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  • Advantages of compilers for functional languages over compilers for imperative languages

    - by Onorio Catenacci
    As a follow up to this question What are the advantages of built-in immutability of F# over C#?--am I correct in assuming that the F# compiler can make certain optimizations knowing that it's dealing with largely immutable code? I mean even if a developer writes "Functional C#" the compiler wouldn't know all of the immutability that the developer had tried to code in so that it couldn't make the same optimizations, right? In general would the compiler of a functional language be able to make optimizations that would not be possible with an imperative language--even one written with as much immutability as possible?

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  • IIS6 Virtual Directory 500 Error on Remote Share

    - by David
    We have our servers at the server farm in a domain. Let's call it LIVE. Our developer computers live in a completely separate corporate domain, miles and miles away. Let's call it CORP. We have a large central storage unit (unix) that houses images and other media needed by many webservers in the server farm. The IIS application pools run as (let's say) LIVE\MediaUser and use those credentials to connect to a central storage share as a virtual directory, retrieve the images, and serve them as if they were local on each server. The problem is in development. On my development machine. I log in as CORP\MyName. My IIS 6 application pool runs as Network Service. I can't run it as a user from the LIVE domain because my machine isn't (and can not be) joined to that domain. I try to create a virtual directory, point it to the same network directory, click Connect As, uncheck the "Always use the authenticated user's credentials when validating access to the network directory" checkbox so that I can enter the login info, enter the credentails for LIVE\MediaUser, click OK, verify the password, etc. This doesn't work. I get "HTTP Error 500 - Internal server error" from IIS. The IIS log file reports sc-status = 500, sc-substatus = 16, and sc-win32-status = 1326. The documentation says this means "UNC authorization credentials are incorrect" and the Win32 status means "Logon failure: unknown user name or bad password." This would be all and good if it were anywhere close to accurate. I double- and trouble-checked it. Tried multiple known good logins. The IIS manager allows me to view the file tree in its window, it's only the browser that kicks me out. I even tried going to the virtual directory's Directory Security tab, and under Authentication and Access Control, I tried using the same LIVE domain username for the anonymous access credential. No luck. I'm not trying to run any ASP, ASP.NET, or other dynamic anything out of the virtual directory. I just want IIS to be able to load static images, css, and js files. If anyone has some bright ideas I would be most appreciative!

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  • Time Machine (OSX) doesn't back up files in Mount Point or Disk Image File

    - by Chris
    Hi all, I found this Q&A (http://superuser.com/questions/148849/backup-mounted-drive-of-an-image-in-time-machine) and this prompted me to ask the following question: I have two disk images which are scripted to be mounted on login. These two disk images are always mounted to the same location. These two disk images are encrypted TrueCrypt volumes. Time Machine (TM) will only back up the disk images the first time they are mounted, but not after that. As I modify documents within the volumes throughout the day, the modified timestamps are adjusted properly. However, TM does not back them up. TM never backs up the mount points which are two folders within my home directory. Any ideas as to why neither the mount point or the image files are backed up? Do the image files have to be closed (unmounted) after being modified for TM to back them up? Thanks, Chris

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  • virtual appliance resources

    - by user11457
    I'm fairly new to appliances but have become a big fan of virtualization. Are there any other resources where I can find and download virtual appliances outside of vmware's website? Or do I just need to scour the web looking them? I'm sure there is a central site that lists all the virtual appliances available, if there isn't I'm going to write one.

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  • OSX Time Machine: deletion of backup folders

    - by jml
    I saw this question and was hoping that someone could expand upon the chosen answer (which I understood): Can you sudo mv Time Machine backup files as sudo from the trash to their original locations? I have tried doing this as root to no avail (operation not permitted). If not, can you successfully rm them via the trash via the terminal, faster than what the endless 'preparing to empty the trash' dialog suggests, and If you get the files back out of the trash can you tell if they are intact via disk utility (and how) Can you force indexing on a Time Machine drive in the same way that you would a normal drive to rebuild the TM index? I realize that a single answer could clarify all of the above, but I wanted to include details to be clear on what I am asking. Thanks for any help.

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  • How to activate Virtual Desktop on Fortigate 100A ?

    - by Deniz
    We did recently update the firmware on our Fortigate 100A box and after the upgrade we tried to use the "Virtual Desktop" feature. (This isn't a new firmware feature) We can't find a way to activate or use it. Does anyone have any experience on "Virtual Desktop" of Fortigate devices ?

