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  • java virtual machine - how does it allocate resources?

    - by Will
    I am testing the performance of a data streaming system that supports continuous queries. This is how it works: - There is a polling service which sends data to my system. - As data passes into the system, each query evaluates based on a window of the stream at the current time. - The window slides as data passes in. My problem is this, when I add more queries to the system, I should expect the throughput to decrease because it can't cope the data rate. However, I actually observe an increase in throughput. I can't understand why this is the case and I am guessing that it's something to do with the way the JVM allocates CPU, memory etc. Can anyone shed any light to my problem?

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  • Tabs.url is undefined

    - by Notionwork
    I have no clue what I'm doing wrong here! This should be working I believe. I'm writing a chrome extension and this should get the current tab's url and set the html of #current-tab to the url (for testing purposes). The code successfully gets to the callback, but it says that tab.url is undefined when I put it in an alert box, and it does not put it's value in #current-tab. Here's the code I have: $('#get-tab').click(function(){ chrome.tabs.query({"active" : true}, function(tab){ for (var i = 0; i < tab.length; i++) { alert(tab.url); $('#current-tab').append(tab.url); }; }); });

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  • Guaranteed way to force application running continuously (overriding taskkill, task manager etc.)

    - by Alex
    I have a C# security/monitoring application that I need to have running no matter what. However, I can not remove privileges or restrict access to parts of the OS (Windows). I thought of having a protection service running which monitors continuously if an application is running, and starts it back up when the application is killed somehow, while the application monitors the protection service and starts the service if the service is killed. To my knowledge you can't simultaneously kill multiple processes at the same time. Any better idea to guarantee that an application is always running?

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  • PHP strange issue with memcache

    - by Industrial
    Hi everyone, I am testing out some memcache code here in PHP: 1: $testInstance = new Memcache; $var = @$testInstance->connect('localhost', 11211); echo $var; // Outputs true no matter if the memcached is running or not. 2: $testInstance = new Memcache; $var = @$testInstance->connect('blablabla', 11211); echo $var; // Outputs false Why on earth is this occuring? I am running WinXP in my development environment and I cant see how the localhost version always returns true no matter if the memcached is running or not. Thanks!

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  • I want to prevent people from accessing my php pages directly using .htaccess

    - by asdasdasd
    I have a site that is made up of php pages, but they are served to the user through includes based on what I think they need. if they can guess the name of a php file, they can access those pages. while this is not a security risk at all, i would rather have a way to catch this and redirect them to somewhere else. i really want everything to go through the index page unless it is a file that exists (exeption being for any file ending with .php). I tried this, didnt work: RewriteEngine on RewriteCond %{REQUEST_URI} !(.*\.php$) [NC] RewriteCond %{REQUEST_FILENAME} !-f [NC] RewriteRule .* /n/index.php [NC]

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  • How to set AssemblyInfo.cs based on the tfs project build number?

    - by Ahok Rudraraju
    The project is hosted on a tfs server and I need to access the build number which I assume is automatically generated when ever you build a project. I need to retrieve that build number and display it on the web pages so that QAs and testing people know exactly which build they are working on. I found how to create customize build numbers in the following link: http://msdn.microsoft.com/en-us/library/aa395241(v=vs.100).aspx but it dose not solve my problem as I do not have access to the build definition file. I am looking for some kind of post deployment task which can access the build number or may be generate one and probably write it down to a file, from where I can read it. I don't know if that makes any sense as this is my first time working on .Net

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  • IE7 preventDefault() not working on skip links

    - by josh
    I currently have skip links that jump to the div ids and was using e.preventDefault() to stop the url from changing when jumping to the element but in IE7 and IE8 it doesn't work at all using e.preventDefault() and if I take it out the url changes to the div the anchor tag contains reference to. Is their any fix or way around this? Here is the code $('body').delegate('a.skiplink-accessible-text', 'click', function (e) { //e.preventDefault(); if (!$.browser.msie) { e.preventDefault(); } var jumpTo = $(this).attr('href'); $('body').find(jumpTo).attr('tabindex', - 1).focus(); }); EDIT: heres a little jsbin example for testing purposes http://jsbin.com/welcome/20846/edit

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  • different brainpoolP521r1 parameters for flexiProvider. Why?

