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• How do I install RALink 3290?

  - by user108222

  I have been trying for awhile since I removed Win8 from my laptop to get this Bluetooth/Wireless Card working and I've got it so that it at least recognizes wireless, but every time I try to actually use the wireless, I get kernel panics or everything crashes. Can someone explain to me how to install this driver: http://www.ralinktech.com/en/04_support/support.php?sn=501 So that I can actually use the wireless on my laptop (and perhaps even the bluetooth).

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• Dell Vostro 1520 wifi not working with Ubuntu 12.04

  - by user65696

  I have installed Ubuntu 12.04 on Dell Vostro 1520 Laptop. But found Wifi is hardware locked, though wifi is working perfectly fine with Windows 7 in the same laptop. I tried to upgrade the drivers as mentioned in other posts/forums but could not resolve the issue. I had the similar problem with versions 11.* as well. Last time the Wifi worked with 10.* version. Please help me to get it resolved.

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• Organization &amp; Architecture UNISA Studies &ndash; Chap 13

  - by MarkPearl

  Learning Outcomes Explain the advantages of using a large number of registers Discuss the way in which compilers optimize register usage Discuss the evolution of CISC machines Describe the characteristics of RISC architecture Discuss the RISC vs. CISC controversy Describe the way in which RISC and CISC design principles can be combined Instruction Execution Characteristics To understand the the line of reasoning of RISC advocates, we need a brief overview of instruction execution characteristics. These include… Operations Operands Procedure Calls These three sections can be studied in depth in the textbook at pages 503 - 505 A number of groups have come up with the conclusion that the attempt to make the instruction set architecture closer to HLLs (High Level Languages) is not the most effective design strategy. Rather HLL’s can be best supported by optimizing performance of the most time-consuming features of typical HLL programs. Generally 3 main characteristics came up to improve performance… Use a large number of registers or use a compiler to optimize register usage Careful attention needs to be paid to the design of instruction pipelines A simplified (reduced) instruction set is indicated The use of a large register optimization One of the most important design principles of RISC machines is the use of a large number of registers. The concept of register windows and the use of a large register file versus the use of cache memory are discussed. On the face of it, the use of a large set of registers should decrease the need to access memory. The design task is to organize the registers in such a fashion that this goal is realized. Read page 507 – 510 for a detailed explanation. Compiler-based register optimization   Reduced Instructions Set Architecture There are two advantages to smaller programs… Because the program takes up less memory, there is a savings in that resource (this was more compelling when memory was more expensive) Smaller programs should improve performance, and this will happen in two ways – fewer instructions means fewer instruction bytes to be fetched and in a paging environment smaller programs occupy fewer pages, reducing page faults. Certain characteristics are common to RISC processors… One instruction per cycle Register-to-register operations Simple addressing modes Simple instruction formats RISC vs. CISC After initial enthusiasm for RISC machines, there has been a growing realization that RISC designs may benefit from the inclusion of some CISC features CISC designs may benefit from the inclusion of some RISC features

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• is a factory pattern to prevent multuple instances for same object (instance that is Equal) good design?

  - by dsollen

  I have a number of objects storing state. There are essentially two types of fields. The ones that uniquly define what the object is (what node, what edge etc), and the oens that store state describing how these things are connected (this node is connected to these edges, this edge is part of these paths) etc. My model is updating the state variables using package methdos, so these objects all act as immutable to anyone not in Model scope. All Objects extend one base type. I've toyed with the idea of a Factory approch which accepts a Builder object and construct the applicable object. However, if an instance of the object already exists (ie would return true if I created the object defined by the builder and passed it to the equal method for the existing instance) the factory returns the current object instead of creating a new instance. Because the Equal method would only compare what uniquly defines the type of object (this is node A nto node B) but won't check the dynamic state stuff (node A is currently connected to nodes C and E) this would be a way of ensuring anyone that wants my Node A automatically knows it's state connections. More importantly it would prevent aliasing nightmares of someone trying to pass an instance of node A with different state then the node A in my model has. I've never heard of this pattern before, and it's a bit odd. I would have to do some overiding of serlization methods to make it work (ensure when I read in a serilized object I add it to my facotry list of known instances, and/or return an existing factory in it's place), as well as using a weakHashMap as if it was a weakHashSet to know rather an instance exists without worrying about a quasi-memory leak occuring. I don't know if this is too confusing or prone to it's own obscure bugs. One thing I know is that plugins interface with lowest level hardware. The plugins have to be able to return state taht is different then my memory; to tell my memory when it's own state is inconsistent. I believe this is possible despit their fetching objects that exist in my memory; we allow building of objects without checking their consistency with the model until the addToModel is called anyways; and the existing plugins design was written before all this extra state existed and worked fine without ever being aware of it. Should I just be using some other design to avoid this crazyness? (I have another question to that affect I'm posting).

