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• Intel Pentium 4 vs. Faster Celeron

  - by Synetech inc.

  A few months ago my motherboard died, so I bought a used computer that had a 2.4GHz Celeron. My old system had a 1.7GHz Pentium 4, so now I’m trying to decide which CPU to use. Obviously a P4 is preferable over a Celeron, but the Celeron is (significantly?) faster than the P4. I’m wondering if the faster Celeron might be better for certain tasks (ie, stronger but dumber is better at some things than smarter but weaker). I tried Googling for some reviews and comparisons for graphs to get a clear depiction of which is better overall, but found nothing that helped. (I did manage to find one page that indicates (apparently by poll, not benchmark) that the Celeron is better.) So which CPU should I use? Does anyone know of some graphs that I can use to compare the two?

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• "A copy of Firefox is already open. Only one copy of Firefox can be open at a time."

  - by Isaac Waller

  I cannot start Firefox on my Mac. It just says "A copy of Firefox is already open. Only one copy of Firefox can be open at a time." I have tried restarting the computer. Any fixes? You have suggested deleting the lock files in my profile, but, I don't have a profile. I was trying to fix the problem in question http://superuser.com/questions/3275/firefox-on-mac-slow-slow-slow by deleting my profile, so I deleted it, and this came up. So I cannot delete the lock files because they don't exist.

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• Are there any concrete examples of where a paralellizing compiler would provide a value-adding benefit?

  - by jamie

  Paul Graham argues that: It would be great if a startup could give us something of the old Moore's Law back, by writing software that could make a large number of CPUs look to the developer like one very fast CPU. ... The most ambitious is to try to do it automatically: to write a compiler that will parallelize our code for us. There's a name for this compiler, the sufficiently smart compiler, and it is a byword for impossibility. But is it really impossible? Can someone provide a concrete example where a paralellizing compiler would solve a pain point? Web-apps don't appear to be a problem: just run a bunch of Node processes. Real-time raytracing isn't a problem: the programmers are writing multi-threaded, SIMD assembly language quite happily (indeed, some might complain if we make it easier!). The holy grail is to be able to accelerate any program, be it MySQL, Garage Band, or Quicken. I'm looking for a middle ground: is there a real-world problem that you have experienced where a "smart-enough" compiler would have provided a real benefit, i.e that someone would pay for? A good answer is one where there is a process where the computer runs at 100% CPU on a single core for a painful period of time. That time might be 10 seconds, if the task is meant to be quick. It might be 500ms if the task is meant to be interactive. It might be 10 hours. Please describe such a problem. Really, that's all I'm looking for: candidate areas for further investigation. (Hence, raytracing is off the list because all the low-hanging fruit have been feasted upon.) I am not interested in why it cannot be done. There are a million people willing to point to the sound reasons why it cannot be done. Such answers are not useful.

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• Creating a bootable flash without overlayfs

  - by Septagram

  I want to create an USB stick to carry my Ubuntu everywhere around with me. It's not intended to spread Ubuntu by installing it everywhere, but rather for running my configured system on any computer I come across. So far, I went with installing Ubuntu with unetbootin, however, I have some issues with this. When installed with netbootin, the original disk image is kept intact on the flash drive, forever. Also, a file is created for persistent storage and during boot it is accessed together with the image by overlayfs. This, in my opinion, has the following problems: If system is updated regularly, then files from the image are overwritten in persistent storage, doubling their size and wasting precious space. Persistent storage has a fixed size that you have to define from the start, again, wasting precious space. I'm not 100% sure, but maybe using overlayfs makes disk access slower, and more so on the relatively slow devices. So I'd like to find another solution: either to get rid of the original image or to install Ubuntu "normally" on the separate ext2 partition, or maybe even install it in the main vfat partition on the USB stick. Suggestions?