    - by user182846
    I am trying to generate ECC public private key pairs using flexiProvider. I have noticed that values for parameters like p and q are different in brainpoolP521r1 of flexiProvider than those which are specified in many sites. Values specified are Q= AADD.... but what I get is Q=8948... Any idea why flexiProvider does not use specified values and whether having different values is affectes security. I am new to ECC. Any help will be greatly appreciated.

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  • Using a database with C#

    - by Mike
    I have been trying to do something that I think would be really easy but have never used C# before and am having trouble with the details. I simple want to use a sql database with Visual C# Express 2008. For testing purposes I have a datagrid on my form that can reflect changes to the db. If i use this: codesTableAdapter.Fill(dataSet1.codes); The datagrid(dataset) will fill with the info from the sql database. If i then do something like this: codesTableAdapter.InsertQuery(txtCode.Text,txtName.Text); codesTableAdapter.Fill(dataSet1.codes); codesTableAdapter.Update(dataSet1); dataSet1.AcceptChanges(); The datagrid reflects the changes but if close the program and go to the database the changes are not there. When I open the program again the changes are not there. I have a feeling this isn't too clear as my understanding here is very low so please let me know what other info is needed. Thanks

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  • Delphi: what are the 8 mystery components on my form?

    - by mawg
    When I iterate of the controls on my form, I see those which I placed there at design time or run time. They are all of type TEdit, Tmemo, TComboBox, etc ... However, there are always exactly eight which I do not recognize. I can skip over them, since they are not of a type which interests me, but I am curios. I am guessing system controls like min/max/close. Their Name property is empty. Is there any way I can determine what type they are (without explicitly testing for every standard component derived from TWinControl) ? I am curious - but not yellow ;-)

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  • Copying just the data from one Database to another

    - by monksy
    I'm not sure if this is the site for this question or not [if so put in the comment or vote to move it] How can I copy only the data from one database to another within the same server on SQL Server 2005? The two databases have the same schema but not the same data. I'm trying to get the data from one database to another. I am not able to restore from a snapshot [that screws over the security settings on the database]. I'm not able to use the import data wizard, because that is trying to copy over schema data as well.

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  • Problem with the row count transform

    - by abkl
    Hi, I currently deployed an SSIS package (Developed on the 2005 version) (developed on my local server) in a pre production environment for testing. I have used the Row count transform to get a count of good/bad records. It works fine on my local system . However when i deploy this on the pre prod server, the row count does not work! (as in it does not recognize the vairbales i have assigned to the relevant transofm - no drop down abvaliable in the variables attribute part. tried deleting and adding a new transoform.. no luck. Strangely this does not work for any of the other packages also present/deployed on the same server (tried this out by dropping an rc tramsform onto an existing package... same problem) Any suggestions? Thanks a tonne

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  • Network license control for a Java application

    - by user1461615
    I have been tasked with providing some form of network license control for a Java application. The app would be stored on a network drive and run from a client machine. The basic idea is that it will be able to work out how many times it is being run concurrently and prevent the N+1th user from running the software where N is the number of concurrent licenses the customer has purchased. Is this possible somehow with a Java application? I implemented a "solution" which relied on multi-cast UDP communication between the running instances of the application but this didn't work because on most networks this kind of communication is blocked by security measures. Is there a better way? I don't even mind if it requires JNI/JNA. N.B. The solution does not have to be that sophisticated or highly secure.

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  • How can I get my app ready for the iPhone 5

    - by RazorSharp
    Apple just announced the iPhone 5 with a 4 inch screen and a 16:9 aspect ratio. Of course, they only give developers two weeks to scramble to update their apps without being able to test. I'd like to update my app for the iPhone 5's new big screen, but there's nothing on Apple's developer site about the iPhone 5 or making your apps ready for a larger screen. It would be a pain to have to write my own logic for testing whether the device is an iPhone 5 and then displaying a custom storyboard file for it. Does anyone know how the new sizing works or if there are any hidden Xcode for this?

