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  • What's a good starting point to learn about JIT compilers?

    - by davidk01
    I've spent the past few months learning about stack based virtual machines, parsers, compilers, and some elementary things about hardware architecture. I've also written a few parsers and compilers for C like languages to understand the generic parser/compiler pipeline. Now I'd like to take my understanding further by learning about optimizing compilers and JIT compilers but I'm having a hard time finding material at the right level. I don't yet understand enough to dive into a code base like PyPy or LuaJIT but I also know more than what most introductory compiler books have to offer. So what are some good books for an intermediate beginner like to me to look into?

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  • How do I create my own programming language and a compiler for it

    - by Dave
    I am thorough with programming and have come across languages including BASIC, FORTRAN, COBOL, LISP, LOGO, Java, C++, C, MATLAB, Mathematica, Python, Ruby, Perl, Javascript, Assembly and so on. I can't understand how people create programming languages and devise compilers for it. I also couldn't understand how people create OS like Windows, Mac, UNIX, DOS and so on. The other thing that is mysterious to me is how people create libraries like OpenGL, OpenCL, OpenCV, Cocoa, MFC and so on. The last thing I am unable to figure out is how scientists devise an assembly language and an assembler for a microprocessor. I would really like to learn all of these stuff and I am 15 years old. I always wanted to be a computer scientist some one like Babbage, Turing, Shannon, or Dennis Ritchie. I have already read Aho's Compiler Design and Tanenbaum's OS concepts book and they all only discuss concepts and code in a high level. They don't go into the details and nuances and how to devise a compiler or operating system. I want a concrete understanding so that I can create one myself and not just an understanding of what a thread, semaphore, process, or parsing is. I asked my brother about all this. He is a SB student in EECS at MIT and hasn't got a clue of how to actually create all these stuff in the real world. All he knows is just an understanding of Compiler Design and OS concepts like the ones that you guys have mentioned (ie like Thread, Synchronisation, Concurrency, memory management, Lexical Analysis, Intermediate code generation and so on)

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  • Newbie tips, please [closed]

    - by eXeP
    So, I just got a new computer and I want to put Ubuntu on my old laptop. I just need few tips before installing it. 1.Programs, where to download, how to download, what is the "ending" (windows has .exe) 2. How much is command line involved? And where to get the most usual commands? 3.Few programs you recommend (graphics editing, IDE, video player, web browser) 4. Do I have to download drivers when installing new OS? I plan on getting fully rid of Windows. I have no idea of the name of my graphics card, so how do I can get to know what it is if I have to download drivers? (I don't know the name because it's not on the original box, or anywhere on the internet, believe me) 5. When installing new OS does it destroy everything else on the hard drive? 6. Anti-virus, do I need one? I'm not super paranoid, and I don't visit "shady" sites. Please note that I have never used linux, or any other OS than Windows and sorry for my bad english. If this is the wrong place to post this, then please remove this. Thank you.

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  • How to execute a script while booting Linux from flashdrive?

    - by Usman Ajmal
    I know i can make my script run at boot time in runlevel 2 by putting it in /etc/init.d/ and creating a symbolic to it in /etc/rc2.d but thats when Linux is on hard drive. I want to run my script from a flashdrive such that when a user plug in a flashdrive and powers ON the machine, it may start booting from the OS in flash drive and eventually executing my script. How can I achieve such a functionality? I have tried burning OS to flashdrive but I never succeeded in booting OS from flashdrive.

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  • How to create an GUI that communicate with the USB Devices

    - by VINAYAK
    I am doing my Project using win 32 programming.I am just learning about win32 programming and able to create an UI.I want to communicate with an USB Device with that UI.SO,How can i go for that?Is there any predefined functions will be there are we need to create the function for communicating with the OS and get the devices List and got the details about them. My purpose is to , 1.Creating an UI that tells about the Basic information about the device(We want to send a control request to the device to get the descriptors). 2.For that first of all i want to communicate with the OS for device attachment.That will lead to get the information about the device and Enumeration takes place and then only i request the device information through descriptors by using standard Requests. 3.And also i want to create the driver for my device.That will also need to achieve for communicating with OS(Windows). So,can anyone help me about this?How can i achieve this or approach this? Note: I am at the entry level now so anyone give response will be in a detailed format like step by step process would be appreciable.

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  • How to get rid of the orange highlight in Unity?

