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• Can a 32-bit RHEL4 userland work with a 64-bit kernel?

  - by James

  Is there a way to change an i386 RHEL4 machine to run an amd64 kernel, but ensure that it still builds software into same i386 binaries? On Debian this seems quite straightforward: just install an amd64 kernel (worst case, build one like this guy: http://www.debian-administration.org/users/jonesy/weblog/1) and prefix everything with "linux32". Then everything that considers uname -m will be unchanged, I just need to handle the few cases that consider uname -r. What is the Red Hat equivalent? Is the only way a full 64-bit installation on another disk and then chrooting back to the 32-bit system before anyone builds anything? (Even the best examples of that seem to be Debian-based.) Background: We make a large system that runs on (a variant of) i386 RHEL4. However, some of the larger RHEL build machines now have enough RAM that they might benefit from going 64-bit (for the kernel and maybe some of the bigger build steps). Our build system doesn't support cross-compilation.

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• XNA hlsl tex2D() only reads 3 channels from normal maps and specular maps

  - by cubrman

  Our engine uses deferred rendering and at the main draw phase gathers plenty of data from the objects it draws. In order to save on tex2D calls, we packed our objects' specular maps with all sorts of data, so three out of four channels are already taken. To make it clear: I am talking about the assets that come with the models and are stored in their material's Specular Level channel, not about the RenderTarget. So now I need another information to be stored in the alpha channel, but I cannot make the shader to read it properly! Nomatter what I write into alpha it ends up being 1 (255)! I tried: saving the textures in PNG/TGA formats. turning off pre-computed alpha in model's properties. Out of every texture available to me (we use Diffuse map, Normal Map and Specular Map) I was only able to read alpha successfully from the Diffuse Map! Here is how I add specular and normal maps to my model's material in the content processor: if (geometry.Material.Textures.ContainsKey(normalMapKey)) { ExternalReference<TextureContent> texRef = geometry.Material.Textures[normalMapKey]; geometry.Material.Textures.Remove("NormalMap"); geometry.Material.Textures.Add("NormalMap", texRef); } ... foreach (KeyValuePair<String, ExternalReference<TextureContent>> texture in material.Textures) { if ((texture.Key == "Texture") || (texture.Key == "NormalMap") || (texture.Key == "SpecularMap")) mat.Textures.Add(texture.Key, texture.Value); } In the shader I obviously use: float4 data = tex2D(specularMapSampler, TexCoords); so data.a is always 1 in my case, could you suggest a reason?

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• What can be the cause of new bugs appearing somewhere else when a known bug is solved?

  - by MainMa

  During a discussion, one of my colleagues told that he has some difficulties with his current project while trying to solve bugs. "When I solve one bug, something else stops working elsewhere", he said. I started to think about how this could happen, but can't figure it out. I have sometimes similar problems when I am too tired/sleepy to do the work correctly and to have an overall view of the part of the code I was working on. Here, the problem seems to be for a few days or weeks, and is not related to the focus of my colleague. I can also imagine this problem arising on a very large project, very badly managed, where teammates don't have any idea of who does what, and what effect on other's work can have a change they are doing. This is not the case here neither: it's a rather small project with only one developer. It can also be an issue with old, badly maintained and never documented codebase, where the only developers who can really imagine the consequences of a change had left the company years ago. Here, the project just started, and the developer doesn't use anyone's codebase. So what can be the cause of such issue on a fresh, small-size codebase written by a single developer who stays focused on his work? What may help? Unit tests (there are none)? Proper architecture (I'm pretty sure that the codebase has no architecture at all and was written with no preliminary thinking), requiring the whole refactoring? Pair programming? Something else?

