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• Better performance with memcached cluster or local memcaches?

  - by Nicholas Tolley Cottrell

  I have a small cluster of servers balancing a Java web app. Currently I have 3 memcached servers caching data and all web apps shares all 3 memcached instances. I often get strange slowdowns and timeouts to some of the memcacheds and I wondering if there is a good way of analyzing the performance. I am wondering whether my iptables rules (or some other system limitation) are blocking/slowing connections. I am considering reconfiguring the web apps so that they only query the memcached process on their own localhost.

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• Multi-Application Server Environment and Memcached Security

  - by jocull

  We are looking to integrate Memcached into our infrastructure, but have a security concern before we do. We run several platforms including ASP.NET and Coldfusion and have many app developers working many little applications across the different platforms. The concern is this: App A places item "dog" into cache. App B reads item "dog" (or worse: App B updates item "dog") After this happens, App A either retrieves bad information, or has already had its information viewed, aka "stolen". What we would like to do is make it so that each app can only interact with its own sandbox, and may not interfere with or read other application's data. Is this possible? Thanks.

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• Why We Need UX Designers

  - by Tim Murphy

  Ok, so maybe this is really why I need UX designers.  While I have always had an interest in photography and can appreciate a well designed user interface putting one together is an entirely different endeavor.  Being color blind doesn’t help, but coming up with ideas is probably the biggest portion of the issue.  I can spot things that just don’t look like they work right, but what will? UX designers is an area that most companies do not spend much if any resources.  As they say, you only get one chance to make a first impression and and a poorly designed site or application is a bad first impression.  Given that they you would think that companies would invest more in appearance and usability. One of two things need to be done to rectify this issue.  Either we need to start educating our developers on user experience and design or we need to start finding ways to subsidize putting full time designers on our project teams.  Maybe it should be a time share type of situation, but something needs to be done.  As architects we need to impress on our project stakeholders the importance of User Experience and why it should be part of the budget.  If they hear it often enough eventually they may present it to you as their own idea. del.icio.us Tags: User Experience,UX,Application Design

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• Adding multiple Exchange accounts under one profile in Outlook 2010 or 2013

  - by Karel Smutný

  I work for two companies, each having own Exchange Server. I want to configure my Outlook for both email accounts. I am not able to add both accounts under the same profile in Outlook 2010, nor 2013. I found some how-to articles, each involving Office Configuration Tool. However, my installation does not support this tool. I have Office 2010 Home and Business, and Office 2013 Preview click-to-run. Is there another way? P.S. Having two different profiles, one for each Exchange account, is inconvenient. I cannot run two instances of Outlook at the same time and switching all the time is tedious.

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• Doing powerups in a component-based system

  - by deft_code

  I'm just starting really getting my head around component based design. I don't know what the "right" way to do this is. Here's the scenario. The player can equip a shield. The the shield is drawn as bubble around the player, it has a separate collision shape, and reduces the damage the player receives from area effects. How is such a shield architected in a component based game? Where I get confused is that the shield obviously has three components associated with it. Damage reduction / filtering A sprite A collider. To make it worse different shield variations could have even more behaviors, all of which could be components: boost player maximum health health regen projectile deflection etc Am I overthinking this? Should the shield just be a super component? I really think this is wrong answer. So if you think this is the way to go please explain. Should the shield be its own entity that tracks the location of the player? That might make it hard to implement the damage filtering. It also kinda blurs the lines between attached components and entities. Should the shield be a component that houses other components? I've never seen or heard of anything like this, but maybe it's common and I'm just not deep enough yet. Should the shield just be a set of components that get added to the player? Possibly with an extra component to manage the others, e.g. so they can all be removed as a group. (accidentally leave behind the damage reduction component, now that would be fun). Something else that's obvious to someone with more component experience?

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• Network vulnerability and port scanning services

  - by DigitalRoss

  I'm setting up a periodic port scan and vulnerability scan for a medium-sized network implementing a customer-facing web application. The hosts run CentOS 5.4. I've used tools like Nmap and OpenVAS, but our firewall rules have special cases for connections originating from our own facilities and servers, so really the scan should be done from the outside. Rather than set up a VPS or EC2 server and configuring it with various tools, it seems like this could just be contracted out to a port and vulnerability scanning service. If they do it professionally they may be more up to date than something I set up and let run for a year... Any recommendations or experience doing this?

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• Python or Ruby in 2011.

