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  • Integration of aadvark with Gtalk - how does it work

    - by Gublooo
    Hi guys Not sure if anyone has used aadvark but it has a very nice integration with Gtalk. If you have signed up on aadvark - when any question is posted in your area of expertise - there will be nice pop-up in ur gtalk window asking if you are interested in answering - if you say Yes - it will ask you the question and you can answer in that window itself. Is that something they are able to do because Google bought them or does google have an API with which we can integrate it with our application to do something similar. Thanks

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  • String tokens in .NET

    - by julio
    I am writing a app in .NET which will generate random text based on some input. So if I have text like "I love your {lovely|nice|great} dress" I want to choose randomly from lovely/nice/great and use that in text. Any suggestions in C# or VB.NET are welcome.

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  • RAII tutorial for c++

    - by Joe Bloggs
    Hi. I'd like to learn how to use RAII in c++. I think I know what it is, but have no idea how to implement it in my programs. A quick google search did not show any nice tutorials. Does any one have any nice links to teach me RAII?

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  • What's the logical value of "string" in python?

    - by Kamran
    I erroneously wrote this code in python: name = input("what is your name?") if name == "Kamran" or "Samaneh": print("That is a nice name") else: print("You have a boring name ;)") It always prints out "That is a nice name" even when the input is neither "Kamran" nor "Samaneh". Am I correct in saying that it considers "Samaneh" as a true? why? By the way, I already noticed my mistake. The correct form is: if name == "Kamran" or name == "Samaneh":

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  • how to delete lowercase words from a string in python

    - by gaggina
    I'm new in python and I'm having some issues doing a simple thing. I've an array (or list as it's said in pyton) like this: list = [ 'NICE dog' , 'blue FLOWER' , 'GOOD cat' , 'YELLOW caw'] As you see each element of this array contains some words. These words is both lowercase and uppercase. How I can delete from this array each lowercase words? For example I'd like to have as result this list: list = [ 'NICE' , 'FLOWER' , 'GOOD' , 'YELLOW']

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  • Yahoo Weather WebService

    - by Zakaria
    Hi, I'm trying to find a way to get some weather information with Yahoo Weather using Yahoo Query Language. As i'm living in France, in a city called Nice, the following query returns an error: select * from weather.forecast where location='Nice' And as I have the latitude and longitude coordinated, how can I give them to the YQL to return the weather info? Is this service worldwide or just for USA? Thank you, Regards.

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  • Anyone knows from where to get that jQuery tags editor?

    - by Axel
    Hi, Someday i've downloaded a very nice jquery editor but i lost it and i only have a screenshot of it. You just type a tag and press return or space and it's will be inside a nice box, and you can delete it by only pressing the backspace key or the close icon. Please don't suggest me That because it's so poor and the tags are inserted outside the input box. Thanks

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  • gcc c++ command line error-message parser

    - by Autopulated
    Are there any programs for parsing and displaying in a nice format the c++ error messages generated by gcc. I'm really looking for something like less that I can pipe my errors into that will collapse the template parameter lists by default, maybe with some nice highlighting so that my errors are actually readable. (Yes, it's boost's fault I have such incomprehensible errors, in case you were wondering)

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  • Web site backup in PHP?

    - by Pekka
    Does anybody know a clean PHP-based solution that can backup remote web sites using FTP? Must haves: Recursive FTP backups Possible to run through a cron job Easy to configure (easy adding of multiple sites) Local storage of backup files is sufficient Would be nice: Backed up sites are stored as zip files A nice interface to manage things Provides notification when backup has succeeded or failed Does incremental backups Does MySQL Database backups I need this to be PHP (or Perl) based because it's going to be used on shared hosting packages that do not allow usage of the standard GNU/Linux tools available.

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  • Rewrite css/js paths

    - by wooptoo
    So I rewrote my paths to something like: URL/really/nice/paths/ using mod_rewrite rules like this: <IfModule mod_rewrite.c> RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php?url=$1 [PT,L] </IfModule> The question is how could I rewrite the paths for js/css/image files too, so when they are requested with a relative path from URL/really/nice/path/ to be served from URL/scripts/, URL/styles/ and URL/images/ folders instead? Can this be done without using RewriteBase?

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  • How can Perl's print add a newline by default?

    - by Mike
    In Perl most of my print statements take the form print "hello." . "\n"; Is there a nice way to avoid keeping all the pesky "\n"s lying around? I know I could make a new function such as myprint that automatically appends \n, but it would be nice if I could override the existing print.

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  • boost::function function pointer to parameters?

    - by high6
    How does boost::function take a function pointer and get parameters from it? I want wrap a function pointer so that it can be validated before being called. And it would be nice to be able to call it like boost::function is with the () operator and not having to access the function pointer member. Wrapper func; func(5); //Yes :D func.Ptr(5) //Easy to do, but not as nice looking

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  • PHP get all function arguments as $key => $value array?

    - by web lover
    <?php function register_template(){ print_r(func_get_args()); # the result was an array ( [0] => my template [1] => screenshot.png [2] => nice template .. ) } register_template( # unkown number of arguments $name = "my template", $screenshot = "screenshot.png", $description = "nice template .. " ) ?> BUT , I want the result array as $key = $value form , $key represents the parameter name.

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  • HTG Reviews the CODE Keyboard: Old School Construction Meets Modern Amenities