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  • Do I put ninject in my project that contains my service layer as well?

    - by chobo2
    Hi I have 3 project files(webui,framework that contains service layers and repos and unit tests). Most of my unit testing will be done in the service layer as this will contain all the business logic. So I will be mocking out the repo. In some cases I will query my a repo from my controller(say I just need all users in the database and I am not doing any business logic for it). So I am thinking that I need to have ninject used in my framework project. Where is the best place to put it so I can use them against my repos in my service layers?

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  • Is there a circular hash function?

    - by Phil H
    Thinking about this question on testing string rotation, I wondered: Is there was such thing as a circular/cyclic hash function? E.g. h(abcdef) = h(bcdefa) = h(cdefab) etc Uses for this include scalable algorithms which can check n strings against each other to see where some are rotations of others. I suppose the essence of the hash is to extract information which is order-specific but not position-specific. Maybe something that finds a deterministic 'first position', rotates to it and hashes the result? It all seems plausible, but slightly beyond my grasp at the moment; it must be out there already...

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  • Persistent Logins

    - by Trido
    I am following this article on creating persistent login cookies with my ASP.NET site: http://msdn.microsoft.com/en-us/library/system.web.security.formsauthentication.encrypt.aspx The issue is that when I navigate to the page, I get the following compiler error: Compiler Error Message: CS1061: 'ASP.administration_login_aspx' does not contain a definition for 'Login_Click' and no extension method 'Login_Click' accepting a first argument of type 'ASP.administration_login_aspx' could be found (are you missing a using directive or an assembly reference?) Can anyone tell me why this is. The error message doesn't really say much and I don't believe I am missing a directive or assembly reference. The code builds without any problems. EDIT: I did not include code because I said I was following that link which includes code. I copy/pasted from the example.

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  • [PHP] What exactly does it mean when $_FILES is empty?

    - by Mike
    I am working on a PHP upload script and when testing my error checks, I attempted to upload a 17MB TIFF file. When I do this the $_FILES array is empty. The script works fine for what I need it to do, which is to upload JPEG files. My solution is to test if $_FILES is empty or not before continuing with the upload script. Can anybody explain why $_FILES is empty when a TIFF is attempted to be uploaded? Is my solution, to check if $_FILES is empty or not, an okay one? Does this have something to do with settings in php.ini?

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  • Submitting GET data with no input field?

    - by Rob
    I've never really thought about this, but it helps with some security of something I'm currently working on. Is it possible to submit GET data without an actual input field, and instead just getting it from the URL? If so, how would I go about doing this? It kind of makes sense that it should be possible, but at the same time it makes no sense at all. Perhaps I've been awake too long and need some rest. But I'd like to finish this project a bit more first, so any help you can offer would be appreciated. Thanks

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  • How to change a label's text after loading a html into a dialog

    - by Salsa
    I am opening a modal dialog by loading a form into it. After loading the form, I want to change it's title and one of it's fields' label. I can change the label's text, but after the function returns, the label's text turns back to it's original one. Is it possible to make this kind of change and if so, how? The HTML: <form action="testing.php" method="POST" id="example-form"> <fieldset> <label for="link" id="link-label"></label> </fieldset> </form> The javascript: $(".bt-example").button().click(function() { $('#example-dialog').load('form.html').dialog('open'); $('.ui-dialog-titlebar').text("THIS WORKS!"); $('#example-form #link-label').text("CHANGES AT FIRST, BUT GOES BLANK LATER"); $('#example-dialog').removeClass('invisible'); });

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  • Structs and pointers

    - by user1763861
    I have a few questions about structs and pointers For this struct: typedef struct tNode_t { char *w; } tNode; How come if I want to change/know the value of *w I need to use t.w = "asdfsd" instead of t->w = "asdfasd"? And I compiled this successfully without having t.w = (char *) malloc(28*sizeof(char)); in my testing code, is there a reason why tt's not needed? Sample main: int main() { tNode t; char w[] = "abcd"; //t.word = (char *) malloc(28*sizeof(char)); t.word = w; printf("%s", t.word); } Thanks.

