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  • Can you easily turn your settings into an Operating System?

    - by PyRulez
    I know that there are ways to make your own operating system (otherwise, there would be none) but require programming skill. (I am only a hobbyist programmer, couldn't do an Operating System.) Is there any programs that can take your current operating system, with all of its settings, tweaks, and applications, and make a new ISO, or other image file, that when installed, comes with all those custom settings, tweaks, and applications?

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  • Issues with time slicing

    - by user12331
    I was trying to see the effect of time slicing. And how it can consume significant amount of time. Actually, I was trying to divide a certain work into number of threads and see the effect. I have a two core processor. So two threads can run in parallel. I was trying to see if I have a work w that is done by 2 threads, and if I have the same work done by t threads with each thread doing w/t of the work. How much does time slicing play a role in it As time slicing is time consuming process, I was expecting that when I do the same work using a two thread process or by a t thread process, the amount of time taken by the t thread process will be more Any suggestions?

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  • Low Level Software and Devices

    - by user271619
    I'm looking at a new chapter in my career. I'm a web developer, but now I'm starting to play around with C, compilers, and things I didn't have to work with before. It's all very intriguing! As I'm getting more and more into the "lower level" arena, I'm wondering how devices (mice, printers, webcams, microphones, etc...) are controlled, managed, detected, or used in general with software. I ask because I'm really having a hard time finding straightforward documentation online describing or giving examples of how hardware interacts with software. Does someone know of decent sites that can get me started learning this?

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  • why was tannenbaum wrong?

    - by Robz
    I was recently assigned reading from the Tannenbaum-Torvalds debates in my OS class. In the debates, Tannenbaum makes several predictions: Microkernels are the future x86 will die out and RISC architectures will dominate the market (5 years from then) everyone will be running a free GNU OS I was a 1 year old when the debates happened, so I lack historical intuition. Why have these not panned out? It seems to me that from Tannenbaum's perspective, they're pretty reasonable predictions of the future. What happened so that they didn't come to pass?

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  • Windows 7 disk backup and clone for deployment to multiple systems

    - by gregmac
    I'm in the process of deploying some new PCs (there's only 8), all identical hardware. What I'd like to do is install Windows 7 (64bit), join to domain etc, install a bunch of other software, and then clone that drive to multiple other machines. I'd also like to be able to use it as a backup image, so the machine can be restored back to that image at some future date. I understand this involves at least sysprep, but I am confused after reading some tutorials that talk about using Windows Automated Installation Kit, or hacks with the registry and custom-build batch files. This process seems overly complex to me: I did something similar 10+ years ago, and and don't remember it being this bad. Surely things have improved in a decade? There's also some products that involve having network servers running deployment software, network boot, etc etc.. this is way more than I want to set up. My systems are all identical hardware. Is there a simplified way to clone PCs? Preferably (since I'm a lazy developer, and not an IT admin) I'd like to find some off-the-shelf product that I can run after I get the machine setup, that will spit out a bootable DVD I can run on all the other systems, which will boot up, ask for a computer name, join it to the domain, and that's it. Does such as product exist?

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  • Distributed File Systems.

    - by GruffTech
    So, I've been reading several articles around ServerFault as well as google. (For Example, this link) My Requirements are very similar to the link above, however i'd like to also have dynamic or at least resizeable file volumes, so if necessary i can add 4-5 servers to the pool, and then expand the volume. Any Distributed File systems that support that, to save me some time? Thanks! LustreFS will be my next test cluster to build. GlusterFS I've build a 3-machine test GlusterFS cluster, However i quickly became aware of several of its limitations that it doesn't seem to make clearly public. One, i can't seem to resize a volume. Once a volume is created, its done. Which seems retarded, why have a fully scalable file system if i can't scale a volume? So maybe i'm doing something wrong. I'm not sure. AmazonS3 while gives the cheapest startup adds too much cost when broken down to per client per month, so its out. Building my own system when prorated over several years with no bandwidth costs makes it significantly cheaper. MogileFS isn't an option as we'd like this server to be a SAN-Replacement, for storing tons of media from a multitude of systems, which for us means it needs to be POSIX compliant so it can be remotely mounted via NFS or CIFS.

