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  • What is the difference between the 'sudo' and 'admin' group?

    - by ændrük
    I noticed that two groups are granted similar-looking permissions in /etc/sudoers: # Members of the admin group may gain root privileges %admin ALL=(ALL) ALL # Allow members of group sudo to execute any command %sudo ALL=(ALL:ALL) ALL My user account with "Administer the system" privileges is in the admin group, and there don't appear to be any users in the sudo group. What are these two groups for?

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  • 5 Steps to Choosing the Right Web Development Partner

    Finding the right web development company for your project can be a daunting task, with development companies becoming smaller and more widespread, even a simple local search may return hundreds of possible providers, so how do you go about choosing the right company, with a degree of confidence they have the rights skills and experience to deliver your project on time and on budget. Step 1: Planning and Searching The simple, yet often missed stage in choosing the right web development provider is planning; create a simple keyword list of all the relevant keywords for your...

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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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  • Disaster Recovery For Small Business

    You may not be a Boy Scout, but the best way to protect your small business is to be prepared. We look at disaster recovery options to help you stay one step ahead of trouble and to sleep better at night.

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  • Disaster Recovery For Small Business

    You may not be a Boy Scout, but the best way to protect your small business is to be prepared. We look at disaster recovery options to help you stay one step ahead of trouble and to sleep better at night.

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  • Ways to Increase Targeted Traffic and Get Your Website Ranked High in Google For Free

    With so many web pages available on the internet you can be forgiven for thinking that there is no way at all that you could get your website ranked on the first page of Google. This however could not be further from the truth and you may be surprised at how easy it is to do this providing that you follow some guidelines and pick the keyword phrases that you wish to rank highly with carefully.

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  • Google I/O Sandbox Case Study: VectorUnit

    Google I/O Sandbox Case Study: VectorUnit We interviewed VectorUnit at the Google I/O Sandbox on May 11, 2011 and they explained to us the benefits of building for the Android Platform. VectorUnit creates console-quality video games for the Android. For more information on Android developers, visit: developers.android.com For more information on VectorUnit, visit vectorunit.com From: GoogleDevelopers Views: 13 0 ratings Time: 01:33 More in Science & Technology

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  • How to Submit Your Website to Search Engines

    If you own an online business or if a large amount of your business is done through your web page, then one of the greatest sources of traffic can be search engines. No amount of press release, newspaper or radio ad, email or newsletter will give you the same results, although, they may be helpful to some degree.

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  • The World of Web Application

    Have you ever browsed through various websites dealing over a variety of subjects and information as well as trade and commerce? There are several functions that are enabled within a site. You may have made a certain payment for an airline ticket online or even an online auction where you made a bid for a certain product.

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  • Supermicro motherboards and systems

    - by jchang
    I used to buy SuperMicro exclusively for my own lab. SuperMicro always had a deep lineup of motherboards with almost every conceivable variation. In particular, they had the maximum memory and IO configuration that is desired for database servers. But from around 2006, I became too lazy to source the additional components necessary to complete the system, and switched to Dell PowerEdge Tower servers. Now, I may reconsider as neither Dell or HP are offering the right combination of PCI-E slots. Nor...(read more)

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  • Even More Maatkit for MySQL

    As MySQL has evolved and added sophisticated and newer features, there are some areas that remain a bit rough around the edges. Maatkit offers a whole slew of tools for doing backup and restore, finding tables, monitoring your database server and many other database administration tasks you may not have even thought of.

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  • Even More Maatkit for MySQL

    As MySQL has evolved and added sophisticated and newer features, there are some areas that remain a bit rough around the edges. Maatkit offers a whole slew of tools for doing backup and restore, finding tables, monitoring your database server and many other database administration tasks you may not have even thought of.