    - by Jason Fitzpatrick
    There’s nothing quite as satisfying as the smooth and crisp action of a well built keyboard. If you’re tired of  mushy keys and cheap feeling keyboards, a well-constructed mechanical keyboard is a welcome respite from the $10 keyboard that came with your computer. Read on as we put the CODE mechanical keyboard through the paces. What is the CODE Keyboard? The CODE keyboard is a collaboration between manufacturer WASD Keyboards and Jeff Atwood of Coding Horror (the guy behind the Stack Exchange network and Discourse forum software). Atwood’s focus was incorporating the best of traditional mechanical keyboards and the best of modern keyboard usability improvements. In his own words: The world is awash in terrible, crappy, no name how-cheap-can-we-make-it keyboards. There are a few dozen better mechanical keyboard options out there. I’ve owned and used at least six different expensive mechanical keyboards, but I wasn’t satisfied with any of them, either: they didn’t have backlighting, were ugly, had terrible design, or were missing basic functions like media keys. That’s why I originally contacted Weyman Kwong of WASD Keyboards way back in early 2012. I told him that the state of keyboards was unacceptable to me as a geek, and I proposed a partnership wherein I was willing to work with him to do whatever it takes to produce a truly great mechanical keyboard. Even the ardent skeptic who questions whether Atwood has indeed created a truly great mechanical keyboard certainly can’t argue with the position he starts from: there are so many agonizingly crappy keyboards out there. Even worse, in our opinion, is that unless you’re a typist of a certain vintage there’s a good chance you’ve never actually typed on a really nice keyboard. Those that didn’t start using computers until the mid-to-late 1990s most likely have always typed on modern mushy-key keyboards and never known the joy of typing on a really responsive and crisp mechanical keyboard. Is our preference for and love of mechanical keyboards shining through here? Good. We’re not even going to try and hide it. So where does the CODE keyboard stack up in pantheon of keyboards? Read on as we walk you through the simple setup and our experience using the CODE. Setting Up the CODE Keyboard Although the setup of the CODE keyboard is essentially plug and play, there are two distinct setup steps that you likely haven’t had to perform on a previous keyboard. Both highlight the degree of care put into the keyboard and the amount of customization available. Inside the box you’ll find the keyboard, a micro USB cable, a USB-to-PS2 adapter, and a tool which you may be unfamiliar with: a key puller. We’ll return to the key puller in a moment. Unlike the majority of keyboards on the market, the cord isn’t permanently affixed to the keyboard. What does this mean for you? Aside from the obvious need to plug it in yourself, it makes it dead simple to repair your own keyboard cord if it gets attacked by a pet, mangled in a mechanism on your desk, or otherwise damaged. It also makes it easy to take advantage of the cable routing channels in on the underside of the keyboard to  route your cable exactly where you want it. While we’re staring at the underside of the keyboard, check out those beefy rubber feet. By peripherals standards they’re huge (and there is six instead of the usual four). Once you plunk the keyboard down where you want it, it might as well be glued down the rubber feet work so well. After you’ve secured the cable and adjusted it to your liking, there is one more task  before plug the keyboard into the computer. On the bottom left-hand side of the keyboard, you’ll find a small recess in the plastic with some dip switches inside: The dip switches are there to switch hardware functions for various operating systems, keyboard layouts, and to enable/disable function keys. By toggling the dip switches you can change the keyboard from QWERTY mode to Dvorak mode and Colemak mode, the two most popular alternative keyboard configurations. You can also use the switches to enable Mac-functionality (for Command/Option keys). One of our favorite little toggles is the SW3 dip switch: you can disable the Caps Lock key; goodbye accidentally pressing Caps when you mean to press Shift. You can review the entire dip switch configuration chart here. The quick-start for Windows users is simple: double check that all the switches are in the off position (as seen in the photo above) and then simply toggle SW6 on to enable the media and backlighting function keys (this turns the menu key on the keyboard into a function key as typically found on laptop keyboards). After adjusting the dip switches to your liking, plug the keyboard into an open USB port on your computer (or into your PS/2 port using the included adapter). Design, Layout, and Backlighting The CODE keyboard comes in two flavors, a traditional 87-key layout (no number pad) and a traditional 104-key layout (number pad on the right hand side). We identify the layout as traditional because, despite some modern trapping and sneaky shortcuts, the actual form factor of the keyboard from the shape of the keys to the spacing and position is as classic as it comes. You won’t have to learn a new keyboard layout and spend weeks conditioning yourself to a smaller than normal backspace key or a PgUp/PgDn pair in an unconventional location. Just because the keyboard is very conventional in layout, however, doesn’t mean you’ll be missing modern amenities like media-control keys. The following additional functions are hidden in the F11, F12, Pause button, and the 2×6 grid formed by the Insert and Delete rows: keyboard illumination brightness, keyboard illumination on/off, mute, and then the typical play/pause, forward/backward, stop, and volume +/- in Insert and Delete rows, respectively. While we weren’t sure what we’d think of the function-key system at first (especially after retiring a Microsoft Sidewinder keyboard with a huge and easily accessible volume knob on it), it took less than a day for us to adapt to using the Fn key, located next to the right Ctrl key, to adjust our media playback on the fly. Keyboard backlighting is a largely hit-or-miss undertaking but the CODE keyboard nails it. Not only does it have pleasant and easily adjustable through-the-keys lighting but the key switches the keys themselves are attached to are mounted to a steel plate with white paint. Enough of the light reflects off the interior cavity of the keys and then diffuses across the white plate to provide nice even illumination in between the keys. Highlighting the steel plate beneath the keys brings us to the actual construction of the keyboard. It’s rock solid. The 87-key model, the one we tested, is 2.0 pounds. The 104-key is nearly a half pound heavier at 2.42 pounds. Between the steel plate, the extra-thick PCB board beneath the steel plate, and the thick ABS plastic housing, the keyboard has very solid feel to it. Combine that heft with the previously mentioned thick rubber feet and you have a tank-like keyboard that won’t budge a millimeter during normal use. Examining The Keys This is the section of the review the hardcore typists and keyboard ninjas have been waiting for. We’ve looked at the layout of the keyboard, we’ve looked at the general construction of it, but what about the actual keys? There are a wide variety of keyboard