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• What character to separate words in filenames? Dashes? Periods? Underscores?

  - by Christopher Albon

  This question isn't about a specific programming language, but more about general best practices. What characters are best (greatest compatibility over programming languages, OSs, file systems, etc.) to separate words in filenames? For example: file.name.txt file_name.txt file-name.txt FileName.txt filename.txt

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• HVM virtualization with PV drivers on XenServer

  - by Nathan

  Is it possible to create an HVM guest in XenServer 5.5 that uses PV drivers for disk and network without being fully paravirutalized? This should give me decent performance from the VM without having to jump through hoops to create a PV guest when a pre-built template doesn't exist. Since PV drivers exist for Windows, and XenServer provides templates for windows that use HVM virtualization this must be possible, I just don't see how to configure this myself.

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• Windows 7 boot manager editor as an option in boot manager

  - by Tomek

  Is there any boot manager editor that I can run in DOS (possibly) before the system will load and edit boot manager itself? I would like to delete, edit VHD's and other files, copying them from the network, changing the names and adding to the manager)? Are there any other boot managers that I can use to boot up Windows 7 and 2008 from VHD file? I would like to have flexibility similar to virtualization w/o performance hit and ability to use all 4 processors on the server (using Windows HPC Server).

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• Does luks ecryption effect TRIM? (SSD and linux)

  - by data_jepp

  I'm moving over to linux when the new SSD arrives. SSD gives increased performance, so I thought that I could encrypt everything. But then I came to think about TRIM, and garbage collection on the drive. Will luks encrypted drive effect the garbage collection system? (trim).

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• Cheat Sheets for System Administrators?

  - by splattne

  I'd like to start a collection of good, free cheat sheet resources for system administrators. Please add your favorite ones. From the Wikipedia "cheat sheet" article: In more general usage, a "cheat sheet" is any short (one or two page) reference to terms, commands, or symbols where the user is expected to understand the use of such terms etc but not necessarily to have memorized all of them.

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• There are lots of "Core i" CPUs, but Dell only offers a few -- who builds systems with the others? [closed]

  - by Jesse

  Passmark shows many varieties of Core i3, i5, and i7 cpus. Some of them, even at similar prices, are much faster than others. But Dell only offers a few options, and they're not the fast ones. For example, Dell offers the Core i5 650 (benchmark), which costs $220, and doesn't come close to the performance of the Core i3-2100 (benchmark), which costs $120. Does anyone sell systems with the faster, cheaper chips?

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• Free-as-in-beer binary file format inspector

  - by fbrereto

  I am looking for a utility that gives me the ability to specify a binary file format and then interpret a file of bytes according to that format. (Something along the lines of the 010 Editor, but infinitely more cost-effective). Something that runs on Mac OS X would be preferred, but I'm interested to see what all is out there in general (while more of a hassle I'd be willing to run a tool on Windows if it were superior.) What's your preference?

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• Should my web server add trailing slashes to URLs or remove them?

  - by jnm2

  I've read in several places that you should decide whether you want trailing slashes or no trailing slashes in your site URLs and stick to your choice consistently. This makes sense, but which should I pick? Is there a convention I ought to follow, performance to be gained, or is it totally up to my taste? (I notice that the StackExchange sites link without trailing slashes, but SE doesn't redirect if you add a slash.)

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• IIS Express only utilizes 13% of i7 Quad Core

  - by John Nevermore

  Since one of my scripts got incredibly complex, i was benchmarking the performance of moving some javascript processing logic to the server side in my ASP.NET MVC 4 application. According to taskmgr.exe, IIS Express only utilizes 13% of my i7. I decided to throw in 3 parallel tasks calculating the fibonacci sequence up to 50 and the IIS express still wouldn't utilize more than 13% of my cpu. Is there anything i can do, so that the application utilizes the full cpu, as it would in a real server ?

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• Virtual Box state not saving upon restart/reset/shutdown - reverting to an earlier state

  - by user638756

  Every time I restart/shut down my VM in VirtualBox (image is Ubuntu 10.02), whenever I start it back up, it reverts to the state it was in after I installed Guest Additions. This is extremely frustrating as every time I make progress on a project, whenever it restarts (mostly from crashing), I have to redo mostly everything. Is this a known problem with Guest Additions or with Virtual Box in general, and if so is there some solution?

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• Some Windows AD user property cannot be changed by AD user himself, what controls it?

  - by Jimm Chen

  I'm curious with a question I find. An Windows Active Directory user can change his own telephone number, street address etc, but can NOT change his own email-address registered on the AD. Using Python+pywin32 I can also verify this behavior. When trying to change own EmailAddress, I got error General access denied error . I'd like to know where in the AD this allow/deny behavior is defined. Thank you.

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• Tomcat - Spring Framework - MySQL, Load balancing design

  - by Mat Banik

  Lets say I have Spring Framework App that is running on Tomcat and uses MySQL database: What would be the best solution in this instance that would allow for sociability (price/performance/integration time)? More precisely: What would be on the Web Load balancer box, and who should be the tomcat web server clustered? What would be on the Database Load balancer box and how should be the database servers clustered? And if at all possible specific technical integration links would be of great help.