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  • jquery .append() not working for my html

    - by user1056998
    I have a program which appends an input(type="hidden") using jquery, to an html so that when I click the submit button, it passes the value to a php file and I can process it. However, it seems that the hidden type is not really being appended to the html nor it is being passed to the php file. I already used method="get" to see the values in the address bar and print_r to see the values being catched but there's nothing. To check if my form is actually passing a value, I added a <input type="hidden" name="absent[]" value="testing" /> in the HTML and the value got passed but the ones in the jquery aren't. Here are my files: jquery: $(function(){ $("td").click(function(){ if($(this).hasClass("on")) { alert("Already marked absent"); } else { $(this).addClass("on"); var currentCellText = $(this).text(); var temp = $(this).attr('id'); $("#collect").append("<input type='hidden' name='absent[]' value = '" + temp + "'/>" + currentCellText); alert(temp); } }); $("#clicky").click(function(){ $("td").removeClass("on"); $("#collect").text(''); $("#collect").append("Absentees: <br>") alert(temp); }); }); Here is the html part: <?php session_start(); include 'connectdb.php'; $classID = $_SESSION['csID']; $classQry = "SELECT e.csID, c.subjCode, c.section, b.subj_name, e.studentID, CONCAT(s.lname, ', ' , s.fname)name FROM ENROLLMENT e, CLASS_SCHEDULE c, STUDENT s, SUBJECT b WHERE e.csID = c.csID AND c.csID = '" . $classID . "' AND c.subjCode = b.subjCode AND e.studentID = s.studentID ORDER BY e.sort;"; $doClassQry = mysql_query($classQry); echo "<table id='tableone'>"; while($x = mysql_fetch_array($doClassQry)) { $subject = $x['subj_name']; $subjCode = $x['subjCode']; $section = $x['section']; $studentArr[] = $x['name']; $studentID[] = $x['studentID']; } echo "<thead>"; echo "<tr><th colspan = 7>" . "This is your class: " . $subjCode . " " . $section . " : " . $subject . "</th></tr>"; echo "</thead>"; echo "<tbody>"; echo "<tr>"; for($i = 0; $i < mysql_num_rows($doClassQry); $i++) { if($i % 7 == 0) { echo "</tr><tr><td id = '". $studentID[$i] . " '>" . $studentArr[$i] . "</td>"; } else { echo "<td id = '". $studentID[$i] . " '>" . $studentArr[$i] . "</td>"; } } echo "</tr>"; echo "</tbody>"; echo "</table>"; ?> Here's the html part with the form: <form name="save" action="saveTest.php" method="post"> <div id="submitt"> <input type="hidden" name="absent[]" value="testing"/> <input type="submit" value="submit"/> </div> </form> And here's the php part which processes the form (saveTest.php): <?php $absent = $_POST['absent']; //echo "absnt" . $absent[] . "<br>"; echo count($absent) . "<br>"; //print_r($_POST) . "<br>"; ?>

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  • Accessing local variable doesn't improve performance