construction techniques but the vast majority of modern keyboards use a rubber-dome construction. The key is floated in a plastic frame over a rubber membrane that has a little rubber dome for each key. The press of the physical key compresses the rubber dome downwards and a little bit of conductive material on the inside of the dome’s apex connects with the circuit board. Despite the near ubiquity of the design, many people dislike it. The principal complaint is that dome keyboards require a complete compression to register a keystroke; keyboard designers and enthusiasts refer to this as “bottoming out”. In other words, the register the “b” key, you need to completely press that key down. As such it slows you down and requires additional pressure and movement that, over the course of tens of thousands of keystrokes, adds up to a whole lot of wasted time and fatigue. The CODE keyboard features key switches manufactured by Cherry, a company that has manufactured key switches since the 1960s. Specifically the CODE features Cherry MX Clear switches. These switches feature the same classic design of the other Cherry switches (such as the MX Blue and Brown switch lineups) but they are significantly quieter (yes this is a mechanical keyboard, but no, your neighbors won’t think you’re firing off a machine gun) as they lack the audible click found in most Cherry switches. This isn’t to say that they keyboard doesn’t have a nice audible key press sound when the key is fully depressed, but that the key mechanism isn’t doesn’t create a loud click sound when triggered. One of the great features of the Cherry MX clear is a tactile “bump” that indicates the key has been compressed enough to register the stroke. For touch typists the very subtle tactile feedback is a great indicator that you can move on to the next stroke and provides a welcome speed boost. Even if you’re not trying to break any word-per-minute records, that little bump when pressing the key is satisfying. The Cherry key switches, in addition to providing a much more pleasant typing experience, are also significantly more durable than dome-style key switch. Rubber dome switch membrane keyboards are typically rated for 5-10 million contacts whereas the Cherry mechanical switches are rated for 50 million contacts. You’d have to write the next War and Peace  and follow that up with A Tale of Two Cities: Zombie Edition, and then turn around and transcribe them both into a dozen different languages to even begin putting a tiny dent in the lifecycle of this keyboard. So what do the switches look like under the classicly styled keys? You can take a look yourself with the included key puller. Slide the loop between the keys and then gently beneath the key you wish to remove: Wiggle the key puller gently back and forth while exerting a gentle upward pressure to pop the key off; You can repeat the process for every key, if you ever find yourself needing to extract piles of cat hair, Cheeto dust, or other foreign objects from your keyboard. There it is, the naked switch, the source of that wonderful crisp action with the tactile bump on each keystroke. The last feature worthy of a mention is the N-key rollover functionality of the keyboard. This is a feature you simply won’t find on non-mechanical keyboards and even gaming keyboards typically only have any sort of key roller on the high-frequency keys like WASD. So what is N-key rollover and why do you care? On a typical mass-produced rubber-dome keyboard you cannot simultaneously press more than two keys as the third one doesn’t register. PS/2 keyboards allow for unlimited rollover (in other words you can’t out type the keyboard as all of your keystrokes, no matter how fast, will register); if you use the CODE keyboard with the PS/2 adapter you gain this ability. If you don’t use the PS/2 adapter and use the native USB, you still get 6-key rollover (and the CTRL, ALT, and SHIFT don’t count towards the 6) so realistically you still won’t be able to out type the computer as even the more finger twisting keyboard combos and high speed typing will still fall well within the 6-key rollover. The rollover absolutely doesn’t matter if you’re a slow hunt-and-peck typist, but if you’ve read this far into a keyboard review there’s a good chance that you’re a serious typist and that kind of quality construction and high-number key rollover is a fantastic feature.  The Good, The Bad, and the Verdict We’ve put the CODE keyboard through the paces, we’ve played games with it, typed articles with it, left lengthy comments on Reddit, and otherwise used and abused it like we would any other keyboard. The Good: The construction is rock solid. In an emergency, we’re confident we could use the keyboard as a blunt weapon (and then resume using it later in the day with no ill effect on the keyboard). The Cherry switches are an absolute pleasure to type on; the Clear variety found in the CODE keyboard offer a really nice middle-ground between the gun-shot clack of a louder mechanical switch and the quietness of a lesser-quality dome keyboard without sacrificing quality. Touch typists will love the subtle tactile bump feedback. Dip switch system makes it very easy for users on different systems and with different keyboard layout needs to switch between operating system and keyboard layouts. If you’re investing a chunk of change in a keyboard it’s nice to know you can take it with you to a different operating system or “upgrade” it to a new layout if you decide to take up Dvorak-style typing. The backlighting is perfect. You can adjust it from a barely-visible glow to a blazing light-up-the-room brightness. Whatever your intesity preference, the white-coated steel backplate does a great job diffusing the light between the keys. You can easily remove the keys for cleaning (or to rearrange the letters to support a new keyboard layout). The weight of the unit combined with the extra thick rubber feet keep it planted exactly where you place it on the desk. The Bad: While you’re getting your money’s worth, the $150 price tag is a shock when compared to the $20-60 price tags you find on lower-end keyboards. People used to large dedicated media keys independent of the traditional key layout (such as the large buttons and volume controls found on many modern keyboards) might be off put by the Fn-key style media controls on the CODE. The Verdict: The keyboard is clearly and heavily influenced by the needs of serious typists. Whether you’re a programmer, transcriptionist, or just somebody that wants to leave the lengthiest article comments the Internet has ever seen, the CODE keyboard offers a rock solid typing experience. Yes, $150 isn’t pocket change, but the quality of the CODE keyboard is so high and the typing experience is so enjoyable, you’re easily getting ten times the value you’d get out of purchasing a lesser keyboard. Even compared to other mechanical keyboards on the market, like the Das Keyboard, you’re still getting more for your money as other mechanical keyboards don’t come with the lovely-to-type-on Cherry MX Clear switches, back lighting, and hardware-based operating system keyboard layout switching. If it’s in your budget to upgrade your keyboard (especially if you’ve been slogging along with a low-end rubber-dome keyboard) there’s no good reason to not pickup a CODE keyboard. Key animation courtesy of Geekhack.org user Lethal Squirrel.       