    - by user74660
    I've installed Ubuntu 12.04 LTS and I'm using Unity. I also installed Adwaita theme and Elementary icons. Everything is cool. Highlightings are blue, as I want them to be, but there are some places where the default orange color remains: When clicking on Workspace Switcher, the borders of the current or the selected workspace are still orange. When dragging a window to the edges of the screen, the highlight effect for the Snap Window feature is still orange as well. All other highlights are blue, according to the Adwaita theme. So, how can I get rid of those two mentioned orange highlights and turn them into blue, following the Adwaita color theme? Thanks for your attention. brunces

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  • Error loading libGL.so.1

    - by jdp407
    When attempting to run various pieces of software (notably Steam and Yenka), I have come across an error similar to this: enter code here error while loading shared libraries: libGL.so.1: cannot open shared object file: No such file or directory I'm running a 64 bit system, with an NVidia Optimus card (I dual boot for certain windows only software that requires a dedicated graphics card). I have bumblebee installed, and I am using the nvidia-current driver, rather that one downloaded from NVidia, as recommended. The library (libGL.so.1) is not present in the top directory of /usr/lib, however it is present in /usr/lib32/nvidia-current, as a softlink to /usr/lib32/nvidia-current/libGL.so.304.64. A section of the output from ldconfig -p: libGL.so.1 (libc6,x86-64, OS ABI: Linux 2.4.20) => /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 libGL.so (libc6,x86-64, OS ABI: Linux 2.4.20) => /usr/lib/x86_64-linux-gnu/libGL.so libGL.so (libc6,x86-64, OS ABI: Linux 2.4.20) => /usr/lib/x86_64-linux-gnu/mesa/libGL.so Obviously a library with that name is being loaded, but they are located in /usr/lib/x86_64-linux-gnu, however installed software doesn't seem to able to 'see' it. For Steam, running it with optirun causes it to work, but this is not the case for Yenka. I assume that optirun causes the library stored in /usr/lib32/nvidia-current to be used, which allows Steam to run, so I can't understant why Yenka won't run. Can anyone explain why software can't see the normal mesa library, and why Yenka refuses to run with the nvidia-current library?

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  • Custom distro using ubuntu 12.04

    - by user89707
    I am creating the custom operating system using the ubuntu 12.04. When ubuntu login from the light dm -- it shows ubuntu desktop . i need to change to the my os name. I need to replace the ambaince dark icon to fs icon by default for all the login and live cd. How to permanentely change the os name It should not change even the customer update the operating system too. I am using the remastersys. I am looking to develop the new distro. like mint ,, If i had an breif explanation of the creation of the repository and maintaining the updates . it will be more helpfull. Kindly provind the link for creating the full fledged os based on the ubuntu .. like mint, Snowlinux, etc did.. replace the grub with burg for default installation If remastersys is not good . then provide me some other tool to create . I am not having the high speed internet

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  • Create new partition on ssd hard (remove hibernate)

    - by Aleks
    I bought Dell Vostro 3360 notebook with Windows 7 It has 128 GB SSD hard disk, it is already has 4 partitions: Dell partition, Recovery partition, OS partition, Hibernate partition. Here is screenshot (Russian language, but I made some marks): I want to split OS partition, because I need c:\ and d:\ . Reason is that I have a lot of difficulties with administration mode on c:. So I tried to split OS partition but I already have 4 partitions. Can I remove hibernate partition without consequences? I have Hibernate disabled in settings, but I have hiberfil.sys file on c:\ If I can remove it, how can I do this, I can't do this with standard GUI disk managment tool

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  • GeForce8800 ultra

    - by Gunnar
    I have been running Ubuntu 10.04 with GeForce 8800 Ultra graphics card without any problems for many months until a few days ago, after some updates, everything stopped working. Can't use Stellarium (my favorite program) and everything (even the mousecusor) stops responding for a long time. Takes ages to load the desktop and everything is just "f..." B.t.w. I have a dual boot and WinXP is not having this problem with the 8800 card. So, elementary... What's going on between Ubuntu and Nvidia? Best regards Gunnar

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  • Routing using Linux with 2 NIC cards

    - by Kevin Parker
    Configured Clear OS to be in Gateway mode on a machine with two NIC cards. eth0:192.168.2.0/24 with ip 192.168.2.27 which is connected to a modem and thus have internet connectivity. eth1:192.168.122.0/24 with ip 192.168.122.10 which is connected to other machines in LAN through switch. LAN machines with network 192.168.122.0 is not getting internet.How can they get internet Through Clear OS gateway.I have enabled packet forwarding in clear os using "ip_forward=1" What am i missing?.Can you please help me in this. Following are the static routing i have added: on LAN machine1 with ip address 192.168.122.11 ip route add 192.168.2.0/24 via 192.168.122.10 dev eth0 ip route show 192.168.2.0/24 via 192.168.122.10 dev eth0 192.168.122.0/24 dev eth0 proto kernel scope link src 192.168.122.11 But still 192.168.2.0/24 network is not reachable.Where can be the problem??

