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• Can C++ memory leaks negatively affect CPU usage?

  - by Dan

  Hi all, I have a C++ program that has a pretty terrible memory leak, about 4MB / second. I know where it's coming from and can fix it, but that's not my main problem. My program is taking up a very large amount of CPU usage and it isn't running as fast as I want it to. I have two different threads in the program. One by itself takes ~50% CPU, which is fine, and the other by itself takes ~15% CPU, which is fine. Together however CPU usage is 100% and the program cannot run as fast as it needs to. Can a memory leak by itself cause a problem like this? I know the program will eventually crash due to the leaked memory, but does a memory leak immediately lead to a slower program? By immediately I mean the program is too slow at the very start, not just when the memory footprint is huge. Thanks!

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• How to make CSS/HTML prototyping faster for engineers without strong CSS skills?

  - by rdeshpande

  I've been developing Ruby on Rails applications for some time, and have often found help to develop generate the templates of HTML with accompanying CSS. However, I'd like to make an attempt at doing this myself. Initial experiments leave me feeling like my process is really slow. I'm writing all my Rails code in VIM, which, with accompanying aliases to run the test suite, is pretty fast for me. However, the back-and-forth between browser/VIM to see new changes seems cumbersome - I'm guessing finding an editor with an embedded browser that constantly sees new changes is ideal for this (any suggestions?) So far I've experimented with Blueprint, which at the onset seems like it will save me a ton of time. However, what other tools have helped you do the PSD-HTML/CSS conversion as fast as you can?

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• jQuery - Animation flicker using hover()

  - by Chris

  I have a setup as described in this question which works perfectly. Essentially a drop down menu grows when you move your mouse over it to expose more options. There is, however, a small issue. If you move the mouse outside of the #dropdown div and then back in again quickly it constantly fires the mouseenter and mouseleave events causing a never ending cycle of flickering. How can I get around it? Here is my current jQuery code $("#dropdown").hover(function() { $(this).stop(true,true).fadeTo('fast',1); $("#options").stop(true,true).slideDown(); }, function() { $(this).stop(true,true).fadeTo('fast',0.1); $("#options").stop(true,true).slideUp(); } );

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• How do you overide a class that is called by another class with parent::method