    - by NicMagnier
    The short version Why is this code: var index = (Math.floor(y / scale) * img.width + Math.floor(x / scale)) * 4; More performant than this one? var index = Math.floor(ref_index) * 4; The long version This week, the author of Impact js published an article about some rendering issue: http://www.phoboslab.org/log/2012/09/drawing-pixels-is-hard In the article there was the source of a function to scale an image by accessing pixels in the canvas. I wanted to suggest some traditional ways to optimize this kind of code so that the scaling would be shorter at loading time. But after testing it my result was most of the time worst that the original function. Guessing this was the JavaScript engine that was doing some smart optimization I tried to understand a bit more what was going on so I did a bunch of test. But my results are quite confusing and I would need some help to understand what's going on. I have a test page here: http://www.mx981.com/stuff/resize_bench/test.html jsPerf: http://jsperf.com/local-variable-due-to-the-scope-lookup To start the test, click the picture and the results will appear in the console. There are three different versions: The original code: for( var y = 0; y < heightScaled; y++ ) { for( var x = 0; x < widthScaled; x++ ) { var index = (Math.floor(y / scale) * img.width + Math.floor(x / scale)) * 4; var indexScaled = (y * widthScaled + x) * 4; scaledPixels.data[ indexScaled ] = origPixels.data[ index ]; scaledPixels.data[ indexScaled+1 ] = origPixels.data[ index+1 ]; scaledPixels.data[ indexScaled+2 ] = origPixels.data[ index+2 ]; scaledPixels.data[ indexScaled+3 ] = origPixels.data[ index+3 ]; } } jsPerf: http://jsperf.com/so-accessing-local-variable-doesn-t-improve-performance One of my attempt to optimize it: var ref_index = 0; var ref_indexScaled = 0 var ref_step = 1 / scale; for( var y = 0; y < heightScaled; y++ ) { for( var x = 0; x < widthScaled; x++ ) { var index = Math.floor(ref_index) * 4; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+1 ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+2 ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+3 ]; ref_index+= ref_step; } } jsPerf: http://jsperf.com/so-accessing-local-variable-doesn-t-improve-performance The same optimized code but with recalculating the index variable each time (Hybrid) var ref_index = 0; var ref_indexScaled = 0 var ref_step = 1 / scale; for( var y = 0; y < heightScaled; y++ ) { for( var x = 0; x < widthScaled; x++ ) { var index = (Math.floor(y / scale) * img.width + Math.floor(x / scale)) * 4; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+1 ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+2 ]; scaledPixels.data[ ref_indexScaled++ ] = origPixels.data[ index+3 ]; ref_index+= ref_step; } } jsPerf: http://jsperf.com/so-accessing-local-variable-doesn-t-improve-performance The only difference in the two last one is the calculation of the 'index' variable. And to my surprise the optimized version is slower in most browsers (except opera). Results of personal testing (not the jsPerf tests): Opera Original: 8668ms Optimized: 932ms Hybrid: 8696ms Chrome Original: 139ms Optimized: 145ms Hybrid: 136ms Safari Original: 433ms Optimized: 853ms Hybrid: 451ms Firefox Original: 343ms Optimized: 422ms Hybrid: 350ms After digging around, it seems an usual good practice is to access mainly local variable due to the scope lookup. Because The optimized version only call one local variable it should be faster that the Hybrid code which call multiple variable and object in addition to the various operation involved. So why the "optimized" version is slower? I thought that it might be because some JavaScript engine don't optimize the Optimized version because it is not hot enough but after using --trace-opt in chrome, it seems all version are properly compiled by V8. At this point I am a bit clueless and wonder if somebody would know what is going on? I did also some more test cases in this page: http://www.mx981.com/stuff/resize_bench/index.html

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  • functionality of cin in c++

    - by wyatt
    I'm a bit confused by the results of the following function: int main() { string command; while(1) { cin >> command; if(command == "end") return 0; else cout << "Could you repeat the command?" << endl; } return 0; } First of all - the output line ("could you...") repeats once for each individual word in the input (stored in command). So far as I can see, it should only be possible for it to happen once for each instance of the loop. Also, when the line 'if(command == "end")' is changed to 'if(command == "that's all")' it never triggers. A little testing suggested that all of the whitespace was removed from the command. Could someone explain to me what's going on here? Thanks

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  • environment variable .. why is that?

    - by dskim
    Plz understand my poor English :( I'm using visual studio 2010 and i want to coding with DLL files. so I adjusted the system environment Path . like C:~~ but execute file can't find DLL files.. so I moved Dll files to c:windows\system32 . then I can use it.. Why can't that find DLL files..? and I want to know how computer load DLL files by using system environment Path.. Thank you.. ps : path : %OPENCV_DIR%\bin; (absoultely there are DLL files in bin foler (OPENCV_DIR = C:\opencv\build\x86\vc10) and i'm testing Opencv

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