I'm running Ubuntu Linux (host) on it with VirtualBox, which has Windows Vista (guest). Currently I've got the guest machine setup for two processors to give Windows a chance to manage its own parallelism, but I'm not certain that it's any faster. I've tried it with just one processor, but it's hard to tell if it's any better. Any thoughts? Should the guest have two processors setup?

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• Running a Check-Disk (Is it dangerous)

  - by vaccano

  I have a lap top that a friend of mine would like me to fix. It is giving a blue screen on boot up. When I looked up the error message it indicates that I should run a check disk. Is this dangerous? Should I try to off load stuff from the hard drive first? I ask because I had a hard drive of my own that when I ran check disk it wiped a bunch of "bad sectors" and I lost most of the info on it (but it had been going bad). Opinions?

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• Is that possible to route all mails sent to a mailbox to another server's mailbox

  - by Chau Chee Yang

  I have a Linux server that has local mail service. There are few user accounts on this server. User may send the mail to each other but that only restrict to LAN environment only. For example, I may # mail user1 to send mail to user1. User are not able to send mail to public. Some service like hylafax using this local mail service to send notification of fax status. I don't want to manage and maintain local mail service anymore. I have subscribed a package from ISP to host a public domain of my own. I wish to have my hylafax service to able to send the notification mails to public mail server, is that possible to do it? It is great if all mails that send to local mail server may forward to public mail server. That makes the local mail service serve mail forward only.

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• Watson Ties Against Human Jeopardy Opponents

  - by ETC

  In January we showed you a video of Waton in a practice round against Jeopardy champions Ken Jennings and Brad Rutter. Last night they squared off in a real round of Jeopardy with Watson in a tie with Rutter. Watson held his own against the two champions leveraging the 90 IBM Power 750 servers, 2,880 processors, and the 16TB of memory driving him to his full advantage. It was impressive to watch the round unfold and to see where Watson shined and where he faltered. Check out the video below to footage of Watson in training and then in action on Jeopardy. Pay special attention to the things that trip him up. Watson answers cut and dry questions with absolute lighting speed but stumbles when it comes to nuances in language–like finis vs. terminus in the train question that Jennings answered correctly. Watch Part 2 of the video above here. Latest Features How-To Geek ETC Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Here’s a Super Simple Trick to Defeating Fake Anti-Virus Malware How to Change the Default Application for Android Tasks Stop Believing TV’s Lies: The Real Truth About "Enhancing" Images The How-To Geek Valentine’s Day Gift Guide Inspire Geek Love with These Hilarious Geek Valentines MyPaint is an Open-Source Graphics App for Digital Painters Can the Birds and Pigs Really Be Friends in the End? [Angry Birds Video] Add the 2D Version of the New Unity Interface to Ubuntu 10.10 and 11.04 MightyMintyBoost Is a 3-in-1 Gadget Charger Watson Ties Against Human Jeopardy Opponents Peaceful Tropical Cavern Wallpaper

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• Caching API Proxy Server

  - by edc1591

  I need to have a server that caches API responses and then forwards them along to a desktop app. I don't really have much experience with this, so I have a few questions. First of all, what kind of server should I get? I already use Linode for my websites, so ideally I'd like to go with them. I expect to get anywhere from 30 million to 40 million requests to my proxy server each month. Will a 512 Linode be able to support that? Also, is there any software out there that does this already, or will I have to write my own? The API responses are roughly 10 KB each on average, so doing the math, that's a lot of data each month. Should I just add more transfer to whatever server I buy, or can I somehow compress the API responses before sending them off to the user? Thanks for any help.

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• Troubleshooting source of heavy resource-usage on a windows server 2008 running multiple sites

  - by batman_man

  Hi, I am running about 10 asp.net websites on a hosted virtual server. The server runs Server 2008 - each website is backed by its own database running on SQL server 2008 on the same box. Lately the box has seemed really slow. The only kind of discovery i could think of doing was looking in the task manager, where i can see w3wp and sqlserver.exe jumping to 40% cpu usage every 5-10 seconds. What are the steps i can take to determine which of my websites is taking these resources and or what database is getting hit the most? I have of course ssms installed on the machine as well. As you can tell, my sysadmin skills are very very limited - any help would be much appreciated.

