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  • priority_queue with dynamic priorities

    - by Layne
    Hey, I have a server application which accepts incomming queries and executes them. If there are too many queries they should be queued and if some of the other queries got executed the queued queries should be executed as well. Since I want to pass queries with different priorities I think using a priority_queue would be the best choice. e.g. The amout of the axcepting queries (a) hit the limt and new queries will be stored in the queue. All queries have a priority of 1 (lowest) if some of the queries from (a) get executed the programm will pick the query with the highest priority out of the queue and execute it. Still no problem. Now someone is sending a query with a priority of 5 which gets added to the queue. Since this is the query with the highest priority the application will execute this query as soon as the running queries no longer hit the limit. There might be the worst case that 500 queries with a priority of 1 are queued but wont be executed since someone is always sending queries with a priority of 5 hence these 500 queries will be queued for a looooong time. In order to prevent that I want to increase the prioritiy of all queries which have a lower priority than the query with the higher priority, in this example which have a priority lower than 5. So if the query with a priority of 5 gets pulled out of the queue all other queries with a priority < 5 should be increased by 0.2. This way queries with a low priority wont be queued for ever even if there might be 100 queries with a higher priority. I really hope can help me to solve the problem with the priorities: Since my queries consist of an object I thought something like this might work: class Query { public: Query( std::string p_stQuery ) : stQuery( p_stQuery ) {}; std::string getQuery() const {return stQuery;}; void increasePriority( const float fIncrease ) {fPriority += fIncrease;}; friend bool operator < ( const Query& PriorityFirst, const Query& PriorityNext ) { if( PriorityFirst.fPriority < PriorityNext.fPriority ) { if( PriorityFirst.fStartPriority < PriorityNext.fStartPriority ) { Query qTemp = PriorityFirst; qTemp.increasePriority( INCREASE_RATE ); } return true; } else { return false; } }; private: static const float INCREASE_RATE = 0.2; float fPriority; // current priority float fStartPriority; // initialised priority std::string stQuery; };

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  • What's wrong with my using pdo this way?

    - by user198729
    $sql = "SELECT * FROM table ORDER BY :sort :dir LIMIT :start, :results"; $stmt = $dbh->prepare($sql); $stmt->execute(array( 'sort' => $_GET['sort'], 'dir' => $_GET['dir'], 'start' => $_GET['start'], 'results' => $_GET['results'], ) ); I tried to use prepare to do the job,but $stmt->fetchAll(PDO::FETCH_ASSOC); returns nothing.

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  • Waiting for a subset of threads in a Java ThreadPool

    - by David Semeria
    Let's say I have a thread pool containing X items, and a given task employs Y of these items (where Y is much smaller than X). I want to wait for all of the threads of a given task (Y items) to finish, not the entire thread pool. If the thread pool's execute() method returned a reference to the employed thread I could simply join() to each of these Y threads, but it doesn't. Does anyone know of an elegant way to accomplish this? Thanks.

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  • xdebug profiler output strange results

    - by nic28
    I'm using xdebug to profile some PHP code on Windows and using WinCacheGrind/Webgrind to analyse the output, but I'm getting some strange results. Specifically, the total cumulative time for a single method is greater than 100%! How is it possible that more time is spent executing this function's code and all the functions that it calls than the total time it took to execute the whole script? What am I missing here?

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  • SVN Export while retaining permissions

    - by Jonathan
    Hey all- I have some files in my SVN repository that I would like to have execute permissions. When I check them into the repository with 755 permissions and run an svn export, the resulting files have 644 permissions. There doesn't appear to be an option in "svn export" to retain the permissions. Am I missing something? Thanks- Jonathan

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  • Bind event to a div appearing

    - by AndyC
    Can I create an event so I can execute some javascript whenever an element with a specific ID becomes visible or appears on the page? The element comes from a remote resource (so isn't in MY html code but appears on page load) and I'd like some code to run when it appears (and only if it appears, it may not appear every load). Thanks!

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  • JDBC resulset total rows

    - by Zeeshan
    I am implementing Paging in my application. For this i run a query and get a resultset. Now i want to get total no of records in this resultset for my paging calculation. How can i get ? i dont want to execute a extra sql which gives me total rows

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  • what does select @@identity do?