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• Choosing open source vs. proprietary CMS

  - by jkneip

  Hi- I've been tasked with redesigning a website for a small academic library. While only in charge of the site for 6 months, we've been maintaining static html pages edited in Dreamweaver for years. Last count of our total pages is around 400. Our university is going with an enterprise level solution called Sitefinity, although we maintain our own domain and are responsible to maintain our own presense. Some background-my library has a couple Microsoft IIS servers on which this static html site has been running. I'm advocating for the implementation of a CMS while doing this redesign. The problem is I'm basically the lone webmaster so I have no one to agree or disagree with my choice. There are also only 1-2 content editors right know for the site but a CMS could change that factor. I would like to use the functionality of having servers that run .NET and MS SQL but am more experience setting up and maintaining open source software like Wordpress or Drupal on web hosts. My main concern is choosing a CMS that will be easy to update / maintain / deal with upgrades (i.e., support) in case I'm not there in the future. So I'm wondering how to factor in the open source CMS vs. a relatively inexpensive commercial CMS decision and whether choosing PHP/MySQL vs. ASP.net framework for development environment will play into my decision. Thanks for any input that can be offered based on the details I've given. Thanks, Jason

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• What hardware makes a good MongoDB Server ? Where to get it ?

  - by João Pinto Jerónimo

  Suppose you're on dell.com right now and you're buying a server to run your MongoDB database for your small startup. You will have to handle literally tens of thousands of writes and reads per minute (but small objects). Would you go for 2 processors ? Invest more on RAM ? I've heard (correct me if I'm wrong) MongoDB handles the most it can on the RAM and then flushes everything to the disk, in that case I should invest on a CPU with a large L2 cache, probably 40GB of RAM and a solid state drive.. right ? Would I be better off with a high end (~$11,309, 2 expensive processors, 96GB of RAM) server or 2x(~$6,419, 2 expensive processors, 12GB of RAM) servers ? Is Dell ok or do you have better sugestions ? (I'm outside the US, on Portugal)

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• Brightness too dark or too bright

  - by YatharthROCK

  Basically, below a seemingly-arbitrary threshold (seems to be around 60%) my laptop screen is too dark to really make out much, and above that threshold it takes its maximum brightness (which is waay too bright for my eyes). This problem only occurs when I change the brightness using Windows' UI. Changing the brightness using Fn keys on my keyboard works as expected; unless the screen went into dark mode because of Windows, in which case they have no effect. This problem started occuring on my ASUS laptop very recently. My laptop has a poor battery, but I don't think that's related. What is going on? I tried resetting power plan settings, turning off adaptive brightness and restarting. I'll give any info asked for. Help required urgently...

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• Why my AD domain doesn't work on my laptop

  - by Frederick Marcoux

  I have installed Windows Server 2008 R2 on a virtual machine with a bridged network card and installed Active Directory. I configured it and when I try to connect my laptop to the domain name, in this case, creationsmicroweb.ca (doesn't exist, don't try, for local only), I can't get connected. My laptop just doesn't see it. I don't know why! There's a resume of my config: Domain Name: creationsmicroweb.ca Forest: new, principal domain controller IP: Fixed (192.168.1.100) DNS Name: none (just for local, I ignored them) NETBIOS name: MICROWEB If someone as found why, please help me! This is for my business that I'm starting and I can't find why it doesn't work!

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• Checking whether product key will work with SBS 2003

  - by Rob Nicholson

  We've recently absorbed a small company who had a Dell PowerEdge server running SBS 2003. For some reason, the hard disks have been wiped. We have the product key though from the sticker on the side of the case but not the installation media: Win SBS Std 2003 1-2 CPU 5-CAL OEM software We do have a Dell labelled set of four CDs labelled SBS 2003 in our store and I've built a VM from this media but it doesn't prompt for the product key during install. Is there any way to ascertain whether this media will work with this product key without going through activation? I know one can activate several times but would prefer to check we've got the right media before doing this. Thanks, Rob.

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• I've created a software RAID on SUSE EL 10 and now I need to monitor it.......

  - by Thomas B.