  - by Sleeper Smith

  What I'm really asking is, in the current services and technologies provided, which is a more "useful" language? Which one has more opportunity? Some background info first. I'm a .net C# dev for 5 years. Having done a few projects on Amazon AWS, I'm looking to start a few projects of my own. But Azure's too expensive, and AWS has too much management overhead. My current choice is Google App Engine and Python. Logical enough. But what I want to ask here is this: In Linux world, which is more useful? Recently heard about Heroku for Ruby. How viable is this? Looking at the pricing model indicates that it's more expensive. Which one has more up-to-date and exciting open source projects? For instance Trac is just plain out dated compared to Redmine. One of the big reason pulling me for Ruby is Redmine. Implementations? IronPython/IronRuby/JRuby etc etc. Which one is more standardised and more implementation agnostic? Which one is easier to port between Windows/Linux? Anyway, your input and thoughts are greatly appreciated. thanks.

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• Best way to let users choose country/language when submiting an URL to a directory

  - by Claudiu

  Hi all, I want to offer the user the possibility to add the country/language for websites they would submit to a fairly simple website directory. I have a folder with flags from http://www.famfamfam.com/lab/icons/flags/ . The flag images are named according to the ISO 3166-1 alpha-2 country codes, meaning that I could make a PHP script that would be able to retrieve images and the name of the country retrieved from the image name (not the full name, but it wouldn't be necessary). Just to make things clearer, I couldn't find a proper combo-box jQuery plugin for my needs (that would act exactly like the native but with an icon before the text) and don't really have the time to develop one on my own. Considering the number of images, I also wouldn't just display them all with a radio box near them. Also, having a classic drop-down list would be a nightmare for me as I would have to assign the short country name manually to each entry, or do it once for every country. Offering the user a dropdown list with the short country names but no flag near them would also be unfriendly and confusing. The idea is that every website featured in the directory would have the country flag icon near it. I have the images named properly but I don't know how to let the user choose the right image for their website. Any idees? Thank you all in advance! EDIT Temporary solution is this file: http://www.andrewpatton.com/countrylist.csv It contains a list of countries including various other info, like the short country name, the same name that's used for the flag images. I can take that information and have a classic like this: <select name="countries"> <option value="ro">Romania</option> <option value="ie">Ireland</option> <!-- and so on --> </select> Still, If anybody has a better idea...

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• Doing powerups in a component-based system

  - by deft_code

  I'm just starting really getting my head around component based design. I don't know what the "right" way to do this is. Here's the scenario. The player can equip a shield. The the shield is drawn as bubble around the player, it has a separate collision shape, and reduces the damage the player receives from area effects. How is such a shield architected in a component based game? Where I get confused is that the shield obviously has three components associated with it. Damage reduction / filtering A sprite A collider. To make it worse different shield variations could have even more behaviors, all of which could be components: boost player maximum health health regen projectile deflection etc Am I overthinking this? Should the shield just be a super component? I really think this is wrong answer. So if you think this is the way to go please explain. Should the shield be its own entity that tracks the location of the player? That might make it hard to implement the damage filtering. It also kinda blurs the lines between attached components and entities. Should the shield be a component that houses other components? I've never seen or heard of anything like this, but maybe it's common and I'm just not deep enough yet. Should the shield just be a set of components that get added to the player? Possibly with an extra component to manage the others, e.g. so they can all be removed as a group. (accidentally leave behind the damage reduction component, now that would be fun). Something else that's obvious to someone with more component experience?

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• Sort algorithms that work on large amount of data

  - by Giorgio

  I am looking for sorting algorithms that can work on a large amount of data, i.e. that can work even when the whole data set cannot be held in main memory at once. The only candidate that I have found up to now is merge sort: you can implement the algorithm in such a way that it scans your data set at each merge without holding all the data in main memory at once. The variation of merge sort I have in mind is described in this article in section Use with tape drives. I think this is a good solution (with complexity O(n x log(n)) but I am curious to know if there are other (possibly faster) sorting algorithms that can work on large data sets that do not fit in main memory. EDIT Here are some more details, as required by the answers: The data needs to be sorted periodically, e.g. once in a month. I do not need to insert a few records and have the data sorted incrementally. My example text file is about 1 GB UTF-8 text, but I wanted to solve the problem in general, even if the file were, say, 20 GB. It is not in a database and, due to other constraints, it cannot be. The data is dumped by others as a text file, I have my own code to read this text file. The format of the data is a text file: new line characters are record separators. One possible improvement I had in mind was to split the file into files that are small enough to be sorted in memory, and finally merge all these files using the algorithm I have described above.