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• installed ubuntu 12.04 and no wireless internet at all

  - by Memoq

  I'm extremely new to ubuntu. I installed 12.04 on a laptop that had no os. I've tried following these forums to troubleshoot my internet problems only to be confused by all the steps. I need help. I'm willing to follow any instruction as long as they make sense. Any help would be nice. The equipment i have is a Dell inspiron 1100 laptop wireless card is D link 2.4 dwl -g650 product ar5212/ar5313

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• boot problem in samsung

  - by user286366

  i have formatted my laptop completely and installed Ubuntu 14.4 after installation Ubuntu is not booting directly i have to put the pen drive(which has Ubuntu 14.4 live cd) every time on start up and press f4 which is for recovery after booting if take the pen drive then no problem its working normally my laptop is Samsung np370 with Intel i5 3rd gen processor with 6gb ram and 1tb hard disk please help me

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• My USB bootable thumb drive, no longer boots on a single particular computer on which it previously worked

  - by LiamMeron

  I created a bootable drive, booting CrunchBang, about 2 months ago. About a month ago, I booted into it on another laptop. After shutting down, I have been unable to get it to boot on my own laptop, despite having worked previously. I can still boot into it on my desktop, and can also boot into it on all other computers that I have tried. If I plug it in when I am running Ubuntu, the Home and / folders mount, the only error being that for some reason my PC likes to try and mount the swap partition too, which naturally, gives an error. The BIOS settings are all still setup to boot from USB. When I boot, all I get is a black screen with the white cursor, it will stay there for as long as I leave it. If it is worth anything, I have GRUB loader installed on the drive. The partitions look a little odd, but I am rather unfamiliar with how they are dealt with. The first partition, /, is sdb1 and has the bootable flag. The second partition is an extended system, and is sdb2. The third partition, according to GParted, seems to be nested under the second. This is the swap partition, and it is sdb5 The fourth partition is my home partition and is sdb6 and is also nested under the extended system. The first and fourth partitions are ext4. I don't know if that helps, but the more info, the better accuracy, generally. Thanks. EDIT: I tried reinstalling GRUB on the drive, but that didn't work. However, when I reinstalled GRUB on my laptop, I did it with my USB thumbdrive in. This caused the GRUB updater to find the /boot folder and add the proper details into my laptop's GRUB loader. I could log into CrunchBang from my laptop's GRUB but I was still unable to boot directly to the drive. It looked like my BIOS is unable to find the bootloader. I am unable to install GRUB to a partition I just created, a /boot partition at the start of the drive, GRUB just doesn't allow it. I think I'm going to have to reinstall #! on my drive, which won't be a great loss as I haven't put much time into it.

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• Should i worry about company's Reputation before joining it...

  - by Shekhar_Pro

  My question is particularly in context of this Question asked recently on this site. I am a fresh graduate and would soon be applying for jobs. But the above mentioned question has raised concerns for me. Should i care about the company i am going to join. Specially since for me Yahoo is a very reputed corporation and i duly respect it, in fact i would be proud to work for it if given the chance. And the OP of the question was a Senior Software Engineer, i don't think something could have gone so wrong that he feels shame for have worked there. Well i won't like to have this situation in my career. Until now for me the criteria for approaching a company were like - it should have Good, knowledgeable and Experienced team, it should provide me with tasks that will always challenge me to think and learn more, etc. After all a task is task and you do always learn something from it. But in view of mentioned question should i also consider other things... Please give your answers and most importantly an opinion from your own experience.