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  • "Error: Unknown error" when trying to start virtual machine from VMware server

    - by slhck
    Problem We are running VMware Server 2.0.0 build-116503 on a Ubuntu 10.04 LTS server. There is a virtual machine installed, running Lotus Domino on Windows Server 2003. Ever since a sudden power failure last week, the virtual machine won't properly start up. When I run the command: vmrun -T server -h https://127.0.0.1:8333/sdk -u root -p jk2x2208 start "[standard] lotus/test.vmx" … after 30 seconds it displays: Error: Unknown error That's about everything I get. I know the command is right, since that's what we've used all the time. This has happened last Saturday after a scheduled backup shutdown, and somehow I was able to start it again. This week, it happened again, and I can't get it back up. Occasionally, I also get: Error: Cannot connect to the virtual machine When I get this, and I run the start command, it seemingly works. Why is this so random? Which configuration could have been messed up? What I've tried / other info I already shut down VMware itself with /etc/init.d/vmware stop. This works. I tried to start VMware again with /etc/init.d/vmware start. It complains that it's "not configured", which is why I had to rm /etc/vmware/not_configured, and then try to start again. There have been no software updates on the machine, and no configuration changes

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  • IIS6 Virtual Directory 500 Error on Remote Share

    - by David Boike
    We have our servers at the server farm in a domain. Let's call it LIVE. Our developer computers live in a completely separate corporate domain, miles and miles away. Let's call it CORP. We have a large central storage unit (unix) that houses images and other media needed by many webservers in the server farm. The IIS application pools run as (let's say) LIVE\MediaUser and use those credentials to connect to a central storage share as a virtual directory, retrieve the images, and serve them as if they were local on each server. The problem is in development. On my development machine. I log in as CORP\MyName. My IIS 6 application pool runs as Network Service. I can't run it as a user from the LIVE domain because my machine isn't (and can not be) joined to that domain. I try to create a virtual directory, point it to the same network directory, click Connect As, uncheck the "Always use the authenticated user's credentials when validating access to the network directory" checkbox so that I can enter the login info, enter the credentails for LIVE\MediaUser, click OK, verify the password, etc. This doesn't work. I get "HTTP Error 500 - Internal server error" from IIS. The IIS log file reports sc-status = 500, sc-substatus = 16, and sc-win32-status = 1326. The documentation says this means "UNC authorization credentials are incorrect" and the Win32 status means "Logon failure: unknown user name or bad password." This would be all and good if it were anywhere close to accurate. I double- and trouble-checked it. Tried multiple known good logins. The IIS manager allows me to view the file tree in its window, it's only the browser that kicks me out. I even tried going to the virtual directory's Directory Security tab, and under Authentication and Access Control, I tried using the same LIVE domain username for the anonymous access credential. No luck. I'm not trying to run any ASP, ASP.NET, or other dynamic anything out of the virtual directory. I just want IIS to be able to load static images, css, and js files. If anyone has some bright ideas I would be most appreciative!

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  • Virtual Function Implementation

    - by Gokul
    Hi, I have kept hearing this statement. Switch..Case is Evil for code maintenance, but it provides better performance(since compiler can inline stuffs etc..). Virtual functions are very good for code maintenance, but they incur a performance penalty of two pointer indirections. Say i have a base class with 2 subclasses(X and Y) and one virtual function, so there will be two virtual tables. The object has a pointer, based on which it will choose a virtual table. So for the compiler, it is more like switch( object's function ptr ) { case 0x....: X->call(); break; case 0x....: Y->call(); }; So why should virtual function cost more, if it can get implemented this way, as the compiler can do the same in-lining and other stuff here. Or explain me, why is it decided not to implement the virtual function execution in this way? Thanks, Gokul.

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  • Is it possible to add an existing Azure VM to an Azure Virtual Network?

    - by Dan Harris
    Didn't think this was directly related to programming, so thought Superuser would be better than Stack Overflow.... Is it possible to add an existing Azure VM to an Azure Virtual Network if you didn't add it to the virtual network at the time of creation? I can't see an option to change which Virtual Network the VM is connected to. Do you just have to do it at the time you create the VM, and if you don't do it then you will need to re-create the VM and delete the existing one? Example of the scenario: No VM's or Virtual Networks exist I create a VM (VM1), there is no virtual network so it isn't added to one Later I create a Virtual Network in Azure (Network1) It is possible to create another VM (VM2) and connect it to the Virtual Network (Network1), but can I connect VM1 to Network1 or must I delete VM1 and re-create it to get it connected to Network1?

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  • Mac OS X Server mobile account VS Time Machine Network Backup

    - by elhombre
    I am installing a Server @home to manage the mac client's of my family. First I wanted to make time machine Backups over the internal network to an external Hard-drive which is connected to my Mac OS X Server (10.6) but when I read about the mobile accounts and it's synchronization features I got a little bit irritated what the differences between the two Services are. So where are the differences between a mobile account and a Time Machine Backup which is made over the network? Can the synchronized mobile Account be backup to an external Harddisk, if yes, how?