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  • Recommendation on remote access setup for accessing customer systems

    - by gregmac
    I'm looking for a product recommendation (open or commercial) that will allow remote access to customer sites for tech support purposes. We need to be able to gain access to help troubleshoot problems on servers. Currently end up using anything from RDP on public IP, to various VPNs that clients happen to have, to webex-type sessions that require lots of interaction from both sides to get things working. This often means a problem that could take 10 minutes to solve takes an extra 30+ minutes messing around trying to get a connection up. There are multiple customer sites, which should NOT have access to each other. At each site, there is anywhere from 1 to 8 servers (Windows 2003 or 2008) that need to be accessed. Support connection to machines even if they're behind a firewall/router with no public IP Be able to selectively allow/deny access from customer site. Customer site should not be able to connect outbound to anywhere else (our systems, or other customer sites) Support multiple users from our end If not a VPN connection (where RDP could be used over top), should support: Remote desktop access, including copy/paste File transfers Preferably would have some way to list all remote systems, showing online/offline. Anyone have any suggestions?

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  • Compatiblity of 64 bit systems

    - by Bill
    I am running Windows Vista home premium 32bit on an Intel core2 duo E7300,which I believe is actually a processor capable of running 64bit.I also run Adobe photoshop CS5 which i believe could utilise the 64 bit processor and more ram.Could I change my operating system to 64bit and would I gain anything from doing so.

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  • Wastage of resources in Virtualization

    - by Sabeen Malik
    I have asked this question on SO, but was suggested that i ask it here on SF, so here it goes. http://stackoverflow.com/questions/3010753/wastage-of-resources-in-virtualization I am not sure if this is the right place to ask the question. However i hope it is. When looking for a VPS earlier today, I was trying to understand how each container would work in the background. Keeping in mind the fact that the operating system uses most of the memory and power on a system, wouldn't having multiple operating systems in the same machine mean more wastage of resources. For instance if i was running centOS on a dedicated box and it was running lets say 20 background OS level processes. Then i go and install a virtualization platform and install 5 more centOS virtual machines in the same system which are exactly the same as the host operating system. Doesn't this mean duplication of those 20 processes 6 times? So internally the context switching is happening between 120 processes instead of 20? Further Notes: Here is an example of what i am thinking: I have a master-slave configuration for a long running, cpu + memory intensive process, which can be distributed to 4 machines. Lets say when the process runs on these 4 machines with lets say 1 Gh CPU and 1 Gig RAM, i get 400 results per hour from the cluster (assuming 100 results from one machine) . Now i get a bigger machine ( lets say 4Gh and 4 Gig RAM), have 4 virtual hosts on it with 1 Gz CPU and 1 Gig RAM. Will this configuration give me the same 4 results per hour from these 4 virtual hosts?

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  • How much system and business analysis should a programmer be reasonably expected to do?

    - by Rahul
    In most places I have worked for, there were no formal System or Business Analysts and the programmers were expected to perform both the roles. One had to understand all the subsystems and their interdependencies inside out. Further, one was also supposed to have a thorough knowledge of the business logic of the applications and interact directly with the users to gather requirements, answer their queries etc. In my current job, for ex, I spend about 70% time doing system analysis and only 30% time programming. I consider myself a good programmer but struggle with developing a good understanding of the business rules of a complex application. Often, this creates a handicap because while I can write efficient algorithms and thread-safe code, I lose out to guys who may be average programmers but have a much better understanding of the business processes. So I want to know - How much business and systems knowledge should a programmer have ? - How does one go about getting this knowledge in an immensely complex software system (e.g. trading applications) with several interdependent business processes but poorly documented business rules.

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  • Examples of limitations in IT due to different bit length by design

    - by Alaudo
    I am teaching the course "Introduction in Programming" for the first-year students and would like to find interesting examples where the datatype size in bits, chosen by design, led to certain known restrictions or important values. Here are some examples: Due to the fact that the Bell teleprinter used 7-bit-code (later accepted as ASCII) until now have we often to encode attachments in electronic messages to contain only 7 bit data. Classical limitation of 32-bit address space leads to the 4Gb maximal RAM size available for 32-bit systems and 4Gb maximal file size in FAT32. Do you know some other interesting examples how the choice of the data type (and especially its binary length) influenced the modern IT world. Added after some discussion in comments: I am not going to teach how to overcome limitations. I just want them to know that 1 byte can hold the values from -127..0..+127 o 0..255, 2 bytes cover the range 0..65535 etc by proving examples they know from other sources, like the above-mentioned base64 encoding etc. We are just learning the basic datatypes and I am trying to find a good reference for "how large" these types are.