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  • Google I/O Sandbox Case Study: Assistly

    Google I/O Sandbox Case Study: Assistly We interviewed Assistly at the Google I/O Sandbox on May 11, 2011. They explained to us the benefits of building on Google Apps. Assistly is a customer management system that helps companies deliver top-quality customer service. For more information about developing with Google Apps, visit: code.google.com For more information on Assistly, visit: www.assistly.com From: GoogleDevelopers Views: 21 0 ratings Time: 01:29 More in Science & Technology

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  • Why aren't there native Javascript interpreters for Windows/Mac/Linux?

    - by MebAlone
    It seems to me it would be very useful to use Javascript for general server side scripting tasks as it has more or less the same features as Perl and Python. But AFAIK there are no generally available Javascript interpreters for the major machine architectures. I guess the other problem may be lack of libraries but surely these would come if the interpreters were there. Google's V8 maybe could be a starting point. Does anyone think we'll see this soon?

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  • Is this a pattern? Should it be?

    - by Arkadiy
    The following is more of a statement than a question - it describes something that may be a pattern. The question is: is this a known pattern? Or, if it's not, should it be? I've had a situation where I had to iterate over two dissimilar multi-layer data structures and copy information from one to the other. Depending on particular use case, I had around eight different kinds of layers, combined in about eight different combinations: A-B-C B-C A-C D-E A-D-E and so on After a few unsuccessful attempts to factor out the repetition of per-layer iteration code, I realized that the key difficulty in this refactoring was the fact that the bottom level needed access to data gathered at higher levels. To explicitly accommodate this requirement, I introduced IterationContext class with a number of get() and set() methods for accumulating the necessary information. In the end, I had the following class structure: class Iterator { virtual void iterateOver(const Structure &dataStructure1, IterationContext &ctx) const = 0; }; class RecursingIterator : public Iterator { RecursingIterator(const Iterator &below); }; class IterateOverA : public RecursingIterator { virtual void iterateOver(const Structure &dataStructure1, IterationContext &ctx) const { // Iterate over members in dataStructure1 // locate corresponding item in dataStructure2 (passed via context) // and set it in the context // invoke the sub-iterator }; class IterateOverB : public RecursingIterator { virtual void iterateOver(const Structure &dataStructure1, IterationContext &ctx) const { // iterate over members dataStructure2 (form context) // set dataStructure2's item in the context // locate corresponding item in dataStructure2 (passed via context) // invoke the sub-iterator }; void main() { class FinalCopy : public Iterator { virtual void iterateOver(const Structure &dataStructure1, IterationContext &ctx) const { // copy data from structure 1 to structure 2 in the context, // using some data from higher levels as needed } } IterationContext ctx(dateStructure2); IterateOverA(IterateOverB(FinalCopy())).iterate(dataStructure1, ctx); } It so happens that dataStructure1 is a uniform data structure, similar to XML DOM in that respect, while dataStructure2 is a legacy data structure made of various structs and arrays. This allows me to pass dataStructure1 outside of the context for convenience. In general, either side of the iteration or both sides may be passed via context, as convenient. The key situation points are: complicated code that needs to be invoked in "layers", with multiple combinations of layer types possible at the bottom layer, the information from top layers needs to be visible. The key implementation points are: use of context class to access the data from all levels of iteration complicated iteration code encapsulated in implementation of pure virtual function two interfaces - one aware of underlying iterator, one not aware of it. use of const & to simplify the usage syntax.

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  • Waiting For SEO to Take Effect

    To experience the full benefits of SEO, it does not require years. Unless it is practiced incorrectly, of course. When you try to outsmart the web crawlers that major search engines have, then you may really need a lot of time before you finally get your business full operational.

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  • Top 5 SEO Experts Tips For 2010

    The world of internet marketing and online advertising is so dynamic that it may change almost everyday. The change is not just limited to the content but to how the whole system operates. The rules, guidelines or tips that help you in cutting the competition and bringing out the best content to the world in the best possible manner can also change very rapidly.

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  • Graphic Design for Impressive Website Look

    Graphic design can be a boon for your website or curse if done wrongly. Visual pleasure is the strongest asset and quality of any website which makes them a visitor attracting medium. No matter how g... [Author: Alan Smith - Web Design and Development - May 13, 2010]

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