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• Ubuntu 14.04 Slow, High CPU Usage

  - by user273012

  I experienced CPU strange behavior after installing Ubuntu 14.04, at 5 or 10 minutes, CPU usage suddenly increased about 50%, that's really slow my laptop down (Ubuntu 13.10 worked fine by the way) Here is my laptop specs : ASUS A43SA Intel Core i3-2330M 2.20 GHz 4 GB of RAM I noticed this when the first installation, even after I disabled online and file search, even after I switch to GNOME 3, and even after I used GNOME Fallback Session, how to solve this?

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• Are we queueing and serializing properly?

  - by insta

  We process messages through a variety of services (one message will touch probably 9 services before it's done, each doing a specific IO-related function). Right now we have a combination of the worst-case (XML data contract serialization) and best-case (in-memory MSMQ) for performance. The nature of the message means that our serialized data ends up about 12-15 kilobytes, and we process about 4 million messages per week. Persistent messages in MSMQ were too slow for us, and as the data grows we are feeling the pressure from MSMQ's memory-mapped files. The server is at 16GB of memory usage and growing, just for queueing. Performance also suffers when the memory usage is high, as the machine starts swapping. We're already doing the MSMQ self-cleanup behavior. I feel like there's a part we're doing wrong here. I tried using RavenDB to persist the messages and just queueing an identifier, but the performance there was very slow (1000 messages per minute, at best). I'm not sure if that's a result of using the development version or what, but we definitely need a higher throughput[1]. The concept worked very well in theory but performance was not up to the task. The usage pattern has one service acting as a router, which does all reads. The other services will attach information based on their 3rd party hook, and forward back to the router. Most objects are touched 9-12 times, although about 10% are forced to loop around in this system for awhile until the 3rd parties respond appropriately. The services right now account for this and have appropriate sleeping behaviors, as we utilize the priority field of the message for this reason. So, my question, is what is an ideal stack for message passing between discrete-but-LAN'ed machines in a C#/Windows environment? I would normally start with BinaryFormatter instead of XML serialization, but that's a rabbit hole if a better way is to offload serialization to a document store. Hence, my question. [1]: The nature of our business means the sooner we process messages, the more money we make. We've empirically proven that processing a message later in the week means we are less likely to make that money. While performance of "1000 per minute" sounds plenty fast, we really need that number upwards of 10k/minute. Just because I'm giving numbers in messages per week doesn't mean we have a whole week to process those messages.

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• database independent coding framework options?

  - by statirasystems

  Background: I have not programmed in a while besides doing VBA and a little VB.NET. So please forgive my language use. I'm green and have a head cold. I am reading all I can now, but I have no programming circles to draw from. The information I am providing is to help guide you to what I am looking for. I am not confident I can ask the question properly. Story: I have four different projects that I am starting. Obviously I won't be working on all at the same time however they each will have similar needs and be inter related. They are as follows: Desktop Environment/System User Interface - basically a product that runs on major computers via mono or .net that unifies the look and functions. In the context of the up coming question it would be able to directly access data of various types. It would work in tandum with my office suite, system manager, and network application framework. Office Suite - technically it would not be a suite since I will be doing it from one interfacel except for the Communications Application. As far as the question, it will need to be able to link to various data sources for storing files and using, manipulating, and presenting information. System Manager - an intellegent system to manage and administer the entire network and all equipment. As far as the question, needs to be able to access data for archiving and and for accessing it's own settings stored in various formats, sql or xml. Network Application Framework - A complete system that can be used for ERP, CRM, CMS, Errata, File Management, and so on. As to the question to be able to access it's own or interlink with existing applications. Requirement: C#, Simplifies and reduces coding, use the same code to access diffent databases(ie MySQL, MS SQL, ACCESS, XML, ...), Mono would be nice but not a must, Question: What librarys, frameworks, or other options would be able to help with this? Is there a good resource to guide me? I don't want arguing over what is best, just information to help me further understand and make an educated decision.