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• Ubuntu 12.04 does not suspend with proprietary driver for Radeon 6800

  - by Mike

  I'm running Ubuntu 12.04 x86_64 (though these issues have existed in previous releases too) and have a Radeon 6800 graphics card. I've run into issues with the open-source driver (the system would randomly hang when shutting down) so I switched to the proprietary driver (I compiled it myself using these instructions), but I am having new problems now. The main issue is that when I go into sleep mode, about 50-75% of the time, the screen goes black but the monitor does not actually shut off, and I can hear that the fans/hard drive are not suspending either. I can't get the computer to wake up (Ctrl+Alt+F1,2,3,etc. does not work), and I always end up force shutting down with the power button. I'd really appreciate help! Here is some information that might be helpful: $ fglrxinfo display: :0 screen: 0 OpenGL vendor string: Advanced Micro Devices, Inc. OpenGL renderer string: AMD Radeon HD 6800 Series OpenGL version string: 4.2.11631 Compatibility Profile Context $ dmesg | grep fglrx [...] [ 6.718606] [fglrx] module loaded - fglrx 8.96.4 [Apr 5 2012] with 1 minors [...]

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• WCF WebService: Client can't connect, as soon as request client cerficate is activated.

  - by Hinek

  I have an .NET 3.5 WCF WebService hostet in IIS 6 and using a SSL certificate. The communication between client and server works. Then I activate "request client certificate" and the client can't connect anymore Exception: System.ServiceModel.Security.SecurityNegotiationException: Could not establish secure channel for SSL/TLS with authority 'polizei-bv.stadt.hamburg.de'. Inner Exception: System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel. The certificate, the client uses is in the certificate store (local computer), the root ca is int the trusted root certification authorities store. Where can I check for an explanation on the server side? How can I check if the client really supplies it's certificate (client is not on my side)?

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• Unable to extend desktop

  - by CSharperWithJava

  I'm trying to hook up my TV to my computer as a gaming/multimedia center but I'm having troubles setting it up. I have a custom built machine running Windows 7 RC. It has an ATI Radeon 4800 video card with 2 dvi output and 1 S-video output. I have an s-video to composite adapter that connects to my tv. (It's an old TV with only Cable, composite, and s-video connections). I can switch the desktop to my TV without a problem, but I can't duplicate or extend my desktop onto it. I've installed the latest drivers and Catalyst Control Center, but it won't let it work any more readily than Windows would. Any suggestions? Would using an s-video cable instead of the adapter change anything? (The only reason I use the adapter is because it came with the graphics card) (Edit) I installed the latest drivers and I can now duplicate the screen (show on one monitor and on the TV), but I still can't extend the desktop.

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• How often is your "Go-To" language the same as your favorite??

  - by K-RAN

  I know that there's already a question asking for your favorite programming language here. I'm curious though, what's your go-to language? The two can be very different. For example, I love Haskell. I learned it this past semester and I fell in love with it's very concise solutions and awesome syntax (I love theoretical math so something like fib = 1 : 1 : [ f | f <- zipWith (+) fibSeq (tail fibSeq)] makes my inner mathematician and computer scientist jump with joy!). However, the majority of my projects for classes and jobs have been in C/C++ & Java. As a result, most of the time when I'm testing something like an algorithm or Data Structure I go straight to C++. What about you guys? What languages do you love and why? What about your go-to language? What language do you use most often to get things done for work or personal projects and why? How often does a language fall into both categories??

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• MacBook Pro screen goes dark

  - by Mike M

  I've had my MacBook Pro for two years now; no problems so far (it has had 3rd party RAM from the get go). Today, I'm copying a particularly large VM from an External disk drive to local MacBook disk. It has about 3GB to go and I take off to do some other things and when I come back my screen is "dark". The computer is still on but I can't see anything. I forced a reboot by holding down the power button, it starts up with the "chimes", but still no screen. I've done this several times. Any ideas? Do you think the hard disk activity caused it to get too hot?

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• Floating point undesireable in highly critical code?