  - by dan.codes

  I am trying to extend Mage_Catalog_Block_Product_View I have it setup in my local directory as its own module and everything works fine, I wasn't getting the results that I wanted. I then saw that another class extended that class as well. The method I am trying to override is the protected function _prepareLayout() This is the function class Mage_Review_Block_Product_View extends Mage_Catalog_Block_Product_View protected function _prepareLayout() { $this-&gt;getLayout()-&gt;createBlock('catalog/breadcrumbs'); $headBlock = $this-&gt;getLayout()-&gt;getBlock('head'); if ($headBlock) { $title = $this-&gt;getProduct()-&gt;getMetaTitle(); if ($title) { $headBlock-&gt;setTitle($title); } $keyword = $this-&gt;getProduct()-&gt;getMetaKeyword(); $currentCategory = Mage::registry('current_category'); if ($keyword) { $headBlock-&gt;setKeywords($keyword); } elseif($currentCategory) { $headBlock-&gt;setKeywords($this-&gt;getProduct()-&gt;getName()); } $description = $this-&gt;getProduct()-&gt;getMetaDescription(); if ($description) { $headBlock-&gt;setDescription( ($description) ); } else { $headBlock-&gt;setDescription( $this-&gt;getProduct()-&gt;getDescription() ); } } return parent::_prepareLayout(); } I am trying to modify it just a bit with the following, keep in mind I know there is a title prefix and suffix but I needed it only for the product page and also I needed to add text to the description. class MyCompany_Catalog_Block_Product_View extends Mage_Catalog_Block_Product_View protected function _prepareLayout() { $storeId = Mage::app()-&gt;getStore()-&gt;getId(); $this-&gt;getLayout()-&gt;createBlock('catalog/breadcrumbs'); $headBlock = $this-&gt;getLayout()-&gt;getBlock('head'); if ($headBlock) { $title = $this-&gt;getProduct()-&gt;getMetaTitle(); if ($title) { if($storeId == 2){ $title = "Pool Supplies Fast - " .$title; $headBlock-&gt;setTitle($title); } $headBlock-&gt;setTitle($title); }else{ $path = Mage::helper('catalog')-&gt;getBreadcrumbPath(); foreach ($path as $name =&gt; $breadcrumb) { $title[] = $breadcrumb['label']; } $newTitle = "Pool Supplies Fast - " . join($this-&gt;getTitleSeparator(), array_reverse($title)); $headBlock-&gt;setTitle($newTitle); } $keyword = $this-&gt;getProduct()-&gt;getMetaKeyword(); $currentCategory = Mage::registry('current_category'); if ($keyword) { $headBlock-&gt;setKeywords($keyword); } elseif($currentCategory) { $headBlock-&gt;setKeywords($this-&gt;getProduct()-&gt;getName()); } $description = $this-&gt;getProduct()-&gt;getMetaDescription(); if ($description) { if($storeId == 2){ $description = "Pool Supplies Fast - ". $this-&gt;getProduct()-&gt;getName() . " - " . $description; $headBlock-&gt;setDescription( ($description) ); }else{ $headBlock-&gt;setDescription( ($description) ); } } else { if($storeId == 2){ $description = "Pool Supplies Fast: ". $this-&gt;getProduct()-&gt;getName() . " - " . $this-&gt;getProduct()-&gt;getDescription(); $headBlock-&gt;setDescription( ($description) ); }else{ $headBlock-&gt;setDescription( $this-&gt;getProduct()-&gt;getDescription() ); } } } return Mage_Catalog_Block_Product_Abstract::_prepareLayout(); } This executs fine but then I notice that the following class Mage_Review_Block_Product_View_List extends which extends Mage_Review_Block_Product_View and that extends Mage_Catalog_Block_Product_View as well. Inside this class they call the _prepareLayout as well and call the parent with parent::_prepareLayout() class Mage_Review_Block_Product_View_List extends Mage_Review_Block_Product_View protected function _prepareLayout() { parent::_prepareLayout(); if ($toolbar = $this-&gt;getLayout()-&gt;getBlock('product_review_list.toolbar')) { $toolbar-&gt;setCollection($this-&gt;getReviewsCollection()); $this-&gt;setChild('toolbar', $toolbar); } return $this; } So obviously this just calls the same class I am extending and runs the function I am overiding but it doesn't get to my class because it is not in my class hierarchy and since it gets called after my class all the stuff in the parent class override what I have set. I'm not sure about the best way to extend this type of class and method, there has to be a good way to do this, I keep finding I am running into issues when trying to overide these prepare methods that are derived from the abstract classes, there seems to be so many classes overriding them and calling parent::method. What is the best way to override these functions?

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• SQL Server pivots? some way to set column names to values within a row

  - by ccsimpson3

  I am building a system of multiple trackers that are going to use a lot of the same columns so there is a table for the trackers, the tracker columns, then a cross reference for which columns go with which tracker, when a user inserts a tracker row the different column values are stored in multiple rows that share the same record id and store both the value and the name of the particular column. I need to find a way to dynamically change the column name of the value to be the column name that is stored in the same row. i.e. id | value | name ------------------ 23 | red | color 23 | fast | speed needs to look like this. id | color | speed ------------------ 23 | red | fast Any help is greatly appreciated, thank you.

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• Syncing large personal school-material -git-repo with things such as casual notes? Rsync, wget and Git -- or some ready tool?

  - by hhh

  My friend wants to store electrically her school -notes and process them fast, with backups. She has over 2GB -size repo already and growing all the time (mostly appended material i.e. more school notes, different formats, pdf, pictures and scanned, some text -files, etc). The goal of my friend is to process fast the notes. I suggested command like this here i.e. "# crontab -e @weekly wget --random-wait -e robots=off -U mozilla -mirror http://VeryLong.com". But I think plugging in Rsync somewhere could make it much better with Git. How would you help my friend to process and store the school -material under Git-version-controlling and still keep the size reasonable? Perhaps related rsync .git directory rsync git big repository Different scope Git/rsync mix for projects with large binaries and text files What's a good way to organize a large collection of personal scripts using git?