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  • Two dimensional virtual desktop space in Ubuntu

    - by Herms
    Is there any way to create a 2-dimensional virtual desktop space in Ubuntu? The only control I'm seeing is the number of virtual desktops, but they seem to only go in a line. I'm used to having a 2-dimensional space (so I can go up/down/left/right instead of just left/right), and I'd really like to have that in ubuntu as well.

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  • How to restore one contact from Address Book with Time Machine

    - by doekman
    I want to restore one contact from my Address Book with Time Machine. To do so, I select the contact in Address Book. Then, I press the Time Machine icon in the dock. Then my address book is "taken into space". However, when I browse back in time (either pressing the arrow back, or selecting a time on the right), the contact details do not change. And I am sure the data has been changed between dates. Also, when I do press restore, it's still the new data, not the backup. Is this a bug, or am I doing something wrong? I'm using OS X 10.6.3 in combination with a external USB drive on an iMac.

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  • Deleting Time Machine in Mac OS X 10.6.4

    - by cappuccino
    Does anyone know how to delete Time Machine in Mac OS X 10.6.4? Before answering: sudo rm -rf /whateverthetimemachineis does not work Disabling the ACL permissions first with sudo fsaclctl -p /whatever -d does not work, sudo: fsaclctl: command not found Use the delete all backup feature in Time Machine... this is slow as hell, would take days. Need a command line solution. No I don't want to reformat the drive, I have other content on it, and no don't say I should have separated on two partition or two drives, I did it this say since partitions cannot be dynamically changed, and two drives is annoying since, whats the point of having a big drive?... plus has no relation to the issue at hand. Already googlied for hours and read everything on Super User, nothing working. and all solutions are the first 4. Any clues?

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  • What problems can arise from emulating concepts from another languages?

    - by Vandell
    I've read many times on the web that if your language doesn't support some concept, for example, object orientation, or maybe function calls, and it's considered a good practice in this other context, you should do it. The only problem I can see now is that other programmers may find your code too different than the usual, making it hard for them to program. What other problems do you think may arise from this?

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  • What is the right option of programming languages and tools for building our website?

    - by Goma
    We are 3 persons trying to build a large website which will be available in 3 languges. However, we will start with one language and with small idea then we are going to improve it and make it larger! What do you think the best tools and language that we should use? We are caring alot about the speed of loading the pages and tools that provide excellent qulaity with cheaper fees. Edit: We are graphic designers, so we did not choose the programming language yet. But we studied computer science and we have an idea but we found that this is the best place to ask the question and expect the right answer from you. Should we use ASP.NET for example? or PHP? We do not want an expesive option that will cost us alot in the future and we do not want to change the technology at least for the first 5 years. Thanks!

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  • What operating systems are used in airplanes, and what programming languages are they developed in?

    - by adhg
    I was wondering if anyone knows what is the operating system used in commercial airplanes (say Boeing or Airbus). Also, what is the (preferred) real-time programing language? I heard that Ada is used in Boeing, so my question is - why Ada? what are the criteria the Boeing-guys had to choose this language? (I guess Java wouldn't be a great choice if the exactly in lift off the garbage collector wakes up).

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  • What are some non-MS languages that can write xlsx (Excel 2007+) documents efficiently?

    - by Honus Wagner
    Unfortunately, Excel format is required for the project I am working on. I have no problems getting the data I need in objects and arrays, and currently PHPExcel is doing handling the document generation. It works, but it's slow and loopy. Was wondering if there is a more efficient server language to generate Excel documents (not CSVs). This is a pure Linux environment so I need to stay away from .NET. I am open to any programming language that does it cleanly and efficiently. Thanks.

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  • Verifying Time Machine backups

    - by jtimberman
    I'm preparing my system for a Snow Leopard upgrade, and I prepare for the worst case scenario: full reinstall and restore. I would like to verify that my Time Machine backups are valid, and will restore correctly. My Time Machine backups go to a Linux server running Netatalk, and the backups complete successfully. How do I do a test restore to an alternative location, or otherwise verify my data without overwriting any existing files? Do I need to save anything in particular externally to make sure I can access the backups if I have to reinstall from scratch?

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  • Deleting Time Machine in Mac OS X 10.6.4

    - by cappuccino
    Does anyone know how to delete Time Machine in Mac OS X 10.6.4? Before answering: sudo rm -rf /whateverthetimemachineis does not work Disabling the ACL permissions first with sudo fsaclctl -p /whatever -d does not work, sudo: fsaclctl: command not found Use the delete all backup feature in Time Machine... this is slow as hell, would take days. Need a command line solution. No I don't want to reformat the drive, I have other content on it, and no don't say I should have separated on two partition or two drives, I did it this say since partitions cannot be dynamically changed, and two drives is annoying since, whats the point of having a big drive?... plus has no relation to the issue at hand. Already googlied for hours and read everything on Super User, nothing working. and all solutions are the first 4. Any clues?

    Read the article

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