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  • .NET Code Evolution

    - by Alois Kraus
    Originally posted on: http://geekswithblogs.net/akraus1/archive/2013/07/24/153504.aspxAt my day job I do look at a lot of code written by other people. Most of the code is quite good and some is even a masterpiece. And there is also code which makes you think WTF… oh it was written by me. Hm not so bad after all. There are many excuses reasons for bad code. Most often it is time pressure followed by not enough ambition (who cares) or insufficient training. Normally I do care about code quality quite a lot which makes me a (perceived) slow worker who does write many tests and refines the code quite a lot because of the design deficiencies. Most of the deficiencies I do find by putting my design under stress while checking for invariants. It does also help a lot to step into the code with a debugger (sometimes also Windbg). I do this much more often when my tests are red. That way I do get a much better understanding what my code really does and not what I think it should be doing. This time I do want to show you how code can evolve over the years with different .NET Framework versions. Once there was  time where .NET 1.1 was new and many C++ programmers did switch over to get rid of not initialized pointers and memory leaks. There were also nice new data structures available such as the Hashtable which is fast lookup table with O(1) time complexity. All was good and much code was written since then. At 2005 a new version of the .NET Framework did arrive which did bring many new things like generics and new data structures. The “old” fashioned way of Hashtable were coming to an end and everyone used the new Dictionary<xx,xx> type instead which was type safe and faster because the object to type conversion (aka boxing) was no longer necessary. I think 95% of all Hashtables and dictionaries use string as key. Often it is convenient to ignore casing to make it easy to look up values which the user did enter. An often followed route is to convert the string to upper case before putting it into the Hashtable. Hashtable Table = new Hashtable(); void Add(string key, string value) { Table.Add(key.ToUpper(), value); } This is valid and working code but it has problems. First we can pass to the Hashtable a custom IEqualityComparer to do the string matching case insensitive. Second we can switch over to the now also old Dictionary type to become a little faster and we can keep the the original keys (not upper cased) in the dictionary. Dictionary<string, string> DictTable = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase); void AddDict(string key, string value) { DictTable.Add(key, value); } Many people do not user the other ctors of Dictionary because they do shy away from the overhead of writing their own comparer. They do not know that .NET has for strings already predefined comparers at hand which you can directly use. Today in the many core area we do use threads all over the place. Sometimes things break in subtle ways but most of the time it is sufficient to place a lock around the offender. Threading has become so mainstream that it may sound weird that in the year 2000 some guy got a huge incentive for the idea to reduce the time to process calibration data from 12 hours to 6 hours by using two threads on a dual core machine. Threading does make it easy to become faster at the expense of correctness. Correct and scalable multithreading can be arbitrarily hard to achieve depending on the problem you are trying to solve. Lets suppose we want to process millions of items with two threads and count the processed items processed by all threads. A typical beginners code might look like this: int Counter; void IJustLearnedToUseThreads() { var t1 = new Thread(ThreadWorkMethod); t1.Start(); var t2 = new Thread(ThreadWorkMethod); t2.Start(); t1.Join(); t2.Join(); if (Counter != 2 * Increments) throw new Exception("Hmm " + Counter + " != " + 2 * Increments); } const int Increments = 10 * 1000 * 1000; void ThreadWorkMethod() { for (int i = 0; i < Increments; i++) { Counter++; } } It does throw an exception with the message e.g. “Hmm 10.222.287 != 20.000.000” and does never finish. The code does fail because the assumption that Counter++ is an atomic operation is wrong. The ++ operator is just a shortcut for Counter = Counter + 1 This does involve reading the counter from a memory location into the CPU, incrementing value on the CPU and writing the new value back to the memory location. When we do look at the generated assembly code we will see only inc dword ptr [ecx+10h] which is only one instruction. Yes it is one instruction but it is not atomic. All modern CPUs have several layers of caches (L1,L2,L3) which try to hide the fact how slow actual main memory accesses are. Since cache is just another word for redundant copy it can happen that one CPU does read a value from main memory into the cache, modifies it and write it back to the main memory. The problem is that at least the L1 cache is not shared between CPUs so it can happen that one CPU does make changes to values which did change in meantime in the main memory. From the exception you can see we did increment the value 20 million times but half of the changes were lost because we did overwrite the already changed value from the other thread. This is a very common case and people do learn to protect their  data with proper locking.   void Intermediate() { var time = Stopwatch.StartNew(); Action acc = ThreadWorkMethod_Intermediate; var ar1 = acc.BeginInvoke(null, null); var ar2 = acc.BeginInvoke(null, null); ar1.AsyncWaitHandle.WaitOne(); ar2.AsyncWaitHandle.WaitOne(); if (Counter != 2 * Increments) throw new Exception(String.Format("Hmm {0:N0} != {1:N0}", Counter, 2 * Increments)); Console.WriteLine("Intermediate did take: {0:F1}s", time.Elapsed.TotalSeconds); } void ThreadWorkMethod_Intermediate() { for (int i = 0; i < Increments; i++) { lock (this) { Counter++; } } } This is better and does use the .NET Threadpool to get rid of manual thread management. It does give the expected result but it can result in deadlocks because you do lock on this. This is in general a bad idea since it can lead to deadlocks when other threads use your class instance as lock object. It is therefore recommended to create a private object as lock object to ensure that nobody else can lock your lock object. When you read more about threading you will read about lock free algorithms. They are nice and can improve performance quite a lot but you need to pay close attention to the CLR memory model. It does make quite weak guarantees in general but it can still work because your CPU architecture does give you more invariants than the CLR memory model. For a simple counter there is an easy lock free alternative present with the Interlocked class in .NET. As a general rule you should not try to write lock free algos since most likely you will fail to get it right on all CPU architectures. void Experienced() { var time = Stopwatch.StartNew(); Task t1 = Task.Factory.StartNew(ThreadWorkMethod_Experienced); Task t2 = Task.Factory.StartNew(ThreadWorkMethod_Experienced); t1.Wait(); t2.Wait(); if (Counter != 2 * Increments) throw new Exception(String.Format("Hmm {0:N0} != {1:N0}", Counter, 2 * Increments)); Console.WriteLine("Experienced did take: {0:F1}s", time.Elapsed.TotalSeconds); } void ThreadWorkMethod_Experienced() { for (int i = 0; i < Increments; i++) { Interlocked.Increment(ref Counter); } } Since time does move forward we do not use threads explicitly anymore but the much nicer Task abstraction which was introduced with .NET 4 at 2010. It is educational to look at the generated assembly code. The Interlocked.Increment method must be called which does wondrous things right? Lets see: lock inc dword ptr [eax] The first thing to note that there is no method call at all. Why? Because the JIT compiler does know very well about CPU intrinsic functions. Atomic operations which do lock the memory bus to prevent other processors to read stale values are such things. Second: This is the same increment call prefixed with a lock instruction. The only reason for the existence of the Interlocked class is that the JIT compiler can compile it to the matching CPU intrinsic functions which can not only increment by one but can also do an add, exchange and a combined compare and exchange operation. But be warned that the correct usage of its methods can be tricky. If you try to be clever and look a the generated IL code and try to reason about its efficiency you will fail. Only the generated machine code counts. Is this the best code we can write? Perhaps. It is nice and clean. But can we make it any faster? Lets see how good we are doing currently. Level Time in s IJustLearnedToUseThreads Flawed Code Intermediate 1,5 (lock) Experienced 0,3 (Interlocked.Increment) Master 0,1 (1,0 for int[2]) That lock free thing is really a nice thing. But if you read more about CPU cache, cache coherency, false sharing you can do even better. int[] Counters = new int[12]; // Cache line size is 64 bytes on my machine with an 8 way associative cache try for yourself e.g. 64 on more modern CPUs void Master() { var time = Stopwatch.StartNew(); Task t1 = Task.Factory.StartNew(ThreadWorkMethod_Master, 0); Task t2 = Task.Factory.StartNew(ThreadWorkMethod_Master, Counters.Length - 1); t1.Wait(); t2.Wait(); Counter = Counters[0] + Counters[Counters.Length - 1]; if (Counter != 2 * Increments) throw new Exception(String.Format("Hmm {0:N0} != {1:N0}", Counter, 2 * Increments)); Console.WriteLine("Master did take: {0:F1}s", time.Elapsed.TotalSeconds); } void ThreadWorkMethod_Master(object number) { int index = (int) number; for (int i = 0; i < Increments; i++) { Counters[index]++; } } The key insight here is to use for each core its own value. But if you simply use simply an integer array of two items, one for each core and add the items at the end you will be much slower than the lock free version (factor 3). Each CPU core has its own cache line size which is something in the range of 16-256 bytes. When you do access a value from one location the CPU does not only fetch one value from main memory but a complete cache line (e.g. 16 bytes). This means that you do not pay for the next 15 bytes when you access them. This can lead to dramatic performance improvements and non obvious code which is faster although it does have many more memory reads than another algorithm. So what have we done here? We have started with correct code but it was lacking knowledge how to use the .NET Base Class Libraries optimally. Then we did try to get fancy and used threads for the first time and failed. Our next try was better but it still had non obvious issues (lock object exposed to the outside). Knowledge has increased further and we have found a lock free version of our counter which is a nice and clean way which is a perfectly valid solution. The last example is only here to show you how you can get most out of threading by paying close attention to your used data structures and CPU cache coherency. Although we are working in a virtual execution environment in a high level language with automatic memory management it does pay off to know the details down to the assembly level. Only if you continue to learn and to dig deeper you can come up with solutions no one else was even considering. I have studied particle physics which does help at the digging deeper part. Have you ever tried to solve Quantum Chromodynamics equations? Compared to that the rest must be easy ;-). Although I am no longer working in the Science field I take pride in discovering non obvious things. This can be a very hard to find bug or a new way to restructure data to make something 10 times faster. Now I need to get some sleep ….