  I have created a Software Raid using the yast2 GUI on SUSE ES 10/11. The raid works great and it's a raid 5. I have 5 Drives they are cheap 2GB Cases that have 2 - 1TB Drives in each case (Serial ATA Drives) and I connect them in via Esata to the motherboard. The problem I have as this is "cheap" storage when of the the 5 drives goes out on the RAID I seem to have no logs of any issues and it get's harder and harder to write to it until it dies. I use SAMBA to mount the 4TB parition to my PC's in my home on a GIG network. My question is this, are there any good (Free) tools in Linux to monitor a raid or the drives on the raid to detect any problems??? I haven't found any yet and was just wondering if some exist.

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• Triangulating a partially triangulated mesh (2D)

  - by teodron

  Referring to the above exhibits, this is the scenario I am working with: starting with a planar graph (in my case, a 2D mesh) with a given triangulation, based on a certain criterion, the graph nodes are labeled as RED and BLACK. (A) a subgraph containing all the RED nodes (with edges between only the directly connected neighbours) is formed (note: although this figure shows a tree forming, it may well happen that the subgraph contain loops) (B) Problem: I need to quickly build a triangulation around the subgraph (e.g. as shown in figure C), but under the constraint that I have to keep the already present edges in the final result. Question: Is there a fast way of achieving this given a partially triangulated mesh? Ideally, the complexity should be in the O(n) class. Some side-remarks: it would be nice for the triangulation algorithm to take into account a certain vertex priority when adding edges (e.g. it should always try to build a "1-ring" structure around the most important nodes first - I can implement iteratively such a routine, but it's O(n^2) ). it would also be nice to reflect somehow the "hop distance" when adding edges: add edges first between the nodes that were "closer" to each other given the start topology. Nevertheless, disregarding the remarks, is there an already known scenario similar to this one where a triangulation is built upon a partially given set of triangles/edges?

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• Learning Programming during the job?

  - by Hossein

  Introduction: I have read and heard advice, about learning programming by accepting programming projects. I need real assistance to understand this, because: Problem: Although, it would seem to me that one would gain much more technical knowledge by doing, real world projects, if one doesn't know much about a technology, it would add much more risk to the actual delivery of the final product! Even the smallest of real world projects could be too much for a newbie. There is a contradiction here: You need to know the job to do it! and It's recommended to do the job, in order to learn it! Question: Any personal experiences in this case would be very pleasant to know while describing: How new was the subject to you? didn't have a clue at all? Or, did you have experience with similar technologies? Was it a solo project or were you in a team? If team, then did others help you with learning it? Did it work as expected? Did you deliver on time? Do you recommend this approach to others as well?

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• How to make a vm scale when demand for resource increases

  - by Cray XT3

  i am having a server with 16 virtual core and 24G RAM,using Xen virtualization and ubuntu as dom0 Created 4 VMs (in para mode),each with different applications. CPU Load vary on each vm,somtimes first vm reaches nearly 100% CPU and others under 25% or even less. So is there a way in which vm can get cpu from other vms when they are not actually using it or utilization is under 25%.Same in the case of RAM also. I am not sure whether i am mentioning Cloud here. Initially i would like to give every vm a single VCPU,but can scale up to 8 or more by taking cpu from other vms if they are not using it. Is there any kind of tool that makes vm to scale its resources when demand increases. Is cloudstack and openstack designed for these kind of purpose or is that just a GUI to manage VMs.

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• Cannot Enter Repro Admin Web Interface at Port 5080

  - by aqua

  I have followed the instructions on this website www.rtcquickstart.org to set up my firewall, DNS settings, TLS, and have installed the TURN server and repro proxy as instructed, and have restarted repro. However, I am not able to access the web interface of repro on port 5080, either at localhost:5080 / 127.0.0.1:5080 or at the server's IP address: IPADDRESS:5080 (I have set the server's IP for binding in repro.config). I get the browser error message: 'Unable to connect to server' whenever trying to connect to the web interface via port 5080. I initially had Apache2 installed, which loaded pages correctly at port 80 / address root, and when checked it 'listened' at port 5080 after it was configured in /etc/apache2/ports.conf, however the repro web interface still did not work at port 5080. I have tried uninstalling Apache2 in case that was conflicting with repro's web server, but the problem persists, and testing port 5080 now shows that nothing is 'listening' on port 5080. I have tried reinstalling / purging repro but it has not helped. My router is correctly set to allow all ports; port 5080 is open and forwarding correctly. I can connect to the internet and ping all websites through the server and everything else is working correctly. I would be gateful if anyone could offer advice on how to solve this problem.

