real-time

问题 Let's say I have Stopwatch running in my code and in the middle, some other application has changed the system clock (I have Domain Time on my server syncing every second). Will it affect the stopwatch result? 回答1: No, internally Stopwatch relies on Win32 QueryPerformanceCounter() which is not tied to the system clock. 回答2: It depends. Stopwatch relies on Win32 QueryPerformanceCounter() only if it is available. This implementation is timechange tolerant. In case high-resolution counters are

问题 What exactly is the Java Real Time Specification? That is, how does it differ from the "regular" Java SE or Java EE specifications? 回答1: At its core, real-time computing is about predictability -- the knowledge that the system will always perform within the required time frame. Basically, this is something you won't be able to achieve with the regular VM (and its stop-the-world GC amongst other things), hence the need for another specification: The Real-Time Specification for Java (RTSJ), or

问题 I need to prevent application's memory pages from being swapped out of RAM on Windows. Is there a WinAPI function equivalent of POSIX mlockall() to achieve that? 回答1: Yes, VirtualLock(). There's a limit on how many pages you can lock, you can't hog RAM. Details are in the MSDN article. 回答2: I have to ask, why do you need to do this? If every app thought its pages were so important that they shouldn't be paged out ever, it would be a giant waste of memory. If the pages are in use, they won't

问题 I need to prevent application's memory pages from being swapped out of RAM on Windows. Is there a WinAPI function equivalent of POSIX mlockall() to achieve that? 回答1: Yes, VirtualLock(). There's a limit on how many pages you can lock, you can't hog RAM. Details are in the MSDN article. 回答2: I have to ask, why do you need to do this? If every app thought its pages were so important that they shouldn't be paged out ever, it would be a giant waste of memory. If the pages are in use, they won't

问题 Brief Description : Well, since many days I've been looking for an answer to this question but there seems to be answers for 'How to create a Push Notification Server' and like questions. I am using node.js and it's quite easy to 'create' a push notification server using sock.js (I've heard socket.io isn't good as compared to sock.js). No problem till here. But what I want is how to model such a server. Details : OK, so, let's say I've an application where there's a chat service (just an

问题 I am newbie in Python and given a task from my boss to do this : Grab streaming data from twitter connect with pycurl and output in JSON Parsing using NLTK and Regular Expression Save it to database file(mySQL) or file base(txt) Note : this is the url that i want to grab ('http://search.twitter.com/search.json?geocode=-0.789275%2C113.921327%2C1.0km&q=+near%3Aindonesia+within%3A1km&result_type=recent&rpp=10') Is there anyone know how to grab a streaming data from twitter using the step above ?

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . Is that possible to get realtime update for specific fan page? I can get from user as long as it is allowed my apps. But how about fans? Can send me some related documentation. If cannot, any optional I can use? 回答1: You need to create a Page and an App. Then the Page adds that App as a tab. Then you subscribe

问题 How to get real-time output from php as it happens ? without storing all in memory/buffer and echoing all at once to the browser ? if i create a realtime-echo.php <?php for($i = 0; $i < 10; $i++) { echo $i; sleep(1); } and access it from Internet browser it gives following output , after 9-10 seconds. 0123456789 but what i am willing the output to be is, when i access the php file from my browser it should give 0 then wait 1 second then add "1" after the "0" then wait 1 second then add "2"

问题 I read that RSS and ATOM are HTTP-based using XML format. So how an RSS or Atom reader get informed about content updates if HTTP doesn't support connections? Do they need to poll the server periodically? I'm interested in using it in a real time web application but I heard that "polling doesn't scale". 回答1: This is pretty similar to this question. Please read my answer there. There is no currently long polling for RSS feeds. The technology you're looking for is PubSubHubbub : it will allow

问题 The code below demonstrates the problem unequivocally , which is: The exact same block of code becomes slower after a busy spin pause. Note that of course I'm not using Thread.sleep . Also note that there are no conditionals leading to a HotSpot/JIT de-optimization as I'm changing the pause using a math operation, not an IF . There is a block of math operations that I want to time. First I time the block pausing 1 nanosecond before I start my measurement. I do that 20,000 times. Then I change