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• Open Source Security packages for Rails

  - by Edwin

  I'm currently creating a complete web application using Rails 3 to familiarize myself with its inner workings and to gain a better appreciation of a working web application's moving parts. (Plus, since I'm still working on my degree, I hope that it will give me a better idea of what's BS in my education requirements and which weaknesses/skills I should focus on.) The example application I'm working on is an ecommerce site, and I've already configured the backend, routes, controllers, and so on. As part of the application, I'd like to integrate a second layer of security on top of the one Rails already provides for user authentication. However, I've been unable to find any on Google, with the exception of OAuth - which, from my understanding, is meant to secure API calls. While I could roll my own secure authentication system, I'm only in my second year of college and recognize that A) I know little about security, and B) there are developers that know much more about security that are working on open-source projects. What are some actively developed open-source security packages or frameworks that can be easily added to Rails? Pros and cons are not necessary, as I can do the research myself. P.S. I'm not sure whether I posted this in the right SE site; please migrate to SO or Security if it is more appropriate there.

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• What would be the total expenses of running an in-home web server?

  - by techaddict

  I have several hosting accounts with companies, and plan to keep them. However, I would like to try my hand at creating my own home web-server, both for fun and for the learning experience. I would like to know the expenses involved, including: electricity costs (greater than light bulb?) internet costs (will I have to upgrade my internet? Or is 3-5Mbps upload speed fine for a web server with medium amount of traffic? Would I have to get a separate internet connection?) other unknown expenses Consider that I will configure the web server myself, so that is not an expense. Also consider that I already have a computer (year-old Dell laptop, 15R) to use to be dedicated as the web server.

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• New META TAGS with positive effects for seo ranking in 2011 and beyond

  - by Sam

  Hi all, im trying to make an up to date chart of meta tags, for all of us, with their purposes, their use and their good (or bad) effects on search engines/being found. Also any body knows new/promising meta tags? I will add yours into my list so this chart is a result of live discussion and up to date. Also, it would be creative to invent your own useful meta, because we are the ones making the web, or aren't we? LEGEND P PURPOSE? What does this meta tag do in 2011, if anything N NECESSARY? Does every site really needs it or not? G GOOD wether it will have a good effect for your site to be found I INVENTED meta tag, who knows it will be accepted in a year! META "METANAME" = PURPOSE? - NECESSARY? - GOOD EFFECT? #### important meta "title" = P consice summary + teaser - N very - G extremely meta "description" = P description + teaser - N yes - G very meta "robots" = P if needed, to skip default dmoz/yahoodir listing - N no - G? #### new & promising! Thanks for input (John, ) meta "original-source" P url of whoever broke the news gets credits - N? - G? meta "syndication-source" P url for syndication of published news - N? - G? meta "canonical" P? - N? - G? #### seems obsolete meta "keywords" = P some keywords - N+G not for google but yahoo likes them meta "language" = P overrule guesswork by defining language - N no - G? meta "page-topic" = P topic/theme - N? - G? meta "abstract" = P short summary - N? - G? meta "copyright" = ? #### invented by me meta "audience" = P filteres audience: "+seniors, +parents, -children, -youth" meta "mood" = P specifies textual style: "discussion, informative, commercial, sexual, fictional, scientific, romantic, therapeutic, technical"

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• Announcement: DTrace for Oracle Linux General Availability

  - by Zeynep Koch

  Today we are announcing the general availability of DTrace for Oracle Linux. It is available to download from ULN for Oracle Linux Support customers.  DTrace is a comprehensive dynamic tracing framework that was initially developed for the Oracle Solaris operating system, and is now available to Oracle Linux customers. DTrace is designed to give operational insights that allow users to tune and troubleshoot the operating system. DTrace provides Oracle Linux developers with a tool to analyze performance, and increase observability into the systems they own to see how they work. DTrace enables higher quality applications development, reduced downtime, lower cost, and greater utilization of existing resources. Key benefits and features of DTrace on Oracle Linux include: • Designed to work on finding performance bottlenecks • Dynamically enables the kernel with a number of probe points, improving ability to service software • Enables maximum resource utilization and application performance • Fast and easy to use, even on complex systems with multiple layers of software If you already have Oracle Linux support, you can download DTrace from ULN channel. We have a dedicated Forum for DTrace on Oracle Linux, to discuss your experience and questions.

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• How to disable PHP's ini_set for specific configuration options?

  - by Dunedan

  I'm running a setup with PHP 5.3.8 and use php-fpm with it's chroot functionality to separate multiple customers. So each customer has it's own chrooted PHP-environment, which is quite fine. I now want to disallow that a customer can change the *memory_limit* of his PHP-instance by using *ini_set*. On the other hand I don't want to disable *ini_set* completely. So I'm searching for a possibility to disable the possibility to set specific PHP configuration options (like *memory_limit*) via *ini_set*. Does somebody know how to achieve that?