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• Why isn't 'ether proto \ip host host' a legal tcpdump expression?

  - by Ezequiel Garzon

  In its description of valid tcpdump expressions, the pcap-filter man pages state: The filter expression consists of one or more primitives. Primitives usually consist of an id (name or number) preceded by one or more qualifiers. In turn, these qualifiers are type, dir and proto. So far so good, but further down we find this: ip host host which is equivalent to: ether proto \ip and host host In the first case, ip and host are, respectively, proto and type. What pattern does ether proto \ip follow? Isn't that, as a whole, a proto qualifier? If so, why isn't (a properly escaped) 'ether proto \ip host host' legal (no and)?

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• Getting kernel errors when manually mounting VirtualBox shared folders

  - by Ross

  Updated: I've rephrased this problem as I understand it a bit more now (and have encountered another problem). I'm using a Fedora 15 guest on a Windows 7 host using VirtualBox. I am trying to mount a partition on the host PC as a shared folder for use in the guest. The folder appears in /media and is accessible when I use the auto-mount feature when setting up the shared folder, but when I attempt to mount without auto-mount I get the following error: $ sudo mount.vboxsf data /mnt/host_data /sbin/mount.vboxsf: Could not add an entry to the mount table.: Invalid argument In addition a popup appears (part of Fedora/GNOME) reporting a crash in the kernel package: WARNING: at lib/list_debug.c:26 __list_add+0x3e/0x81() However the shared folder seems to work, I can certainly browse it (although everything seems to be executable, probably down to a Windows host). Is there something wrong with what I'm doing or is this a bug (and in which case should it be reported to the Linux Kernel team or VirtualBox)?

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• TDD: Write a separate test for object initialization or relying on other tests exercising it

  - by DXM

  This seems to be the common pattern that's emerging in some of the tests I've worked on lately. We have a class, and quite often this is legacy code whose design can't be easily altered, which has a bunch of member variables. There's some kind of "Initialize" or "Load" function which would put an object into a valid state. Only after it is initialized/loaded, are the members in the proper state so that other methods can be exercised. So when we start writing tests, first test is "TestLoad" and all we put in there is exercising initialization logic. Then we might add one (or few) TestLoadFailureXXX tests and those are definitely valuable. Then we start writing tests to verify other behaviors but all of them require the object to be loaded. So they all start by running exactly the same code as "TestLoad". So my question: Is TestLoad even necessary? Do you take it and let other tests simply exercise the loading? Or leave it so things are more explicit? I know that each unit test function should have no (or as little as possible) overlap with other test functions, but it seems like in cases of loading, this is unavoidable. And whether we like it or not, if something in the loading code breaks, we will end up with a whole test suite of failures. Is there another approach that I might be missing here? Thank you for the responses. It definitely makes sense that you want to see "InitializationTest" and if that fails you know where to start looking. In case it matters, this question is mostly about C++ and we use CppUnit framework. And now, thanks to sleske, I'll be constantly wishing that CppUnit supported test dependencies. Might have to hack something in one of these days :)

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• Office arangement - comfort vs. teamwork?