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• x86 vs x64 windows7 on an i7 processor

  - by joseph g

  I have a laptop with a new i7 Q720 processor that currently runs Windows-7 32 bit. With the exception of limiting my RAM to 4gb, are there any other ways that the 32bit OS is hindering my laptop performance?

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• What are the functionalities of Distributed File systems and Distributed Storage Systems?

  - by Berkay

  i'm reading cloud vendors solutions for the distributed storage systems such as Amazon Dynamo and Google Big Table. and really confused in two terms : what is Distrubuted file systems for in cloud ? what is Distributed storage systems for? what are differences of these terms and functionalities ? if i understand these terms i will create the general architecture of the cloud vendors, any good tutorial or web page will be appreciated. Thanks

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• Cat5 vs Cat5e vs Cat6 cable confusion

  - by David Hayes

  I'm just about to move house so I'm going to have to disconnect and re-wire my network. Pretty much all the devices I have support gigabit ethernet should I go out an buy some decent network cables (and if so what type) or should I continue using my mix of cat5 cables I've acquired over the years. Does the type of cable really make a difference to my LAN performance??

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• What does the filesystem give me?

  - by Alec

  I'm writing a specialised database. It currently sits atop of ext4, with one big file that it reads and writes to. I'm wondering whether it would be worth forgoing the filesystem and reading and writing directly to the device. I already use O_DIRECT, so as far as I can tell it wouldn't require much of a code change. What might the risks, advantages and disadvantages of forgoing the filesystem be? Is it likely to improve performance, or harm it?

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• Is bigger capacity ram faster then smaller capacity ram for same clock and CL?

  - by didibus

  I know that bigger capacity hard-drives with the same RPM are faster then smaller capacity hard-drives. I was wondering if the same is true for ram. Given two ram clocked at 1600mhz and with identical CLs: 9-9-9-24. Is a 2x8 going to perform better then a 2x4 ? Note that I am not asking if having more ram will improve the performance of my PC, I'm asking if the bigger capacity ram performs better. Thank You.

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• Migration from XP to Windows 7 using recovered HD

  - by KenK

  Is it possible to migrate the Windows XP Pro 32 bit operating system, applications etc from a USB external drive which is the recovered hard drive from that failed system to my new desktop computer with Windows7 64 bit system? In doing so, I would like to set up the new computer with the OS and all general applications on the primary 1TB hard drive while the secondary 1TB hard drive to have nothing else but graphics programs and gaming applications complete with their related files and add-ons. What will I need to accomplish this task efficiently and economically?

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• HP Colour LaserJet Printer Hard Drive

  - by Jon Rhoades

  We are struggling to print Student's Theses on our HP CLJ CP4025 Printers (It will only let us print 1 at a time & typically they need multiple copies). Supposedly the solution is to install the optional Hard Drive. My question is: a) Does a hard drive on the printer make a significant difference? b) Can we use any old hard drive or do we have to use the rather pricey HP High performance EIO units?

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• RabbitMQ and persistence (blocking writes?)

  - by daharon

  I want to create a RabbitMQ server on a virtual machine (VMware) to be used in production. It will contain persistent queues. I'm wondering if it is a bad idea to store the server on a NAS that's accessed over NFS. Basically my questions are: Will RabbitMQ's writes be blocking? Will the entire queue's operation halt on a write? How much performance degradation should I expect when persisting over NFS?

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• CentOS with an Ubuntu kernel

  - by Gaia

  The Rackspace cloud server tech tells my CentOS 5.4 VPS (Xen) runs "CentOS with an Ubuntu kernel" Could someone explain, in plain terms, what "CentOS with an Ubuntu kernel" means and if there are any disadvantages (performance, mgmt) between that and running CentOS with a CentOS kernel? Thanks

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• Should I keep my swap file on an SSD drive?

  - by Steve Rowe

  I'm considering getting an SSD drive to run as the primary OS partition. As I understand, this should provide a substantial improvement in performance. My question is this: Should I leave the swap file on that drive? The swap partition will be largely random seeks and so should benefit from the speed. On the other hand, it will be constantly written to which will wear out the drive faster.

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• Application to test a cluster/grid

  - by Mystic

  Is anyone aware of any application (computation + data) that I can download to test an in-house grid middleware that will run on a local cluster. I hope to compare the performance with other available grid systems.

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• Hi do I diagnose the bottleneck in mt Intel Atom based Ubuntu server?

  - by Jon Cage

  I have a small media server at home which has software raid and a gigabit link to the rest of my network. For some reason though, I only get ~10MB/s transfers when copying to/from the server. How can I benchmark network throughput (Windows 7 desktop <- Ubuntu server) and hard disk performance to try and identify where my bottleneck might be?

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• Windows server 2008 R2 error :The page file is to small to complete the action

  - by kishore

  I have a windows server 2008 R2 standard edition. The system suddenly stopped accepting remote desktop connections. When I tried to connect directly to the console, I am unable to start any applications. I got errors "The page file is to small to complete the action". Under takmanager in performance the system shows "Commit(GB) 127/127". What does this imply? The system has 32 GB ram, 5 raid disks each 150 Gb

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