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  • 11gR2 ???:Oracle Cluster Health Monitor(CHM)??

    - by JaneZhang(???)
       Cluster Health Monitor(????CHM)???Oracle?????,?????????????(CPU????SWAP????I/O?????)??????CHM??????????   ??????????????????????Hang?????(Eviction)????????????????,??????CHM????????????????????,????????????? CHM???????????:    11.2.0.2 ?????? Oracle Grid Infrastructure for Linux (???Linux Itanium) ?Solaris (Sparc 64 ? x86-64)    11.2.0.3 ????? Oracle Grid Infrastructure for AIX ? Windows (???Windows Itanium)?    ????,???????????CHM?????(ora.crf)???:    $ crsctl stat res -t -init    --------------------------------------------------------------------------------    NAME           TARGET  STATE        SERVER                   STATE_DETAILS       Cluster Resources ora.crf        ONLINE  ONLINE       rac1 CHM????????:    1). System Monitor Service(osysmond):?????????????,osysmond????????????????cluster logger service,???????????????????CHM?????      $ ps -ef|grep osysmond       root      7984     1  0 Jun05 ?        01:16:14 /u01/app/11.2.0/grid/bin/osysmond.bin    2). Cluster Logger Service(ologgerd):???????,ologgerd ???????(master),???????(standby)??ologgerd???????????????,??????????     ???:     $ ps -ef|grep ologgerd       root      8257     1  0 Jun05 ?        00:38:26 /u01/app/11.2.0/grid/bin/ologgerd -M -d       /u01/app/11.2.0/grid/crf/db/rac2     ???:      $ ps -ef|grep ologgerd       root      8353     1  0 Jun05 ?        00:18:47 /u01/app/11.2.0/grid/bin/ologgerd -m rac2 -r -d /u01/app/11.2.0/grid/crf/db/rac1 CHM Repository:?????????,?????,????Grid Infrastructure home ? ,??1 GB ?????,???????????0.5GB???? ?????OCLUMON??????????????????(??????3????)? ??????????????:     $ oclumon manage -get reppath       CHM Repository Path = /u01/app/11.2.0/grid/crf/db/rac2       Done     $ oclumon manage -get repsize       CHM Repository Size = 68082 <====????       Done     ????:     $ oclumon manage -repos reploc /shared/oracle/chm      ????:     $ oclumon manage -repos resize 68083 <==?3600(??) ? 259200(3?)??      rac1 --> retention check successful      New retention is 68083 and will use 1073750609 bytes of disk space      CRS-9115-Cluster Health Monitor repository size change completed on all nodes.      Done ??CHM???????????:     1. ?????Grid_home/bin/diagcollection.pl:         1). ??,??cluster logger service????:         $ oclumon manage -get master         Master = rac2         2).?root??????rac2???????:         # <Grid_home>/bin/diagcollection.pl -collect -chmos -incidenttime inc_time -incidentduration duration         inc_time?????????????,???MM/DD/YYYY24HH:MM:SS, duration??????????????????         ??:# diagcollection.pl -collect -crshome /u01/app/11.2.0/grid -chmoshome  /u01/app/11.2.0/grid -chmos -incidenttime 06/15/201215:30:00 -incidentduration 00:05       3).????????,CHM?????????chmosData_rac2_20120615_1537.tar.gz?    2. ??????CHM?????????oclumon:        $oclumon dumpnodeview [[-allnodes] | [-n node1 node2] [-last "duration"] | [-s "time_stamp" -e "time_stamp"] [-v] [-warning]] [-h]        -s??????,-e??????        $ oclumon dumpnodeview -allnodes -v -s "2012-06-15 07:40:00" -e "2012-06-15 07:57:00" > /tmp/chm1.txt       $ oclumon dumpnodeview -n node1 node2 node3 -last "12:00:00" >/tmp/chm1.txt       $ oclumon dumpnodeview -allnodes -last "00:15:00" >/tmp/chm1.txt ???/tmp/chm1.txt??????:----------------------------------------Node: rac1 Clock: '06-15-12 07.40.01' SerialNo:168880----------------------------------------SYSTEM:#cpus: 1 cpu: 17.96 cpuq: 5 physmemfree: 32240 physmemtotal: 2065856 mcache: 1064024 swapfree: 3988376 swaptotal: 4192956 ior: 57 iow: 59 ios: 10 swpin: 0 swpout: 0 pgin: 57 pgout: 59 netr: 65.767 netw: 34.871 procs: 183 rtprocs: 10 #fds: 4902 #sysfdlimit: 6815744 #disks: 4 #nics: 3  nicErrors: 0TOP CONSUMERS:topcpu: 'mrtg(32385) 64.70' topprivmem: 'ologgerd(8353) 84068' topshm: 'oracle(8760) 329452' topfd: 'ohasd.bin(6627) 720' topthread: 'crsd.bin(8235) 44'PROCESSES:name: 'mrtg' pid: 32385 #procfdlimit: 65536 cpuusage: 64.70 privmem: 1160 shm: 1584 #fd: 5 #threads: 1 priority: 20 nice: 0name: 'oracle' pid: 32381 #procfdlimit: 65536 cpuusage: 0.29 privmem: 1456 shm: 12444 #fd: 32 #threads: 1 priority: 15 nice: 0...name: 'oracle' pid: 8756 #procfdlimit: 65536 cpuusage: 0.0 privmem: 2892 shm: 24356 #fd: 47 #threads: 1 priority: 16 nice: 0----------------------------------------Node: rac2 Clock: '06-15-12 07.40.02' SerialNo:168878----------------------------------------SYSTEM:#cpus: 1 cpu: 40.72 cpuq: 8 physmemfree: 34072 physmemtotal: 2065856 mcache: 1005636 swapfree: 3991808 swaptotal: 4192956 ior: 54 iow: 104 ios: 11 swpin: 0 swpout: 0 pgin: 54 pgout: 104 netr: 77.817 netw: 33.008 procs: 178 rtprocs: 10 #fds: 4948 #sysfdlimit: 6815744 #disks: 4 #nics: 4  nicErrors: 0TOP CONSUMERS:topcpu: 'orarootagent.bi(8490) 1.59' topprivmem: 'ologgerd(8257) 83108' topshm: 'oracle(8873) 324868' topfd: 'ohasd.bin(6744) 720' topthread: 'crsd.bin(8362) 47'PROCESSES:name: 'oracle' pid: 9040 #procfdlimit: 65536 cpuusage: 0.19 privmem: 6040 shm: 121712 #fd: 33 #threads: 1 priority: 16 nice: 0...  ??CHM?????,???Oracle????:  http://docs.oracle.com/cd/E11882_01/rac.112/e16794/troubleshoot.htm#CWADD92242  Oracle® Clusterware Administration and Deployment Guide  11g Release 2 (11.2)  Part Number E16794-17  ?? My Oracle Support??:  Cluster Health Monitor (CHM) FAQ (Doc ID 1328466.1)