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• Cant burn the iso file on disc and usb will not startup

  - by Jason

  I am having very big problems trying to get this going for my old laptop. I tried burning the iso image with 5 different iso burning programs and none of the disks worked none started up. Then I tried to do the USB way used the program that puts it on the usb for you it starts up on my laptop fine but will not start up on my compaq presario 2178cl. If any1 can help me with this problem I would be much appreciative ty for your time.

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• Installing Ubuntu in EFI mode Cant go beyond GRUB Menu

  - by Vulcan

  I created a LiveUSB of Ubuntu 12.04.3 LTS using Pendrive Linux. -Created a separate 30GB partition using Windows 8 Disk Management -Disabled Secure Boot (Didn't find an option to disable EFI boot) -Disabled Fast Startup The laptop starts the GRUB menu shows up but it doesn't go beyond that no matter what option i choose. After choosing any option the screen goes blank but the power is still on i can see the power light. My laptop is HP-n012tx processor- Intel i5 4200U Video Card- 2GBnVidia 740M The GRUB menu i see http://i.stack.imgur.com/buEAn.png

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• MySQL performance over a (local) network much slower than I would expect

  - by user15241

  MySQL queries in my production environment are taking much longer than I would expect them too. The site in question is a fairly large Drupal site, with many modules installed. The webserver (Nginx) and database server (mysql) are hosted on separated machines, connected by a 100mbps LAN connection (hosted by Rackspace). I have the exact same site running on my laptop for development. Obviously, on my laptop, the webserver and database server are on the same box. Here are the results of my database query times: Production: Executed 291 queries in 320.33 milliseconds. (homepage) Executed 517 queries in 999.81 milliseconds. (content page) Development: Executed 316 queries in 46.28 milliseconds. (homepage) Executed 586 queries in 79.09 milliseconds. (content page) As can clearly be seen from these results, the time involved with querying the MySQL database is much shorter on my laptop, where the MySQL server is running on the same database as the web server. Why is this?! One factor must be the network latency. On average, a round trip from from the webserver to the database server takes 0.16ms (shown by ping). That must be added to every singe MySQL query. So, taking the content page example above, where there are 517 queries executed. Network latency alone will add 82ms to the total query time. However, that doesn't account for the difference I am seeing (79ms on my laptop vs 999ms on the production boxes). What other factors should I be looking at? I had thought about upgrading the NIC to a gigabit connection, but clearly there is something else involved. I have run the MySQL performance tuning script from http://www.day32.com/MySQL/ and it tells me that my database server is configured well (better than my laptop apparently). The only problem reported is "Of 4394 temp tables, 48% were created on disk". This is true in both environments and in the production environment I have even tried increasing max_heap_table_size and Current tmp_table_size to 1GB, with no change (I think this is because I have some BLOB and TEXT columns).

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• How to create a wifi hotspot in ubuntu 12.04 and use it on WP7.5?

  - by VPCEB14EN

  I have been trying for many days to create a wifi hotspot with my laptop running ubuntu 12.04 and connect it to my windows phone7.5 based HTC Mozart. I have gone through many articles related to this, but none of them help. I create a wifi hotspot as suggested by some experts, but it isn't detected either by my phone or on other laptops. My laptop is Sony Vaio VPCEB14EN with these specifications .