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  • Moving From IT to Embedded software Developing

    - by Ameer Adel
    i worked for two years at a channel station, managing various Types of tasks, varying from printers installation, software solution, down to managing and maintaining server automation, to be honest, i always been enthusiastic about programming, i studied at some affordable college and finished my IT path successfully, my graduation project was in C# ADO.NET couple of years ago. Obviously it was so much of a beginner spaghetti code than a well furnished code. I also had the chance; after leaving the IT career, to study about some ASP.NET MVC and web apps development. I have rookie level of coding skills due to the poor level of education i endured, and sufficient resources. Currently i m working as a trainee in a newly opened embedded software development company, that is being said, i am, as i sound, have a little idea about the algorithms included, as i was reading for the past couple of days, embedded system development requires more strict coding skills, including memory management, CPU optimization according to its architect, and couple of other tricks regarding the display, and power management if mobile.. etc. My question is, What type of Algorithms am i supposed to use in such cases, as i mentioned before, i am really enthusiastic about learning programming skills and algorithms related to embedded systems and programming languages, including C/C++, Java, C#, and some EC++ if still operational.

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  • What Computing/Programming Qualifications should I aspire for

    - by indevel
    I am a computing science post graduate in my first job from after my degree. During my 12 month review my boss posed the question "What can we do for you in terms of progressing your career?". This got me thinking, after university I hadn't really thought about what other qualifications were available. So this is my question, what courses/qualifications should I be looking to do. Which are highly regarded and which would be really useful to complete. I've searched Google it but all I see is a jumble of courses with no idea of the credibility of each. Any help is much appreciated. I'm traditionally a systems architect, but with this job I've turned to more embedded work so Id like to edge towards electronics, embedded programming, real time OS to help with my work also it would be more likely to be accepted if it was related to my job. Finally UK based courses/ qualifications are a must as travel is probably out of the question. Help me grow as a programmer.

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  • How do I recover from a Linux CentOS 4.6 Operating System Crash

    - by Greg Omebije
    Our x86 Linux server running CentOS4.6 has crashed. The machine boots only to the Grub prompt. We have tried using the "rescue mode" to recover the System, but it hasn't worked. How can we fix this problem, so that the machine boots normally? How can we fix this problem to the point were we can recover our files from the server Our Linux Server Configuration: Dell PowerEdge 1950 Intel Xeon 2 HDD (146GB each) 4GB RAM Hardware and Software raid setup CentOS 4.6 We used Sysrecord to boot the computer: the following are the output of fdisk -l Disk /dev/sda: 293.3 GB, 292326211584 255 heads, 63 sectors/track, 35539 Cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00000080 Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 17769 142625070 8e Linux LVM

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  • Weirdness After Reinstall The Windows Operating System

    - by Eka Anggraini
    I want to ask, and ask advice from you guys. I have reinstall my OS and successful, I'm turn off the restart a few times is fine .. Later a few hours later, when I turn it on, a sudden there was an error : Windows could not start because the following file is missing or corrupt: \WINDOWS\SYSTEM32\CONFIG\SYSTEM You can attempt to repair this file by starting Windows Setup using the original Setup CD-ROM Select 'R' at the first screen to start repair. So I intend to repair, reinstall all again .. I enter cd windows : press any key .. with blue background text below: Setup is loading files (windows executive) Setup is loading files (hardware abstraction layer) Then I was waiting until half an hour, and no changes, I repeated the process several times is also nil. Please advice and solutions about the problem where? Hardware / cd Windows ?

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  • Cache coherence literature for big (>=16CPU) systems

    - by osgx
    Hello What books and articles can you recommend to learn basis of cache coherence problems in big SMP systems (which are NUMA and ccNUMA really) with =16 cpu sockets? Something like SGI Altix architecture analysis may be interesting. What protocols (MOESI, smth else) can scale up well?

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