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  • Add Windows 7’s AeroSnap Feature to Vista and XP

    - by Asian Angel
    Are you using Windows Vista or XP and want that Windows 7 AeroSnap goodness on your own system? Then join us as we look at AeroSnap for Windows Vista and XP. Note: Requires .NET Framework 2.0 or higher (link provided at bottom of article). Setup What exactly does AeroSnap do you might ask…here is a quote directly from the website: “AeroSnap is a simple but powerful application that allows you to resize, arrange or maximize your desktop windows with just drag’n'drop. Simply drag a window to a side of your desktop to snap it or drag it to the top to maximize. When you drag it back to the last position, the last window size will be restored.” As soon as you have finished installing AeroSnap and started it for the first time the only item that will be visible is the “System Tray Icon”. Before going any further you should take a moment to view and make any desired adjustments in the “Options”. Note: AeroSnap works with multiple monitors. You may want to have AeroSnap start with Windows each time but the really nice setting to enable here is the “Snap Preview”. If you are using AeroSnap on Vista and have Aero enabled this will really be nice. The second portion may be of interest for those who would like to enable the keyboard shortcut function. One point worth noting about this screen is that the highest number of pixels from the screen’s edge that you can set AeroSnap for is 20 pixels. AeroSnap in Action AeroSnap is extremely easy to use…just grab the top of an app window and drag it to the left, right, or top of your screen. Since we installed this on Windows Vista we made certain to enable the “Snap Preview” in the “Options”.  We started off with dragging our Firefox 3.7 window towards the left…once we got close to the edge of the screen you can see that the left half of the screen temporarily “shaded over”. Note: The “Snap Preview” displays on the left and right movements but not the top movement. Releasing Firefox snapped it right into the “shaded over” part of the screen. The great thing about AeroSnap is that it is really easy to return the app window to it former size…all that you have to do is simply click on and grab the top portion of the app window. Moving Firefox towards the top of our screen and… It quickly snaps into filling the screen. One thing that we did notice is that the window did not “Maximize” as per the function for the button in the upper right corner. Dragging towards the right side now… And snap! Tucked in all nice and neat… You can minimize the app windows to the Taskbar and they will return to their previous “snap area” when “maximized” again. Conclusion If you have been wanting to add Windows 7’s AeroSnap goodness to your Vista and XP systems then you should definitely give this app a try. AeroSnap is very easy to set up and operate… Links Download AeroSnap for Windows Vista & XP Download the .NET Framework Similar Articles Productive Geek Tips Using Windows 7 or Vista System RestoreRoundup: 16 Tweaks to Windows Vista Look & FeelSelect Files using Check Boxes in Windows VistaSpeed up Your Windows Vista Computer with ReadyBoostHow-To Geek Bounty: $103.24(Paid!) for Active Desktop for Vista TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Add a Custom Title in IE using Spybot or Spyware Blaster When You Need to Hail a Taxi in NYC Live Map of Marine Traffic NoSquint Remembers Site Specific Zoom Levels (Firefox) New Firefox release 3.6.3 fixes 1 Critical bug Dark Side of the Moon (8-bit)