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• Starting / Shutting down Problem

  - by richter12

  i have ubuntu 12.04 installed on my laptop. There is the following starting/shutting down problem: When clicking the power button, the laptop starts for 1 second and after that abruptly shuts down. When starting again everything works normal. But after shutting down and starting again, the PC again has the same problem. This problem wasnt there when using Windows. What can I do? Thank you very much! Greetings, Richter

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• Bluetooth not finding any devices on 12.10

  - by DeanGrobler

  When I switch on my bluetooth and search for devices my laptop doesn't find any even though there's plenty in the area. Most likely this is because of drivers that are missing. So what I want to know is if there's a way I can view the exact details of what bluetooth device I have built into my laptop so I can start searching for a linux version of the needed driver. Any tips? PS - Running 64bit 12.10

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• Getting the newest version of Ubuntu from 9.04

  - by user286985

  Okay so im new to this whole linux/ubuntu stuff. I need a step by step answer to how to get the newest version of ubuntu from my 9.04 version on my laptop. I was given this laptop as a gift and im still learning this step by step since i have been useing windows my whole life. I heard that i cant update since i have to go version to version so if someone could tell me how to just install the newest version while running 9.04. Thank you(:

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• Screen configuration not saved after first reboot

  - by user20795

  PROBLEM - When installing UBUNTU Natty on my friends Laptop with a HDMI cable attached to both TV and Laptop both screens echo each other BUT when reboot has taken place nothing is displayed on the external screen. Another user has reported the same problem so far ! http://ubuntuforums.org/showthread.php?t=1764389&highlight=hdmi - Gives a clearer description of what we are both experiencing The UBUNTU/Natty install drives both screens but the first reboot does not ? Any ideas anyone

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• No Webcam Device

  - by Aliyah

  deeva@androliyah-A6200:~$ sudo lshw -C video [sudo] password for deeva: *-display description: VGA compatible controller product: Core Processor Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 02 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:43 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:e080(size=8) deeva@androliyah-A6200:~$ How do I get my webcam to work?

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• Which Content Management System (CMS)/Wiki should I use?

  - by danlefree

  This is a general, community wiki catch-all question to address non-specific "I need a CMS or Wiki that does x, y, and z..." questions. If your question was closed as a duplicate of this question and you feel that the information provided here does not provide a sufficient answer, please open a discussion on Pro Webmasters Meta. I have a list of features that I want for my website's Content Management System (CMS) - where can I find a [free] script that includes all of them?

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• Redirect subdomain to local pc

  - by user1188570

  I have a home webserver which is constatly running. Is it possible to create a subdomain which would redirect traffic to another local pc? For example I have 1 Server and one notebook(with webserver installed for developing) Now I can access to notebook only from local network with IP. Server is also hosting domain example.com. Now I would like to visit laptop.example.com, which would be my laptop.

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• how do I run CafeOBJ on my Ubuntu OS?

  - by Imogen

  I am attempting to run CafeOBJ on my ubuntu 12.04 OS. It wont open, when I try to run this on my other windows 7 OS i get a LIBEAY error message. What do I do to run this program that used to run fine on the windows OS. I have installed correctly and all files are present, but the cafeOBJ application is not considered an application by the laptop. In summation I am having LOADS of fun screaming at my laptop to try to make it understand. Please some one help!!!

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• Multiple Denial of Service (DoS) vulnerabilities in libxml2

  - by chandan

  CVE DescriptionCVSSv2 Base ScoreComponentProduct and Resolution CVE-2011-3905 Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability 5.0 libxml2 Solaris 11 Contact Support Solaris 10 SPARC: 125731-07 X86: 125732-07 Solaris 9 Contact Support CVE-2011-3919 Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability 7.5 This notification describes vulnerabilities fixed in third-party components that are included in Sun's product distribution.Information about vulnerabilities affecting Oracle Sun products can be found on Oracle Critical Patch Updates and Security Alerts page.

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• Exadata X3 launch webcast - Available on-demand

  - by Javier Puerta

  Available on-demand, this webcast covers everything partners need to know about Oracle’s next-generation database machine. You will learn how to improve performance by storing multiple databases in memory, lower power and cooling costs by 30%, and easily deploy a cloud based database service. Exadata X3 combines massive memory and low-cost disks to deliver the highest performance at the lowest cost. View here!

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