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• Is there a way to set up an SMTP relay that allows users of a web app to have the web app send email

  - by mic

  the web service sends out emails on behalf of the users to their customers. So [email protected] uses webservice and webservice sends emails . The emails should be appearing as coming from [email protected]. Currently what we are trying to do is to configure webservice to act as an email client for each user, each user being able to create their own profile in which they need to configure their smtp server credentials. But given that there are more options for configurations than you can shake your stick at -not to mention trying to explain to users what info to get from where, POP b4 smtp, TLS, SSL, AUTH,etc) I am wondering if there could be a different way. How, if at all could this be approached? Can I set up a postfix server to do what I need to without running into another admin. nightmare or being blocked for spamming? Thank you for your insights

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• Wrong Sound Blaster's PCI ID within Windows

  - by pavian

  I own Sound Blaster X-Fi Titanium, it was working with no problems under Linux or Windows 7. It's original PCI ID is 1102:000b but now I see different within MS Windows. BIOS setup: 1102:000b GNU/Linux: 1102:000b Windows 7: 1102:000d Windows 8: 1102:000d In last days I'm experimenting with IOMMU PCI passthrough in Xen and I tried to pass this device to virtual Windows 7 and 8. Here I found this problem. I don't know if this is just coincidence or reason of my problem but it's wrong even in physical system. Windows detects 1102:000d as a High Definition Audio sound device (I guess this name, I have localized Windows, but this is general name, the same was with Realtek HDA before drivers), it's playing but it's unstable (Windows speaker testing can crash that application) and I can't install Creative software. Used driver is hdaudio.sys. Booting in BIOS or UEFI mode doesn't change anything. Nor CMOS clean. Someone met the same problem.

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• Forum engine with full LDAP integration [closed]

  - by Andrian Nord

  We are looking for forum engine which may actually maintain user data into LDAP, maybe via mods. Core point is about ability to maintain the data, i.e. all user profile settings, like nickname, password, email, avatar, birthday and others (preferably configurable). One example of good ldap integration, level of which I'm expecting, is drupal's ldap integration, which allows to map any user's attribute into ldap and keeps it in sync with database. Year ago I've done a small research over existing Free&FOSS engines and find out few forum engines with LDAP integration, namely SFM, phpBB and something else. The most maintained solution were provided by phpBB3, which supports LDAP integration out-of-box, but it is unable to sync data with changes in LDAP server made by other software. Actually it wasn't even propagating changes back, I'm not saying about ability to map additional attributes (other than name/password/email). Also, I haven't found any forum with architecture which have proper abstraction over user settings, thus I doubt that this engines (including phpBB) are possible to mod such functionality without introducing dramatic changes into core codebase. More recent research showed that even some commercial software, like IPB is unable to keep it's database synced with LDAP directory and map additional attributes. In other words, all support I've seen so far is simple user creation upon first user's login, which is not good for us, as forum is not primary site and should not maintain it's own users base (to reduce risk of possible collisions). LDAP import is required due to many other services (ftp, email, jabber, drupal site) using same users base. Currently we have forum embedded into Drupal site, but we are unsatisfied with it's features. BTW, we are using Linux and this is not duplicate of this question, as it's author seems to be satisfied with behaviour described above. So, my question is: Are there any (preferably FOSS&free) forum engines that may import, export, keep in sync, or otherwise integrade with LDAP user database (preferably with ability to map additional fields to ldap attributes)?

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• Preffered lambda syntax?

  - by Roger Alsing

  I'm playing around a bit with my own C like DSL grammar and would like some oppinions. I've reserved the use of "(...)" for invocations. eg: foo(1,2); My grammar supports "trailing closures" , pretty much like Ruby's blocks that can be passed as the last argument of an invocation. Currently my grammar support trailing closures like this: foo(1,2) { //parameterless closure passed as the last argument to foo } or foo(1,2) [x] { //closure with one argument (x) passed as the last argument to foo print (x); } The reason why I use [args] instead of (args) is that (args) is ambigious: foo(1,2) (x) { } There is no way in this case to tell if foo expects 3 arguments (int,int,closure(x)) or if foo expects 2 arguments and returns a closure with one argument(int,int) - closure(x) So thats pretty much the reason why I use [] as for now. I could change this to something like: foo(1,2) : (x) { } or foo(1,2) (x) -> { } So the actual question is, what do you think looks best? [...] is somewhat wrist unfriendly. let x = [a,b] { } Ideas?