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• Unknown MySQL server host - connection problem

  - by Zukas

  I am new to databases and I have been asked to look at a few tables and see how many records they have and some other information. I cannot access phpMyAdmin through cPanel, which is how I've always done it on my own server. I decided to download MySQL Workbench. I enter in all the information is asks: Hostname: mysite.startlogicmysql.com Port: 3306 Username: user. I press connect and get this Unknown MySQL server host 'mysite.startlogicmysql.com' (11004) Am I using the wrong hostname? I've seen a server name, a hostname in the server variables list which is something like custsql.eigbox.net and the server itself is custsql.eigbox.net In both cases the custsql is a little different than what I posted. I am not sure which one to use. If there is anything else anyone needs to know I can tell you. Tanks.

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• How do I set the parental rating on a video?

  - by Les

  I can view the properties (right click, properties, details) of a video file and it has a field for parental rating. How can I add a rating to the file (the field is blank)? There is the problem that if I can add a rating, someone else may be able to change it to circumvent parental controls on a video player. This isn't of concern to me at this time. Edit: The file types are both .avi and .mpg. Edit 2: I own the file and have 'full control'.

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• Not receiving bounced emails from PHPList

  - by user1780242

  I am sending a test campaign to my own address and to a fictitious nonsense address and I am receiving the email at my account but I am not receiving any bounces. My settings in the config.php file are: $message_envelope = '[email protected]'; $bounce_protocol = 'pop'; $bounce_mailbox_host = 'localhost'; $bounce_mailbox_user = '[email protected]'; $bounce_mailbox_password = 'XXXXXX'; What's the next step in figuring out the problem? I also tried both variations of the following: $bounce_mailbox_port = "110/pop3/notls"; #$bounce_mailbox_port = "110/pop3"; I am running a Godaddy Centos 6 VPS and Plesk 11.

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• Go Big or Go Home

  - by user12601034

  For those who don’t know, Oracle sponsors a group called “OWL” – Oracle Women’s Leadership - and the purpose of the group is to create local and global opportunities that support, educate and empower current and future women leaders at Oracle. This week, I had the opportunity to attend the Denver OWL roadshow, and I was really impressed with the quality of speakers and interactions that I experienced. One theme that arose throughout the day was that of “Lean In.” In a nutshell, “Lean In” requires you to take advantage of the opportunities that you’re given. One of my personal mantras is “Go big or go home."  That is, if you’re not willing to give it your all, don’t do it at all. Regardless of how you phrase it, it’s a life lesson that I believe needs to be tossed in our face every so often simply, if for no other reason, to get our attention. You are given a finite amount of time in your life; in your job role; in your interactions with others. Do you make the most of the opportunities given to you every day? Or do you believe that life just happens, and you have to deal with whatever is handed to you? I have a challenge for you. Set aside any concerns or fears you have about something and Lean In. Make the most of an opportunity presented to you…or make your own opportunity! If you start with just one thing, you’ll start building a mindset to make the most of additional opportunities. Not only will you be better for leaning in, but I’m betting that those around you will be better for it as well.

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• Windows 7 Upgrade from an OEM disc

  - by user1026361

  I recently bought a new laptop with Windows 7 Home Premium and a Windows 7 Pro Upgrade key. It also comes with a cavalcade of bloatware. I would like to start with a fresh install of Windows. I understand that I can upgrade to W7Pro using the option in the Home Premium Start menu. However, I also own a Windows 7 Pro OEM installation disc from another computer. Can I use this Windows 7 Pro OEM disc to install Windows, and when it asks me for my key, provide the upgrade key purchased? Or am i required to install Home Premium first and then apply my upgrade key?