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  • Optional Parameters and Named Arguments in C# 4 (and a cool scenario w/ ASP.NET MVC 2)

    - by ScottGu
    [In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu] This is the seventeenth in a series of blog posts I’m doing on the upcoming VS 2010 and .NET 4 release. Today’s post covers two new language feature being added to C# 4.0 – optional parameters and named arguments – as well as a cool way you can take advantage of optional parameters (both in VB and C#) with ASP.NET MVC 2. Optional Parameters in C# 4.0 C# 4.0 now supports using optional parameters with methods, constructors, and indexers (note: VB has supported optional parameters for awhile). Parameters are optional when a default value is specified as part of a declaration.  For example, the method below takes two parameters – a “category” string parameter, and a “pageIndex” integer parameter.  The “pageIndex” parameter has a default value of 0, and as such is an optional parameter: When calling the above method we can explicitly pass two parameters to it: Or we can omit passing the second optional parameter – in which case the default value of 0 will be passed:   Note that VS 2010’s Intellisense indicates when a parameter is optional, as well as what its default value is when statement completion is displayed: Named Arguments and Optional Parameters in C# 4.0 C# 4.0 also now supports the concept of “named arguments”.  This allows you to explicitly name an argument you are passing to a method – instead of just identifying it by argument position.  For example, I could write the code below to explicitly identify the second argument passed to the GetProductsByCategory method by name (making its usage a little more explicit): Named arguments come in very useful when a method supports multiple optional parameters, and you want to specify which arguments you are passing.  For example, below we have a method DoSomething that takes two optional parameters: We could use named arguments to call the above method in any of the below ways: Because both parameters are optional, in cases where only one (or zero) parameters is specified then the default value for any non-specified arguments is passed. ASP.NET MVC 2 and Optional Parameters One nice usage scenario where we can now take advantage of the optional parameter support of VB and C# is with ASP.NET MVC 2’s input binding support to Action methods on Controller classes. For example, consider a scenario where we want to map URLs like “Products/Browse/Beverages” or “Products/Browse/Deserts” to a controller action method.  We could do this by writing a URL routing rule that maps the URLs to a method like so: We could then optionally use a “page” querystring value to indicate whether or not the results displayed by the Browse method should be paged – and if so which page of the results should be displayed.  For example: /Products/Browse/Beverages?page=2. With ASP.NET MVC 1 you would typically handle this scenario by adding a “page” parameter to the action method and make it a nullable int (which means it will be null if the “page” querystring value is not present).  You could then write code like below to convert the nullable int to an int – and assign it a default value if it was not present in the querystring: With ASP.NET MVC 2 you can now take advantage of the optional parameter support in VB and C# to express this behavior more concisely and clearly.  Simply declare the action method parameter as an optional parameter with a default value: C# VB If the “page” value is present in the querystring (e.g. /Products/Browse/Beverages?page=22) then it will be passed to the action method as an integer.  If the “page” value is not in the querystring (e.g. /Products/Browse/Beverages) then the default value of 0 will be passed to the action method.  This makes the code a little more concise and readable. Summary There are a bunch of great new language features coming to both C# and VB with VS 2010.  The above two features (optional parameters and named parameters) are but two of them.  I’ll blog about more in the weeks and months ahead. If you are looking for a good book that summarizes all the language features in C# (including C# 4.0), as well provides a nice summary of the core .NET class libraries, you might also want to check out the newly released C# 4.0 in a Nutshell book from O’Reilly: It does a very nice job of packing a lot of content in an easy to search and find samples format. Hope this helps, Scott

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  • Silverlight Cream for May 13, 2010 -- #861

    - by Dave Campbell
    In this Issue: Sigurd Snørteland, Jeff Prosise, DaveDev, Joe Zhou, Chris Eargle, John Papa(-2-, -3-), and David Anson(-2-). Shoutouts: In with the links I've listed below, Sigurd Snørteland also sent a link to this app he's working on which is actually pretty cool to see: ZuneLight. The code is not yet available. He also has a no-code demo of a Silverlight Media Center Pieter Voloshyn, Luiz Thadeu, and Jhun Iti have a very nice Silverlight image editor up: Thumba From SilverlightCream.com: WP7 - Silverlight on mobile Sigurd Snørteland submitted some links for me that have been translated to English from his blog. I hope the pages come out good because he's got a lot of good stuff on there. This one has a link to a presentation he did, and 4 projects you can load up in the emulator that he's converted to the phone: weather, worldclock, coverflow, and solitaire ... pretty cool... thanks for the links Sigurd! Understanding Page Orientation in Silverlight for Windows Phone Jeff Prosise has a really nice post up on page orientation in WP7 ... what it means to your app, how to detect it, and example code for what to do then... also love a quote by Jeff: "Silverlight for Windows Phone is the hottest thing since color TV" Why you should check out Expression Blend Behaviors when using Silverlight DaveDev has a post up describing Behaviors and why we should use them, plus tons of external links to resources, blogs, videos... all good stuff... Fiddler inspector for WCF Silverlight Polling Duplex and WCF RIA Joe Zhou announces and provides a link to a new Fiddler inspector that understands the framing in Polling Duplex and also raw binary xml and binary SOAP. Windows Phone Controls v0.7 Chris Eargle reports the release of Version 0.7 of the Windows Phone Controls project on CodePlex ... this includes a Pivot Control and a Panorama Control... both very nicely done. Binding to Silverlight ComboBox and Using SelectedValue, SelectedValuePath and DisplayMemberPath John Papa responds to a user question and put up a nice post about binding to a ComboBox and then go from the selected item to some other property ... code included No More Boxes! Exploring the PathListBox (Silverlight TV #25) Silverlight TV 25 went up on Tuesday ... thought it was going to be Thursday?? anyway ... John Papa and Adam Kinney are discussing the PathListBox and looking at some cool demos thereof. Exposing SOAP, OData, and JSON Endpoints for RIA Services (Silverlight TV 26) Since today IS Thursday, we have a new Silverlight TV, number 26, and John Papa is chatting with Deepesh Mohnani of the WCF RIA Services team about exposing all sorts of endpoints... should be something in there for everybody :) Workaround for a Silverlight data binding bug affecting various scenarios - including DataGrid+ContextMenu David Anson details the rabbit-trail he and others on the team followed in response to a problem reported via Twitter where the binding on a DataGrid seemed off by a row(!) ... weird but true, validated, and SL3/4 are bug-for-bug compatible with this too! ... But David wouldn't leave us there.. he also has a workaround. Sharing the code for a simple Silverlight 4 REST-based cloud-oriented file management app for Azure and S3 David Anson had an opportunity to build an app he's wanted to build for a while and shares it with us: Blobstore -- a small, lightweight Silverlight 4 application that acts as a basic front-end for the Windows Azure Simple Data Storage and the Amazon Simple Storage Service (S3) -- and remember I said he shared the source :) Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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  • Revisioning the CeBIT 2011