  - by finrod

  Our team works in an open-space office. Luckily the cubicles are quite big (L shaped tables for everyone!), there is quite a lot of space so we are not sandwiched. Without going into further detail, there are comfortable spots (window), normal spots and stupid spots (near the corridor). Until recently, the development team of twelve engineers was seated so that all types of spots were occupied and we were all close together. In the old arrangement, verbal communication was very easy - half of the team was withing talking distance. The other half was like ten steps away. Often times I could ask, discuss, solve problems without leaving the cube. Most of the communication is work related, no bullshit or mental masturbation that would unnecessarily distract others. Now we have moved to another part of the building and have larger space to occupy. At this point, everyone could pick their spot. Naturally all stupid spots are left empty (for the poor newcomers to occupy bwehaha). In the new arrangement, the development team is stretched across the floor and some of the key engineers are seated 'far' from each other - definitely not within talking distance. I have yet to experience how this works out but am getting concerned that team work and communication may have been traded for personal comfort. Finally the questions... What do you think is better office arrangement? Such that allows for free verbal communication but trading for some developer's comfort, or such that potentially hinders verbal communication but makes developer's more comfortable in their spot? Or maybe it does not matter at all and we will evolve to be efficient in any arrangement? What is your personal experience? Note - yes I read books and posts how workplace is important in our job. However in this case - we are all still in open space and the difference between the different spots are not really groundbreaking. So I'm thinking the little comfort that few developers gain is not worth the loss of easy communication.

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• relationship between the model and the renderer

  - by acrilige

  I tried to build a simple graphics engine, and faced with this problems: i have a list of models that i need to draw, and object (renderer) that implements IRenderer interface with method DrawObject(Object* obj). Implementation of renderer depends on using graphics library (opengl/directx). 1st question: model should not know nothing about renderer implementation, but in this case where can i hold (cache) information that depends on renderer implementation? For example, if model have this definition: class Model { public: Model(); Vertex* GetVertices() const; private: Vertex* m_vertices; }; what is the best way to cache, for example, vertex buffer of this model for dx11? Hold it in renderer object? 2nd question: what is the best way for model to say renderer HOW it must be rendered (for example with texture, bump mapping, or may be just in one color). I thought it can be done with flags, like this: model-SetRenderOptions(RENDER_TEXTURE | RENDER_BUMPMAPPING | RENDER_LIGHTING); and in Renderer::DrawModel method check for each flag. But looks like it will become uncomfortable with the options count growth...

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• Missing management console for Symantec Antivirus, Corporate Edition

  - by Alex C.

  I work for a small (80 employees) non-profit organization. We have a Windows network with a domain. The file server is running Server 2003. A vendor recently installed Symantec Antivirus, Corporate Edition, ver. 10.1.8.8000. It used to be the case that when I logged in to the file server as administrator, I would see an icon on the desktop that took me to the management console for the antivirus software. I could check logs, statuses of client machines, set policies, etc. That icon is now missing, and I can't find anything relevant under the "Start" menu. There is an entry for Symantec Antivirus, but that only gives me the panel for the client process, not the overall management console for the whole network. I don't want to call the vendor back to fix this (I'm baffled how we lost the icon in the first place). Can someone offer some guidance?

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• How do I require use of the 5 GHz band when connecting to a Wireless N access point?

  - by cqcallaw

  What is says in the topic: there's a Wireless N access point to which I'd like to connect using the 5 GHz band exclusively. How does one accomplish this? Using the directive band=a in the connection configuration file in /etc/NetworkManager/system-connections doesn't seem to affect anything (/var/log/syslog still shows attempts by wpa_supplicant to connect using the 2.4 GHz band), and running iwconfig wlan0 freq 5G per this question results in the following error: Error for wireless request "Set Frequency" (8B04) : SET failed on device wlan0 ; Invalid argument. [Edit] I'm hoping the answer won't depend on the hardware in use, but here's some information about the hardware, just in case: System is an Asus ZenBook Prime UX31A-DB51, running Ubuntu 12.04. lspci output: 00:00.0 Host bridge: Intel Corporation Ivy Bridge DRAM Controller (rev 09) 00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09) 00:04.0 Signal processing controller: Intel Corporation Device 0153 (rev 09) 00:14.0 USB controller: Intel Corporation Panther Point USB xHCI Host Controller (rev 04) 00:16.0 Communication controller: Intel Corporation Panther Point MEI Controller #1 (rev 04) 00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #2 (rev 04) 00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio Controller (rev 04) 00:1c.0 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 1 (rev c4) 00:1c.1 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 2 (rev c4) 00:1d.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #1 (rev 04) 00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04) 00:1f.2 SATA controller: Intel Corporation Panther Point 6 port SATA Controller [AHCI mode] (rev 04) 00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04) 00:1f.6 Signal processing controller: Intel Corporation Panther Point Thermal Management Controller (rev 04) 02:00.0 Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 24) The driver for the wireless interface is iwlwifi.