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  • How is Basic Physics applied in CS/SE?

    - by Wulf
    What basic physics principles do software engineers and/or computer scientists use to help solve specific or common problems? The first one that came to my head was creating a Physics engine for a game; physics is involved, as it requires knowledge of: Forces and Motion: Kinematics, Dynamics, Circular Motion However, I need another example, but haven't come across one that involves basic physics. Please consider the following basic physics (grade 12 level) concepts: Energy and Momentum: Work and Energy, Momentum and Collisions, Gravitational and Celestial Mechanics Electric, Gravitational & Magnetic Field: Electric Charges and Electric Field, Magnetic Fields and Electomagnetism The Wave Nature of Light: Waves and Light, Wave Effects of Light Matter-Energy Interface: Einstein’s Special Theory of Relativity, Waves, Photons and Matter, Radioactivity and Elementary Particles I will be happy with any response; Keywords for google, names of methods like raycasting, etc.

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  • windows 7 is not working with Ubuntu 12.04

    - by Anand Soni
    I have one problem, I am unable to start windows 7 which is installed with Ubuntu 12.04 because I want to utilize all resource in diff. OS. Let me tell you the installation I have done. I have installed everything with USB because my CD ROM is damaged. 1) I have installed Windows 7 in c: then I have installed Ubuntu 12.04 in C: Now when I start my PC it shows list of OS first like -Ubuntu 12.04 -Windows 7 When I click on Windows 7 it do not starts and again shows the list of OS. I have also tried to reinstall the windows 7 using USB but it gives error of something UI or Boot configuration error. Even now Ubuntu 12.04 is also not reinstalling. Now what I want to do is install windows 7 and install ubuntu 12.04 in virtual box so that I can run both system as this is not working. But can't because I can't open Window 7 even can't format my drive. Please suggest something.

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  • Is Apple getting out of the general purpose development platform business?

    - by Charles E. Grant
    I've been doing general ANSI C/Console C++/Java/Web development on Mac hardware for about ten years. I make no claims of objective superiority over other platforms, it just satisfies my personal tastes. With the success of the iPhone and the related App store there was some speculation that Apple would get out of the general purpose computer market, and become a closed software ecosystem, focusing on consumer appliances. I pooh-poohed the speculation at the time, but this week Apple announced that a) they were opening an App store for the Mac, b) Java applications would not be eligible for the App store, c) the Apple JVM was being deprecated and might not be available for future releases of OS X. I'm not a Java developer per se, but I work in a research lab that occasionally writes Java applications, and also depends on tools written Java. This has the potential to be a huge pain in the butt for us. As of now, there is no other JVM for OS X that we can point our end users to. Soy Latte and OpenJDK might be appropriate for developers, but the complexity of the installation makes them inappropriate for end users. Eventually I expect Oracle/SUN will produce a replacement JVM for OS X. More worrisome to me is that Apple used to specifically advertise that it was an excellent platform for scientific development, because they supported all major language platforms. Is the deprecation of their JVM a sign that this market no longer interests them?

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  • VirtualBox 4.0.10 is now available for download

    - by user12611829
    VirtualBox 4.0.10 has been released and is now available for download. You can get binaries for Windows, OS X (Intel Mac), Linux and Solaris hosts at http://www.virtualbox.org/wiki/Downloads The full changelog can be found here. The high points for the 4.0.10 maintenance release include .... GUI: fixed disappearing settings widgets on KDE hosts (bug #6809) Storage: fixed hang under rare circumstances with flat VMDK images Storage: a saved VM could not be restored under certain circumstances after the host kernel was updated Storage: refuse to create a medium with an invalid variant Snapshots: none of the hard disk attachments must be attached to another VM in normal mode when creating a snapshot USB: fixed occasional VM hangs with SMP guests USB: proper device detection on RHEL/OEL/CentOS 5 guests ACPI: force the ACPI timer to return monotonic values for improve behavior with SMP Linux guests RDP: fixed screen corruption under rare circumstances rdesktop-vrdp: updated to version 1.7.0 OVF: under rare circumstances some data at the end of a VMDK file was not written during export Mac OS X hosts: Lion fixes Mac OS X hosts: GNOME 3 fix Linux hosts: fixed VT-x detection on Linux 3.0 hosts Linux hosts: fixed Python 2.7 bindings in the universal Linux binaries Windows hosts: fixed leak of thread and process handles Windows Additions: fixed bug when determining the extended version of the Guest Additions Solaris Additions: fixed installation to 64-bit Solaris 10u9 guests Linux Additions: RHEL6.1/OL6.1 compile fix Linux Additions: fixed a memory leak during VBoxManage guestcontrol execute Technocrati Tags: Sun Virtualization VirtualBox var sc_project=1193495; var sc_invisible=1; var sc_security="a46f6831";