    - by every_answer_gets_a_point
    i am connecting to a mysql database through excel using odbc what does this line do? Set rs = oConn.Execute("SELECT @@identity", , adCmdText) i am having trouble updating the database: With rs .AddNew ' create a new record ' add values to each field in the record .Fields("datapath") = dpath .Fields("analysistime") = atime .Fields("reporttime") = rtime .Fields("lastcalib") = lcalib .Fields("analystname") = aname .Fields("reportname") = rname .Fields("batchstate") = "bstate" .Fields("instrument") = "NA" .Update ' stores the new record End With it is ONLY updating .Fields("instrument") = "NA", but for all other fields it is putting NULL values

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  • Checking if mysql user exists

    - by sergiogx
    How can I check if a user exists? Im doing an installer for a mysql database, and I need to check if a user exits, if not create user, if yes delete user and create it again. this so i can execute the script without worries. thanks.

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  • Help with simple query - why isn't an index being used?

    - by Randy Minder
    I have the following query: SELECT MAX([LastModifiedTime]) FROM Workflow There are approximately 400M rows in the Workflow table. There is an index on the LastModifiedTime column as follows: CREATE NONCLUSTERED INDEX [IX_Workflow_LastModifiedTime] ON [dbo].[Workflow] ( [LastModifiedTime] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 100) The above query takes 1.5 minutes to execute. Why wouldn't SQL Server use the above index and simply retrieve the last row in the index to get the maximum value? Thanks.

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  • HTTP triggers for Postgres

    - by HeineyBehinds
    I'm trying to write a Postgres trigger such that when a configuration table is updated, a backend component is notified and can handle the change. I know that Oracle has the concept of a web/HTTP trigger, where you can execute an HTTP GET from the Oracle instance itself to a URL that can then handle the request at the application layer. I'm wondering if Postgres (v. 9.0.5) has the same feature, or comes with anything similar (and, subsequently, how to set it up/configure it)?

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  • How do I call an upside down jQuery.slideDown()?

    - by Mark Rogers
    In the web app I'm working on I want to do a little slide up notification, like on twitter or your desktop. jQuery's .slideDown does exactly what I want, but it's upside down. The .slideUp doesn't execute an upside down version of slideDown. Instead it hides stuff, like after your cleaning up an old message you've displayed with slideDown. So what's the simplest code to do an upside down slideDown() in jQuery?

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  • Manually Increasing the Amount of CPU a Java Application Uses

    - by SkylineAddict
    I've just made a program with Eclipse that takes a really long time to execute. It's taking even longer because it's loading my CPU to 25% only (I'm assuming that is because I'm using a quad-core and the program is only using one core). Is there any way to make the program use all 4 cores to max it out? Java is supposed to be natively multi-threaded, so I don't understand why it would only use 25%.

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  • Process.Start to run exe in same folder as application is

    - by Hallgaws
    When I am running myProcess = Process.Start("something.exe") and want to start it using button it doen not find the file - i need to execute it from the same folder where application is how can i do that? Thank you. System could not find this file - but it is there . in the same folder as application. Using Visual Basic 2008 Express

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  • Problem in creating Temporary File in android?

    - by Rajapandian
    Hi, In my MediaPlayer application for streaming Video i am using the following code File temp = File.createTempFile("mediaplayertmp", "dat"); while running it throws exceptions like Parent directory of file in not writable:/sdcard/ mediaplayertmp43912.dat I dont how to handle this problem,and i want to know that when we execute that code means where the file will be created.any one knows the solution means please help with some code.

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  • Why does jquery behave like this

    - by andrei
    $('.box').click(function(){ $(this).find('p').toggle( function () { $(this).css({"color" : "red"}); }, function () { $(this).css({"color" : "black"}); } ); }); if i execute this script the 'p' color will change if i click on the 'p' not on the .box class why ? And how to i make it so that 'p' color changes when i click on the .box div

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  • Is there anyway to "probe" a method in common lisp

    - by Michael Minerva
    My application allows the user to create their own methods indirectly and I later need to refer to these methods. I am wondering if there is a way (for error checking purposes) to test if a method exists without trying to execute it. If I just try and call the method and it doesn't exist this will crash my application.

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