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• SQL SERVER – Get Free Books on While Learning SQL Server 2012 Error Handling

  - by pinaldave

  Fans of this blog are aware that I have recently released my new books SQL Server Functions and SQL Server 2012 Queries. The books are available in market in limited edition but you can avail them for free on Wednesday Nov 14, 2012. Not only they are free but you can additionally learn SQL Server 2012 Error Handling as well. My book’s co-author Rick Morelan is presenting a webinar tomorrow on SQL Server 2012 Error Handling. Here is the brief abstract of the webinar: People are often shocked when they see the demo in this talk where the first statement fails and all other statements still commit. For example, did you know that BEGIN TRAN…COMMIT TRAN is not enough to make everything work together? These mistakes can still happen to you in SQL Server 2012 if you are not aware of the options. Rick Morelan, creator of Joes2Pros, will teach you how to predict the Error Action and control it with & without structured error handling. Register for the webinar now to learn: How to predict the Error Action and control it Nuances between successful and failing SQL statements Essential SQL Server 2012 configuration options Register for the Webinar and be present during the webinar. My co-author will announce a winner (may be more than 1 winner) during the session. If you are present during the session – you are eligible to win the book. The webinar is scheduled for 2 different times to accommodate various time zones. 1) 10am ET/7am PT 2) 1pm ET/11am PT. Each webinar will have their own winner. You can increase your chances by attending both the webinars. Do not miss this opportunity and register for the webinar right now. The recordings of the webinar may not be available. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Joes 2 Pros, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority News, SQLServer, T SQL, Technology

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• Hosting custom domains with IP address flexibility

  - by F21

  I am building a small service where users will be assigned a subdomain such as: myusername.myservice.com anotheruser.myservice.com I know that I can set up a wildcard vhost and using some configuration regex, serve the files like so: myusername.myservice.com ===> /var/www/myusername anotherusername.myservice.com ===> /var/www/anotherusername The problem is that I would like to allow users to alias their own domain names to their service. I understand that for the webserver, once the user adds the domain via my web interface, I can easily create a vhost for the domain in nginx and then refresh the webserver. The problem is that I would prefer to NOT let the users add an A record of my webserver's IP address as I would prefer to keep things flexible (when we upgrade our infrastructure to something more complex to scale). What is the best way to achieve this?

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• What causes bad performance in consumer apps?

  - by Crashworks

  My Comcast DVR takes at least three seconds to respond to every remote control keypress, making the simple task of watching television into a frustrating button-mashing experience. My iPhone takes at least fifteen seconds to display text messages and crashes ¼ of the times I try to bring up the iPad app; simply receiving and reading an email often takes well over a minute. Even the navcom in my car has mushy and unresponsive controls, often swallowing successive inputs if I make them less than a few seconds apart. These are all fixed-hardware end-consumer appliances for which usability should be paramount, and yet they all fail at basic responsiveness and latency. Their software is just too slow. What's behind this? Is it a technical problem, or a social one? Who or what is responsible? Is it because these were all written in managed, garbage-collected languages rather than native code? Is it the individual programmers who wrote the software for these devices? In all of these cases the app developers knew exactly what hardware platform they were targeting and what its capabilities were; did they not take it into account? Is it the guy who goes around repeating "optimization is the root of all evil," did he lead them astray? Was it a mentality of "oh it's just an additional 100ms" each time until all those milliseconds add up to minutes? Is it my fault, for having bought these products in the first place? This is a subjective question, with no single answer, but I'm often frustrated to see so many answers here saying "oh, don't worry about code speed, performance doesn't matter" when clearly at some point it does matter for the end-user who gets stuck with a slow, unresponsive, awful experience. So, at what point did things go wrong for these products? What can we as programmers do to avoid inflicting this pain on our own customers?

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• Keyboard input system handling

  - by The Communist Duck

  Note: I have to poll, rather than do callbacks because of API limitations (SFML). I also apologize for the lack of a 'decent' title. I think I have two questions here; how to register the input I'm receiving, and what to do with it. Handling Input I'm talking about after the fact you've registered that the 'A' key has been pressed, for example, and how to do it from there. I've seen an array of the whole keyboard, something like: bool keyboard[256]; //And each input loop check the state of every key on the keyboard But this seems inefficient. Not only are you coupling the key 'A' to 'player moving left', for example, but it checks every key, 30-60 times a second. I then tried another system which just looked for keys it wanted. std::map< unsigned char, Key keyMap; //Key stores the keycode, and whether it's been pressed. Then, I declare a load of const unsigned char called 'Quit' or 'PlayerLeft'. input-BindKey(Keys::PlayerLeft, KeyCode::A); //so now you can check if PlayerLeft, rather than if A. However, the problem with this is I cannot now type a name, for example, without having to bind every single key. Then, I have the second problem, which I cannot really think of a good solution for: Sending Input I now know that the A key has been pressed or that playerLeft is true. But how do I go from here? I thought about just checking if(input-IsKeyDown(Key::PlayerLeft) { player.MoveLeft(); } This couples the input greatly to the entities, and I find it rather messy. I'd prefer the player to handle its own movement when it gets updated. I thought some kind of event system could work, but I do not know how to go with it. (I heard signals and slots was good for this kind of work, but it's apparently very slow and I cannot see how it'd fit). Thanks.