    - by hechtsuppe
    Hey guys, I am living in the CeBIT's hometown, the beautiful city Hanover. So I am visiting this exhibition since 2002 and I've seen a lot of changes during all this time. But this time, it was the most boring fair I've ever seen. Lets start with the first halls: "The same procedure as every year"- directly behind the entrance are the exhibitioners from far east (China, Taiwan...). In the past, they've shown a lot of nice toys. But this time, they got very serious, the only great gimmick was the motorcycle suitcase for the iPad, I watched the presentation until I reminded myself that I am not owning an iPad and these cases weren't suitable for my BMW motorcycle. So I started looking for the business stuff (I was there for business). I walked deeper in the exhibition area: During the way to the business halls, I came across a hall where I heard a big bass- the gamer's hall I think so I made a quick getaway from there. I saw a lot of teenagers with gaming bags on thier shoulders and I was really confused. I thought 'Damn it is tuesday 11:00 am, the trade fair is opened for public on saturday, why they are here and not at school?'. So the german schools seem to be too easy for students. At the time I was a pupil I visited the CeBIT on saturday! At the business halls: I visited IBM's booth but there were only guys looking like penguins and I weared a white chemise. So nobody was interested in talking to me. At the coffeebar I met a very nice guy from Bangladesh I think he was round about 25, but he told me that he was the first time in germany and he thought that germans are still nazis. I laughed at him and went to DELL. I was really really really interested in client solutions from DELL because I want to get away from our current client manufacturer. At the DELL booth I became recognized and a really nice guy told me where to use which client products. But there were too many people for trying the notebooks so the DELL guy asked for my business card. But I am still waiting for information, dear 'DELL dude'. I went to the Microsoft booth for informing myself about new IT trends. There were nothig new, only a few presentations about the 'new' Windows Live, Windows Phone 7 and 'the allmighty cloud'. But there was a very small presentation corner with the title 'geeks corner'. A guy inside the 'geeks corner' started Visual Studio 2010, I was really agog for the presentation. But then he started talking about Windows Phone 7 and how to program. He began with drag'n drop a textbox and a button on the form. He wrote really basic code and explained the functionality of a textbox- then I stood up and left the room. At the end: Before leaving the fairground, I've visited a few small booths and the big anti-virus program companies. But there was nothing new, I was really disappointed  this year. I've seen only ten exhibition babes and the rest of the week I stood ~3 hours in traffic jams. But I really love the flair in the whole town during this exhibition. The people in the city railways, which are really confused and the people in the pubs. Cheers Vince

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  • IIS not starting: The process cannot access the file because it is being used by another process

    - by Rick Strahl
    Ok, apparently a few people knew about this issue, but it is new to me and has caused me nearly an hour to track down today. What happened is that I’ve been working all day doing some final pre-deployment testing of several tools on my local dev machine. In the process I’ve been starting and stopping several IIS 7 Web sites. At some point I was done and just wanted to start my Default Web Site again and found this  little gem of an error message popping up: The process cannot access the file because it is being used by another process. (Exception from HRESULT: 0x80070020) A lot of headless running around ensued after this, trying to figure out why IIS wouldn’t start. Oddly some sites started right up, others didn’t. I killed INetInfo, all worker processes, tried IISReset a million times and even rebooted – all to no avail. What gives? Skype, you evil Bastard! As it turns out the culprit is – drum roll please - Skype!  What, you may ask, does Skype have to do with IIS and Web Requests? It looks like recent versions of Skype have an option to run over Port 80 and 443 to allow running over corporate firewalls. Which is actually a nice feature that lets Skype work just about anywhere. What’s not so cool is that IIS fails to start up when another application is already using the same port that a Web site is mapped to. In the case of my dev site that’d be port 80 and Skype was hogging it. To fix this issue you can stop Skype from using port 80 and 443 which quickly fixes the problem. Or stop Skype. Duh! To permanently fix the problem in Skype find the option on the Options | Connection tab and uncheck the Use port 80/443 option: Oddly I haven’t run into this problem even though my setup hasn’t changed in quite some time. It appears that it’s bad startup timing that causes this problem to occur. Whatever the circumstance was, Skype somehow ended up starting before IIS.  If Skype is started after IIS has started it will automatically opt for other ports and not use port 80 and so there’s no problem. It’s easy to demonstrate this behavior if you’re looking for it: Stop IIS Stop Skype Start Skype and make a test call Start IIS And voila your error is ready for you! This really shouldn’t be a problem except that it would be really nice if IIS could give a more helpful error message when it can fire up a site because a port is blocked. “The process cannot access a file” is really not a very helpful error message in this scenario… I/O port / file ah what the heck it’s all the same to Windows. Right! I’ve run into this situation quite a bit with other, albeit more obvious applications like running Apache on the local machine for testing and then trying to run an IIS application. Same situation,  although it’s been a while – pre IIS 7 and I think previous versions of IIS actually gave more useful error messages for port blockages and that would be helpful. On the way to figuring this out I ran into some pretty humorous forum posts though with people ragging on why the hell you would be running IIS. Or Skype. The misinformed paranoia police out in full force so to say :-). It’ll be nice to start running IIS Express once Visual Studio 2010 SP1 gets released. Anyway, no surprise that Skype didn’t jump out at me as the culprit right away and I was left fumbling for a while until the Internet came to the rescue. I’m not the first to have found this for sure – I posted a message on Twitter and dozens of people replied they’d run into this before as well. Seems worth mentioning again though – since I’m sure to forget that this happened in a year from now when I hit that same error. Maybe I’ll even find this blog post to remind me…© Rick Strahl, West Wind Technologies, 2005-2011Posted in IIS7  Windows  

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