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  • Windows 8 Secureboot: How do you bootup from another device such as cd/dvd drive or usb flash etc.?

    - by Victor T.
    On PC's and laptops running an older OS, this is just a simple matter of going into the BIOS and setting the boot sequence and putting the boot cd/dvd in the drive. In many cases you can even just hit one of the F* function keys to bring up the boot sequence menu on-the-fly during POST. The main problem I'm running into is that other devices besides the primary HD is disabled when SecureBoot is enabled. So far the only way I've gotten it to work is to disable SecureBoot and enable something called legacy mode. Needless to say this make it difficult to boot things like OS recovery tools, PartitionHD backups, Linux LiveCD's and a bunch of others. Is there another procedure for doing this since it seems to mess up the Windows 8 install? By mess up I mean that after re-enabling SecureBoot and starting Windows 8 normally, the OS goes into a 'preping repair phase' for some reason that takes forever to complete before getting into a usable desktop.

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  • Organizations that encourage kids to program

    - by mwgriffith
    Since my son started going to school, I've been noticing a very serious lack of organizations to encourage kids to program or at least letting them know how to get involved in programming. Are there any groups that you know of to help kids out this area?? And I'm not referring to tools to help kids learn, I'm referring to groups that will help in getting kids interested in programming. Here are a few that I know of: Dreamspark Lego First Robotics Imagine Cup Are there anymore out there? And are there any that work at the elementary - high school levels?? Also are there any other parents that have noticed the same thing, or is this local to my area??

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  • Is it possible to upgrade HTC HD2 to Windows Mobile 7? [closed]

    - by Ladislav Mrnka
    I have HD2 over one year and I have to say it was pretty wrong purchase. Both HTC HW and MS OS (Windows Mobile 6.5) are somehow crappy. I had several crashes wich resulted in hard reset (no flashing and almost no additionally installed applications) and phone was under repair two times (2x replaced motherboard and 1x replaced dislay). After these reapirs at least HW works pretty well but OS is still bad. I would like to upgrade the phone to Windows Mobile 7. I'm not looking for some flashing (I already saw some guides). I'm ready to pay for upgrade to have it legal. Is it possible? Buying new phone just to have SW upgrade is ridiculous. Btw. My primary phone is iPhone 4 and I think on iPhone 3GS it is possible to upgrade OS iOS 4 so I would like to see similar possibility with Windows Mobile.

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  • Generating and collaborating on network map diagrams?

    - by Ian C.
    I have to turn out some network topology maps for very large networks. I'd like the format for the maps to be something other people can also edit and contribute to regardless of what software I'm using on my Mac to build them. I don't mind spending money on my end for software, but I can't require that my clients spend any money. I also can't promise my clients are also using OS X -- they could be running Linux or Windows. Is there a best software application on OS X for producing maps that I can share with other, non-OS X, users? Is there a best format for sharing topology maps that I should use when exporting the maps to disk?

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  • Need to run `nvidia-xconfig` before booting

    - by RobinJ
    I formatted my whole hard drive, and installed Elementary OS (Ubuntu 10.10) on it in an attempt to get rid of all the problems. It failed. Every since I installed the nvidia-current drivers I first need to boot into recovery mode, and run sudo nvidia-xconfig before booting the system in the normal way. If I don't do this, it will just stop at a black screen after the boot screen, responding to nothing but CTRL+ALT+DELETE and the power button. When I boot the system after running the nvidia-xconfig command I can just start working as usual. Update I suspect it's got something to do with Plymouth. I shall have to try it again before I can confirm it, but removing the quiet and splash parameters from the kernel line in /boot/grub/grub.cfg seems to help. But still, I like my Plymouth screen. A black screen with text rolling over it (or without the text) doesn't attract me much.