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• Group Policy for IE Security Zones

  - by Doug Luxem

  We are currently using the following Group Policy to control the Internet Explorer security zones: User Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page Then setting the Site to Zone Assignment List with the various values using the following chart: Value Setting ------------------------------ 0 My Computer 1 Local Intranet Zone 2 Trusted sites Zone 3 Internet Zone 4 Restricted Sites Zone This works well; however, users are then unable to edit (or especially add) to their zone settings. Is there a way to lock in our custom zone settings while still giving users the ability to add their own sites to the security zones? Yes, I do realize the slight security risk in opening this up.

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• Development teams do not scale

  - by Matt Watson

  Recently I have been thinking about how development teams don't scale very well. The bigger a team and the product get, the more time the team spends fixing software bugs. This means they spend more time doing troubleshooting and debugging as the grow. The problem is that since developers don't typically have access to production servers, there is a bottleneck in the process when doing production troubleshooting.For a team that has 10 developers, I would guess than 0-2 of them have access to production servers. If that team grows to 20 people, it is probably the same 0-2 people that have production access still. This means that those 2 key people are a bottleneck and the team does not scale correctly as you add more resources. All those new developers want is to help track down and fix software bugs, but they don't have the visibility to do it. So they end up being less productive and frustrated because they really want to fix the problems. The people who do have production access end up spending too much of their time doing troubleshooting instead of working on new projects.The solution is to remove the bottlenecks and get those people working on more important tasks. Stackify can solve this problem by giving all the developers read only access to production servers. This allows them to access the information they need to do troubleshooting on their own.

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• determine what is invoking refresh/F5 in WinXP?

  - by Chris Hulan

  My laptop recently started invoking refresh (F5) on its own. Works OK from start-up/reboot but then for no apparent reason will start refreshing Initially thought it was a web page scripting issue, as I noticed it while browsing. But then found it occurs with the browser closed. Not sure if this could be a hardware issue, or some silly virus, or just a bug? Would like a utility that could tell me what device/program is invoking the refresh. Any ideas? thanks

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• NIC bonding with two uplinks

  - by Karolis T.

  Is bonding the preferred way of implementing ISP redundancy? In the texts I've seen, bond device has a netmask, gateway of it's own. How can this be obtained if there are two different gateways from two uplinks, which one to choose? Do I need any special routing rules to go with it or does simply configuring separate interfaces (using Debian, /etc/network/interfaces), i.e eth1, eth2 for their corresponding uplinks and bonding them to bond0 handle routing automatically? If I want to NAT client machines, do they use bond device's IP as a gateway? Does the bond0 device is the device that goes into iptables nat rules? Thanks

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• Excel 2007 Constantly Creating Custom Cell Styles

  - by Nick

  Hello, I've been using Office 2007 for a few months now and have noticed that it was creating duplicate custom cell styles on its own, like Normal 2, Normal 3, etc. It didn't really bother me at first, but now Excel will lag when I open the cell styles menu as it gathers well over a hundred of these duplicates (I have seen Normal 54 and Normal 5 2 2 so I'm unsure as to how many there actually are). I have also just checked a fresh Excel sheet, and it only has the defaults, but one I created earlier today from scratch has the Normal 54 listed. My questions are: Why is this happening? Can I delete a temp or custom settings file somewhere to clear this? Any help on this is appreciated.

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• who has the best online prep MCSE study materials?

  - by phill

  I'm studying for my Microsoft Certified Systems Engineer (MCSE) on my own and was wondering who you could recommend for study materials? I did shell out a bunch of money for a local class and when it came to taking the test, there were a slew of topics which weren't even covered. For example, in my 070-293 test, they didn't even touch such as Certificates, how to setup clusters, sql server clustering, etcs. I realize there is a bunch out there such as cbtnuggets, preplogic, etcs. Which online preps do you suggest best preps you for the tests before I spend any more money on this stuff? thanks in advance

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• Tomcat - virtualhosting - name / ip / port - based

  - by lisak

  Hey, what are the usage scenarios for these kinds of virtual hosting ? Name Based - typical tomcat virtual hosting, one HOME instance with many contexts, each as an individual host IP based / port based - multiple instances of tomcat ( how is it with performance and memory consuption?) running on IP aliases (virtual IPs) for one network adapter, usually behind http apache server that can run name based virtual hostings. Otherwise I can't figure out how would I forward requests in iptables/firewall based on IP address, which is just one. How is IP based virtual hosting done as to Tomcat and multiple instances ? I'd like to hear some usage scenarios from your experience. How are you running your applications. Cause there are applications having it's own modified classloader and they are developed in a way to run alone withing a tomcat instance. Then there are trivial applications which can run within one instance without problems. Many thanks