  - by Kirt Undercoffer

  Question 11 in the Software Quality section of "IEEE Computer Society Real-World Software Engineering Problems", Naveda, Seidman, lists fp computation as undesirable because "the accuracy of the computations cannot be guaranteed". This is in the context of computing acceleration for an emergency braking system for a high speed train. This thinking seems to be invoking possible errors in small differences between measurements of a moving object but small differences at slow speeds aren't a problem (or shouldn't be), small differences between two measurements at high speed are irrelevant - can there be a problem with small roundoff errors during deceleration for an emergency braking system? This problem has been observed with airplane braking systems resulting in hydroplaning but could this actually happen in the context of a high speed train? The concern about fp errors seems to not be well-founded in this context. Any insight? The fp is used for acceleration so perhaps the concern is inching over a speed limit? But fp should be just fine if they use a double in whatever implementation language. The actual problem in the text states: During the inspection of the code for the emergency braking system of a new high speed train (a highly critical, real-time application), the review team identifies several characteristics of the code. Which of these characteristics are generally viewed as undesirable? The code contains three recursive functions (well that one is obvious). The computation of acceleration uses floating point arithmetic. All other computations use integer arithmetic. The code contains one linked list that uses dynamic memory allocation (second obvious problem). All inputs are checked to determine that they are within expected bounds before they are used.

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• Intermittent ethernet connectivity

  - by Amey Jah

  I am facing a weird problem. I am connecting to my dsl modem via ethernet. After booting, sometimes Ubuntu 10.10 does not detect the eth0 card properly or does not connect to the modem. I have made the following observations: My modem is fully on. All indicators are on except ethernet, which is blinking continuously. My network indicator applet informs me that I am connected to modem, but I am not able to browse as it has not established connection with modem. I need to power off and on (restart) the modem several times OR disconnect/connect (via network applet) several times, before the system can establish a connection with the modem. Once it establishes the connection, the ethernet LED (on modem) stops blinking and glows continuously. However, I do not see this problem every time I reboot or start my computer. 3/5 time, it connects to the modem in a single attempt. Friends, I am not able to understand root cause of this problem. Plus I do not know what kind of logs should be attached. If you want any logs please give me command to run, and I will paste the result for you. Note: I ran system testing when above problem happened. Follow this link to download result.

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• Fresh install on SSD with Ubuntu and Windows Vista, using whole disk encryption for Ubuntu

  - by nategator

  I would like to do a fresh install on a OCZ Vertex Plus R2 SSD 60GB drive I purchased on the cheap. Since the AES-encryption looks like it may not work optimally for this drive, I would like to set up a dual-boot to Windows Vista (the only Windows copy I have for clean install purposes) and Ubuntu 12.04 with the best encryption scheme possible. My plan is to have Windows around just in case I need to use a program that won't work with Wine and Ubuntu as my daily OS with all of my information secured in case the laptop is ever stolen or sold. Although this setup will not provide a lot of space, I think I can squeeze both OSes and have enough for second-computer office tasks. So, my questions are: Which OS should I install first, Ubuntu or Vista? Any special considerations when partitioning the drive? How should I install Ubuntu to ensure full disk encryption for the Linux partition(s) and or my daily computing? Is there a significant performance upgrade with doing a solo install of Ubuntu instead of a dual boot setup? Will TRIM, for example, work correctly? Are there any significant security concerns with going the route of a dual-boot, other than the fact that any activity on Windows may be fully recoverable if the drive is stolen or sold? Thanks in advance!

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• Connecting to SQL Server on Parallels Desktop with PHP

  - by Zen Savona

  well I recently bought a Mac and am using it as my primary computer. Because I am required to work with MSSQL via PHP, I have installed Parallels Desktop and run Server 2008 R2 on it. I am using the same mixed mode authentication which I previously had on windows. When I attempt to connect to the server with PHP using either a new test file or my old code, it just doesn't find the server. I have tried running PHP on the XP install with parallels, and using the hostname as COMPUTERNAME\SQLEXPRESS, LOCALIP\SQLEXPRESS localhost localip etc, PHP never finds the server. Also note that I can connect to the database server using Management Studio without problems, so SQL Server is running. Please note that both PHP and MSSQL are running within the virtualised environment. Any contribution is appreciated

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• Power cut during Ubuntu upgrade to 10.04 - boots to command line, apt-get and dpkg do not work.

  - by Macha

  I was upgrading Ubuntu to 10.04, when a tripswitch tripped, cutting power to the computer. When it was restarted, it booted into a command line prompt. Google tells me to try: sudo dpkg --configure -a This gets me a lot of output that ends with a list of packages. I can't tell you what the output is, as piping the output to more/less does not work (still just all scrolls by and moves to next prompt), and redirecting it to a file just results in an empty file. Google also suggested: sudo apt-get install -f This also didn't work. Is a fresh install the only solution at this point?