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• Permissionless external drive with NTFS

  - by user12889

  I have an external hard disk which has 1 partition, formatted in NTFS. I use this drive on multiple computers with a different logins on different machines, Windows XP and Windows 7. All files are plain old files, not OS encrypted or compressed. Every now and then Windows 7 does not let me access some files, citing permission problems. I can circumvent this per case by taking ownership and setting appropriate permissions. This, however, is tedious. Is there a simple way to tell Windows to not enforce or store any permissions on any file/directory on a partition?

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• CLI-Based monitoring tool for KVM

  - by Pinnacle

  I am developing a scheduler for running VMs on KVM. The scheduling has over-commitment of resources like memory and CPU. For this, I need a CLI-based monitoring tool that keeps me giving information about the resource usage of each VM, because it might be the case that due to over-provisioning of resources, VMs on a particular host are running very slowly depending on the benchmarks/programs each VM is running, and then I need to migrate a VM to another host and so on. I looked into libvirt-based tools like collects, MUNIN, Nagios-vert, etc.( http://libvirt.org/apps.html#monitoring ) I also looked into Ubuntu utility perf-kvm ( http://manpages.ubuntu.com/manpages/maverick/man1/perf-kvm.1.html ) I want to ask which CLI-based would be recommended by the community so that I can make a automated scheduler that takes care of the above situation.

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• does windows incremental backup include system state backup?

  - by Kossel

  I'm managing my very small office server with windows server 2008. since I have only one server, and the user group is really small. I made the first hdd into 2 partitions. one (C:) for windows and Active directory, another (D:) for tomcat and database. I'm doing incremental back C: and D: daily to hdd2 (E:) using windows server backup. is it enough to let me do fully restore my server in case of disaster? I ask this because I have read there is also a system state backup, and I also have to do that periodically in order to get AD back? isn't it with incremental/full backup I can do full bare-metal recovery?

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• How bad it's have two methods with the same name but differents signatures in two classes?

  - by Super User

  I have a design problem relationated with the public interface, the names of methods and the understanding of my API and my code. I have two classes like this: class A: ... function collision(self): .... ... class B: .... function _collision(self, another_object, l, r, t, b): .... The first class have one public method named collision and the second have one private method called _collision. The two methods differs in arguments type and number. In the API _m method is private. For the example let's say that the _collision method checks if the object is colliding with another_ object with certain conditions l, r, t, b (for example, collide the left side, the right side, etc) and returns true or false according to the case. The collision method, on the other hand, resolves all the collisions of the object with other objects. The two methods have the same name because I think is better avoid overload the design with different names for methods who do almost the same think, but in distinct contexts and classes. This is clear enough to the reader or I should change the method's name?

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• User accounts in FTP

  - by Brad

  I have an FTP server(proftpd on debian) that I'm going to allow a couple friends access to, and I want some safety nets in place, just in case. These are some of the things I'd like to do: Jail the accounts to their home directories and impose a cap on the amount of data they can upload Allow them access to a shared folder(via symlink or something) where they have full access(Also with a storage cap, but larger) Allow my own account full access to the system(Using groups I guess) Not allow anonymous access, or allow it with its own folder, separate from the shared user folder Currently, I've got the accounts set up and jailed, but it seems like the symlink that I put in is not allowing them to visit the shared folder. I suppose this has to do with them not having read permissions anywhere but their own home directories, or maybe it's something else, I'll continue to look into it and provide any information that is requested. Is what I'm trying to do possible? Any tips or resources that you can share are appreciated. Thanks.

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