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• Alternative, more efficient scraping method for a noncoder, than Google doc's importxml and xpath?

  - by binarybunny

  I've searched throughout the net for a simple solution, but it seems everyone has their own unique method (coding language) of achieving this. I'm only just beginning to learn Linux, and my coding skills are thoroughly lacking (non-existent). I love the simplicity of using importxml and xpath, but copying and pasting values after reaching the spreadsheet limit of 50 is getting old. Now that I've seen the light, I would really just like to know of a simple, yet scalable solution to get more data into more spreadsheets/databases. Before I really start getting my hands dirty, I would love to know some of the ways you guys go about accomplishing this?

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• Missing eth0 configuration file

  - by Godric Seer

  I have two servers both running Scientific Linux 6 on the same network. Since I want SSH access to both of them, I want to give them both static IPs so I can setup port forwarding and not worry how my router assigns local IPs. I found that I need to edit the configuration file /etc/network-scripts/ifcng-eth0, however that file does not exist. The network card works fine, and I am able to ssh as long as I access the router and find the local ip. Can I simply make my own configuration file, or did I miss some step in configuring the system that I need to complete?

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• How much should I charge for setting up a client web server? [closed]

  - by Vincent

  I have quite the eccentric client who wants to move all his ecommerce websites (about 5-10, all PHP/MySQL) to his own web server that I'm supposed to build. He doesn't want to hear anything about VPS hosting and all the issues and expenses related to owning a server. My responsibility would be to buy all the hardware, install and configure software, etc. How much should I charge for this? I'm planning to start with two relatively moderate Dell PowerEdge C2100 servers, one for web (NGINX), one for db (MySQL).

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• make vnc server listen on guest's ip address

  - by gucki

  My host system has the IP 192.168.0.250. Now I want to create a kvm guest using a tap device (so the network card of the guest just acts like a "real" one). The guest has a static ip 192.168.0.249 which it setups on his own (no dhcp). To connect to the guest using VNC I can to use the host's IP. So far everything works fine. Now I wonder how I can make the VNC server to listen on the guest's IP address, so I can use the guest's IP address to connect using my vnc client. Of course I cannot use -vnc 192.168.0.249:1 as this IP is not active on the host and so fails with Cannot assign requested address. Can this be done with tap networking at all? If not, how to get it working?

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• Data validation best practices: how can I better construct user feedback?

  - by Cory Larson

  Data validation, whether it be domain object, form, or any other type of input validation, could theoretically be part of any development effort, no matter its size or complexity. I sometimes find myself writing informational or error messages that might seem harsh or demanding to unsuspecting users, and frankly I feel like there must be a better way to describe the validation problem to the user. I know that this topic is subjective and argumentative. StackOverflow might not be the proper channel for diving into this subject, but like I've mentioned, we all run into this at some point or another. There are so many StackExchange sites now; if there is a better one, feel free to share! Basically, I'm looking for good resources on data validation and user feedback that results from it at a theoretical level. Topics and questions I'm interested in are: Content Should I be describing what the user did correctly or incorrectly, or simply what was expected? How much detail can the user read before they get annoyed? (e.g. Is "Username cannot exceed 20 characters." enough, or should it be described more fully, such as "The username cannot be empty, and must be at least 6 characters but cannot exceed 30 characters."?) Grammar How do I decide between phrases like "must not," "may not," or "cannot"? Delivery This can depend on the project, but how should the information be delivered to the user? Should it be obtrusive (e.g. JavaScript alerts) or friendly? Should they be displayed prominently? Immediately (i.e. without confirmation steps, etc.)? Logging Do you bother logging validation errors? Internationalization Some cultures prefer or better understand directness over subtlety and vice-versa (e.g. "Don't do that!" vs. "Please check what you've done."). How do I cater to the majority of users? I may edit this list as I think more about the topic, but I'm genuinely interest in proper user feedback techniques. I'm looking for things like research results, poll results, etc. I've developed and refined my own techniques over the years that users seem to be okay with, but I work in an environment where the users prefer to adapt to what you give them over speaking up about things they don't like. I'm interested in hearing your experiences in addition to any resources to which you may be able to point me.

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