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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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• Java Applet Tower Defence Game needs tweeking

  - by Ephiras

  Hello :) i have made a tower defence Game for my computer science class as one of my major projects, but have encountered some rather fatal roadblocks. here they are creating a menu screen (class Menu) that can set the total number of enimies, the max number of towers, starting money and the map. i tried creating a constructor in my Main class that sets all the values to whatever the Menu class passes in. I want the Menu screen to close after a difficulty has been selected and the main class to begin. Another problem i would really like some help with is instead of having to write entire arrays i would like to create a small segment of code that runs through an entire picture and sets up an array based on that pixels color.this way i can have multiple levels just dragged into a level folder and have the program read through them. users can even create their own. so a 1 if its yellow, a two if blue and a 3 if purple, then everything else = 0; you can download all the classes and code uif you'd like here sorry about having to redirect you but i wasn't sure how to efficently add a code spoiler. help is greatly appreciated

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• Looking for someone to point me in the right direction. I want to learn how to use hosted servers

  - by Leisure

  TL;DR: I want a Java program to run on a server, I want the server to forward a particular port from external to internal IP, I want store a few files on the server. Guides please. So I made a hack job Java program that acts as a server for my android application. It stores data in text files and HTML files, uploads them via FTP to my webhost, and manages socket connections (using port forwarding) with any phones connected. Right now I'm running it on NetBeans on my home computer. I know that it will probably slow down or crash once about 50 phones are connected at once. Is there any way I can run this program on a server with a high bandwidth? Can someone please find me a guide for that? I'm noob and don't know where to start looking. I seriously don't know anything about renting or using servers - I need a nice guide, and recommendations. My requirements for the server: Can handle about 2k socket connections at once Can run my Java code and store my txt files Can give me a port and an IP address so TCP/IP clients can be connected My budget: $50 CAD per month. Please someone set my ship sailing in the right direction, I really don't know where to look for resources.

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• How to control the time before Windows 7 wakes from standby and hibernates?

  - by Ricket

  Ever since I reformatted my laptop, it just hasn't been the same. Before reformatting I noticed that if it was in standby for around 24 hours, it would automatically wake up and go into hibernation. I think that's a pretty cool feature and I didn't mind it. But lately, it's been waiting only a few hours (maybe 3-6; I haven't really timed it or paid enough attention) before waking up from standby and going into hibernation. There have been a few instances where this has been bothersome, and I'd like to change it back to a nice long wait time. Where is this setting? What setting in Windows controls the time before the computer wakes up from standby and goes into hibernation?

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• How complex of a daemon should be run through inetd?

  - by amphetamachine

  What is the general rule for which daemons should be started up through inetd? Currently, on my server, sshd, apache and sendmail are set up to run all the time, where simple *NIX services are set up to be started by inetd. I'm the only one who uses ssh on my computer, and break-in attempts aren't a problem because I have it running on a non-standard port, and my HTTP server gets maybe 5 hits a day that aren't GoogleBot. My question is, what are the benefits vs. the performance hits associated with running a complex daemon like sshd or apache through superserver, and what, if any successes or failures have you had running your own daemons in this manner?

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• How can I connect to my Airport Extreme Shared Disk using Windows?

  - by matt ryan

  I have a shared disk attached to my Airport Extreme, which I can connect to remotely in OS X through the finder via command - k, and entering in the proper address: afp://test.dyndns.org:1111 1111 being the port I've reserved for the disk in the AE port mapping. This is such a great feature, but I don't always have access to a Mac. My question is how can I connect to this drive via Windows XP? Please note, that the shared drive is a Drobo FS and formatted to handle both Windows and Mac OS. I've tried mapping a network drive via My Computer - Tools - Map Network Drive and entering: \\test.dyndns.org:1111\Drobo-Name I've also tried Start - Run and entering the same, both with and without the port #.