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  • Limit WSUS replication to only certain product classifications

    - by MDMarra
    I have four WSUS 3.0 SP2 servers that are geographically distributed. The server at our main site (we'll call it WSUS1), is the main WSUS server. All manual and auto-approvals happen here. The other three WSUS servers are replicas of this server. Currently, we are only controlling desktop OS updates through WSUS. I would like to control server OS updates through WSUS as well. There is no need for all of these server updates to be on WSUS servers at the remote sites. The only server that would need a copy of them is WSUS1. Is there a way to keep my current infrastructure as-is and add server OS updates only to WSUS1, even though the others are set up as replicas, or will I need to configure an additional WSUS server that's not replicated?

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  • Partition table damaged

    - by emaster70
    Hello, I'm currently in a terrible situation with my hdd: I was trying to install an OS side by side with my windows 7 x64 and I used the Paragon Partition Manager feature made for that. It disabled/hid/(damaged?) one of my partitions and now I can no longer access it. The partition, unfortunately, contains data I need to access urgently and I've got no backup. To complicate things even further I don't have another PC (I'm writing this msg from my iphone) and all I can rely on is a backtrac 4 disk (wkn't connect to my wifi, gets stuck obtaining IP address) and. Windows 7 x64 disk. Booting into windows fails with the pc hanging on the starting windows screen. Safe mode won't work either. Is there anything I can do? Here's the layout of the disk: Recovery partition Win partition Unallocated space (it's supposed to be my data partition) Other os partition (don't care about that, the installation of the other OS failed) Please help me, I'm desperate.

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  • Minimum percentage of free physical memory that Linux require for optimal performance

    - by csoto
    Recently, we have been getting questions about this percentage of free physical memory that OS require for optimal performance, mainly applicable to physical compute nodes. Under normal conditions you may see that at the nodes without any application running the OS take (for example) between 24 and 25 GB of memory. The Linux system reports the free memory in a different way, and most of those 25gbs (of the example) are available for user processes. IE: Mem: 99191652k total, 23785732k used, 75405920k free, 173320k buffers The MOS Doc Id. 233753.1 - "Analyzing Data Provided by '/proc/meminfo'" - explains it (section 4 - "Final Remarks"): Free Memory and Used Memory Estimating the resource usage, especially the memory consumption of processes is by far more complicated than it looks like at a first glance. The philosophy is an unused resource is a wasted resource.The kernel therefore will use as much RAM as it can to cache information from your local and remote filesystems/disks. This builds up over time as reads and writes are done on the system trying to keep the data stored in RAM as relevant as possible to the processes that have been running on your system. If there is free RAM available, more caching will be performed and thus more memory 'consumed'. However this doesn't really count as resource usage, since this cached memory is available in case some other process needs it. The cache is reclaimed, not at the time of process exit (you might start up another process soon that needs the same data), but upon demand. That said, focusing more specifically on the percentage question, apart from this memory that OS takes, how much should be the minimum free memory that must be available every node so that they operate normally? The answer is: As a rule of thumb 80% memory utilization is a good threshold, anything bigger than that should be investigated and remedied.

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  • Small footprint on a Laptop

    - by sqldebacle
    I am trying to find a solution where I can do the following: 1) Run a small footprint on my laptop 2) Run virtual instances of OS w/ no primary OS installed. All the OS that I will ever use will be all virtualized. I tried playing around with the VMware Esxi, and got it to boot it from the flash drive, etc. But this just runs the server. I cannot actually run my virtual instances from there. Anyone has done this? Something similar implemented with VMWare products without needing 2 computers will be great. Thanks, -Subhash

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  • Suggestion: ALLFILES option for RESTORE

    - by Greg Low
    The default action when performing a backup is to append to the backup file yet the default action when restoring a backup is to restore just the first file.I constantly come across customer situations where they are puzzled that they seem to have lost data after they have completed a restore. Invariably, it's just that they haven't restored all the backups contained within a single OS file. This happens most commonly with log backups but also happens when they have not restored the most recent database backup file.It is not trivial to achieve this within simple T-SQL scripts, when the number of backup files within the OS file is unknown. It really should be.I'd like to see a FILES=ALLFILES option on the RESTORE command. For RESTORE DATABASE, it should restore the most recent database backup plus any subsequent log files. For RESTORE LOG (which is the most important missing option), it should just restore all relevant log backups that are contained.If you agree, you know what to do: please vote:  https://connect.microsoft.com/SQLServer/feedback/details/769204/option-to-restore-all-backups-files-within-a-media-setAlternately, how would you write a T-SQL command to restore all log backups within a single OS file where the number of files is unknown? Would love to hear creative solutions because all the ones that I think of are pretty messy and need dynamic SQL. 

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