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• Gödel, Escher, Bach - Gödel's string

  - by Brad Urani

  In the book Gödel, Escher, Bach: An Eternal Golden Braid by Douglas Hofstadter, the author gives us a representation of the precursor to Gödel's string (Gödel's string's uncle) as: ~Ea,a': (I don't have the book in front of me but I think that's right). All that remains to get Gödel's string is to plug the Gödel number for this string into the free variable a''. What I don't understand is how to get the Gödel number for the functions PROOF-PAIR and ARITHMOQUINE. I understand how to write these functions in a programming language like FlooP (from the book) and could even write them myself in C# or Java, but the scheme that Hofstadter defines for Gödel numbering only applies to TNT (which is just his own syntax for natural number theory) and I don't see any way to write a procedure in TNT since it doesn't have any loops, variable assignments etc. Am I missing the point? Perhaps Gödel's string is not something that can actually be printed, but rather a theoretical string that need not actually be defined? I thought it would be neat to write a computer program that actually prints Gödel's string, or Gödel's string encoded by Gödel numbering (yes, I realize it would have a gazillion digits) but it seems like doing so requires some kind of procedural language and a Gödel numbering system for that procedural language that isn't included in the book. Of course once you had that, you could write a program that plugs random numbers into variable "a" and run procedure PROOF-PAIR on it to test for theoromhood of Gödel's string. If you let it run for a trillion years you might find a derivation that proves Gödel's string.

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• How to hire support people?

  - by Martin

  I manage a tech support team at a mid-sized software company. We are the last line of support, so issues that we can't fix need to be escalated to the development team. When I joined the company, our team wasn't capable of much beyond using a specific set of troubleshooting steps to solve known issues and escalating anything else to the developers. It's always been a goal of mine for our team to shoulder as much of the support burden as possible without ever bothering a developer. Over the past few years, I, along with several new hires I've made, have made pretty good progress in that direction. We've coded our own troubleshooting tools which now ship with several of our products. When users have never-before-seen issues, we analyze stack traces and troubleshoot down to the code level, and if we need to submit a bug, half the time we've already identified in the code where in the code the bug is and offered a patch to fix it. Here's the problem I've always had: finding support people capable of the work I've described above is really difficult. I've hired 3 people in the past 3 years, and I've probably looked at several thousand resumes and conducted several hundred phone screens to do so. I know it's pretty well accepted that hiring good people is tough in the tech industry, but it seems that support is especially difficult -- there are clearly thousands of people walking around calling themselves support analysts, but 99%+ of them seemingly aren't capable of anything beyond reading a script. I'm curious if anyone has experience recruiting the sort of folks I'm talking about, and if you have any suggestions to share. We've tried all sorts of things -- different job titles/descriptions, using headhunters, etc. And while we've managed to hire a few good folks, it's basically taken us a year to find an appropriate candidate for each opening we've had, and I can't help but wonder if there's something we could be doing differently.

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• Is it possible to install Windows Server 2012 on a Dell PowerEdge with PERC S100 card?

  - by Warren P

  According to Dell's own website, the Windows Server 2012 media driver "inbox" does not contain drivers for the Perc S100 controller that is in a Dell PowerEdge T110 II server we'd like to evaluate with Server 2012. I have found drivers only for Server 2008 R2, which is what the server is currently running. Is it possible to upgrade this server? (Booting up the Server 2012 DVD image leads to the expected result that it can not locate the system's hard drives or its hard drive controller card, as the drivers for the PERC S100 are not on the installation DVD image.)

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• How Often Do Windows Servers Need to be Restarted?

  - by Evan

  A little background: We have several Windows servers (2003, 2008) for our department. We're a division of IT so we manage our own servers. Of the four of us here I'm the only one with a slight amount of IT knowledge. (Note the "slight amount".) My boss says the servers need to be restarted at least weekly. I disagree. Our IT Department says that because she restarts them constantly that's the reason why our hard drives fail and power supplies go out on them. (That's happened to a few of our servers a couple times over the last four years, and very recently.) So the question is: How often does everyone restart their Windows servers? Is there an industry standard or recommendation? Is our IT department correct in saying that because we re-start that's why we're having hardware issues? (I need a reason if I'm going to change her mind!)

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