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• Huwawei E220 broadband dongle not working

  - by Roshnal

  The problem is, I have used Ubuntu from 6.10 upto 11.10. And upto 11.04 I used my same USB 3G dongle to connect to broadband and it worked fine. But 2 days ago I upgraded to Ubuntu 11.10 and broadband is not working. It detects my dongle and creates a connection without a problem, but when connecting it just keeps on and on for a long time and then say I'm offline. So I did a clean install and the same thing occurred. But I also have a netbook and its got Ubuntu 11.10. I tried using the same dongle for internet on that netbook and it worked fine without any issues. But this isn't a problem with my USB port on my main machine or something like that because I'm also using Windows on my main machine (dual-boot) and its working fine. My hardware: Main computer (one that I'm trying to connect): 2.8GHz dual core Intel 2GB RAM 500GB Sata II HDD 384MB Video Memory (Intel G31/G33 chipset) Ubuntu 11.10 (32bit) My NetBook (broadband working fine): 1.6GHz Intel Atom (dual core) 1GB DDR3 RAM 250GB HDD 128MB Video Memory (Intel something-I-can't-remember) Ubuntu 11.10 (32bit) My dongle is a Huawei E220 and ISP is Dialog GSM (I'm in Sri Lanka) So any idea why this is? I really love Ubuntu and this is bugging me off.. Any help greatly appreciated. Regards, Roshnal

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• Remote location looses connectivity

  - by user24559

  I have a remote location that has constant internet access using DSL. The remote location only has three Linksys cameras that use the internet access with a router. There is no computer on the network. The router is configured to use the DYN.org service to keep the IP address updated if the internet provider assigns a new ip address. The problem I am having is the router after a period of time stops responding to incoming ping requests and the cameras are shown offline. However, if I keep one of the cameras constantly streaming data then the connection to all the cameras works just fine all the time. How can I keep the router from appearing to be sleeping and not responding to incoming requests? The router is the Linksys WRT300N.

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• new ubuntu server installation - java server not receiving packets

  - by James

  I have developed a Java server which listens for UDP packets which come from mobile devices. At the moment, it works correctly if I run my Server on my windows PC. I can receive and respond to the UDP packets sent from my phone (over 3g, not wifi). However, I am trying to run the Server on a different computer which I found lying around my house. I have basically done a clean install of Ubuntu Server edition, updated it, installed the java run time environment and configured port forwarding to allow connections on the appropriate port. I have also tried to disable the firewall. The problem is, it doesn't appear as if the server is receiving any packets and I've exhausted my brain thinking on how to solve/debug the problem. Can anyone suggest to me what the problem might be? or more likely something I can do to help me find out more information about what is going wrong.

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• NT4 server generate too much weird DNS queries, How can i see the source PID?

  - by Hanan N.

  I have a NT4 server that in the last two weeks started to generate too many weird DNS queries to the DNS server is set to use. I have got warnings from the IPS system that it has blocked the responses from the DNS server back to the NT4 server. The queries it generate doesn't relate to any computer in the network, it is like 120624100088.xxxxxxx.net where xxx is the internal network, the numbers are just random at each query. I have done some research on how to get the PID that is generating the queries, and i found that only Process Monitor could give me that information, but since it is NT4 system Process Monitor doesn't work on it. It is a production server and i am just can't stop services as i want. I would like to get your advice on how can i get the PID that is generating these queries? Thanks.

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• How does font rendering actually work?

  - by Andrea

  I realize that I know essentially nothing about the way fonts get rendered in my computer. From what I can observe, font rendering is generally made in a consistent way throughout the system. For instance, the subpixel font hinting settings that I configure in my DE control panel have influence on text which appears on window borders, in my browser, in my text editor and so on. (I should observe that some Java applications show a noticeable difference, so I guess they are using a different font rendering mechanism). What I get from the above is that probably all applications that need font rendering make use of some OS (or DE)-wide library. On the other hand, browsers usually manage their own rendering through a rendering engine, that takes care of positioning various items - including text - according to specific flow rules. I am not sure how these two facts are compatible. I would assume that the browser would have to ask the OS to draw a glyph at a given position, but how can it manage the flow of text without knowing beforehand how much space the glyph will take? Are there separate calls to determine the glyph sizes, so that the browser can manage the flow as if characters were little boxes that are later filled in by the OS? (Although this does not take care of kerning). Or is the OS responsible for drawing a whole text area, including text flow? Does the OS return the rendered glyph as a bitmap and leaves it to the application to draw that on the screen?

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