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• Getting started with C++ ( the paradigm shift from Python )

  - by orokusaki

  I want to learn C++ so that i can develop C++ Python modules for server-related stuff. I'm a purely dynamic languages developer (Python, PHP, Ruby, etc). I want to learn a fast language, and if I'm going to do this, I'd rather learn a really fast language like C++. Before I even get started though, I understand that suddenly working with static types, a different syntax, and compiling code will be quite the paradigm shift. Is there any advice that a C++ dev who also has dynamic languages experience can give me to me to help me make that shift faster?

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• Stop jQuery animations stacking

  - by Chris

  I have an Options box that hovers in the top right of the webpage. It's opacity is set to 10% so as not to be obstructive to users. When they hover over (mouseenter) it I use jQuery to fade it in and slidedown the content (and the reverse on mouseout). If they do this repeatedly though the animation stacks up and you can sometimes be left in a situation where your mouse is stood still but the box is yo-yoing around. How can I get around this situation? Here is how I currently setup the animations $("#dropdown").mouseenter(function() { $(this).fadeTo('fast',1); $("#options").slideDown(); }); $("#dropdown").mouseleave(function() { $(this).fadeTo('fast',0.1); $("#options").slideUp(); }); Note I am using jQuery only and not any other plugins.

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• jQuery delay doesn't work as expected

  - by Chris

  I have the following jQuery code $("#dropdown").hover(function() { $(this).stop(true,true).fadeTo('fast',1); $("#options").stop(true,true).slideDown(); }, function() { $(this).delay(1000).stop(true,true).fadeTo('fast',0.1); $("#options").delay(1000).stop(true,true).slideUp(); } ); What I expect to happen is when the mouse leaves #dropdown it will wait 1 second before continuing. This is not happening. What I am trying to achieve, in case there is a better way, is to leave the drop down menu visible for a second or two after moving your mouse and I would also like to prevent the events from happening again to prevent artifacts and "funnies" if you were to move the mouse over and out from the div very quickly

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• how to animate a menu item into a large div (window) using jquery's animate?

  - by ijjo

  i'm pretty sure this can be done pretty easily with jquery's animate api, but i'm not good enough to figure it out. what i want to do is this: i have a menu item at the top of the viewport that the user will click on. when the user clicks on it, you'll see something that looks like the div "popping" out of the menu and float to a particular location on the screen. when i say popping i don't mean anything fancy - i just mean it appears to be originating from the menu item and settling somewhere on the screen that i specify. but the important part is that this animation happens really fast. fast enough where you don't have to actually wait for the window to appear, but slow enough so the eye sees the animation start from the menu item and end up at a new location where the window will actually appear, and appear with a specify height and width. hope that all made sense?

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• Server.Transfer - What could be the issue here?

  - by Younes

  We have implemented a website with the ability for the user to post his actioncode. This then will be checked by the code and when the user has a price the website will Server.Transfer him to another page. The strange thing here is that the user information will be submitted to the database and the actioncode can't be used again. Here we go... I have one user in this database that is inserted twice very fast after the first time he was added. This are the timestamps: 2010-04-23 07:54:41.133 2010-04-23 07:54:41.417 The insert statement is only called once from the code and the user gets Server.Transfered to the Price.aspx page where he sees what price he won. How can it be that this happened? I'm guessing the user hitted F5 but then he had to be very very fast... Thx!

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• Filemaker XSL 20sec Query Latency

  - by Ian Wetherbee

  I have an ASP frontend that loads data from a Filemaker database using XSL to perform simple queries. The problem is that the first page load takes 20 seconds +/- 200ms, then the next few page refreshes within a minute of the first request take <200ms, then the cycle starts over again. Each page load makes only 2 XSL queries, and they execute fast after the first page load, so what is causing the delay on the first page load? I have caching turned up with a 100% hit rate, and number of connections at 100. I've tried with XSL database sessions on and off, and session time anywhere from 1 to 60 minutes without any changes. The XSL loads from ASP use a GET request and add a Basic Authorization header to authenticate each time. During fast page requests, the fmserver.exe and fmswpc.exe processes don't even flinch, but during a 20 second holdup I see fmserver jump to 30% CPU and a 3mb I/O read a few seconds into the request, and occasionally fmswpc jump to 60% CPU.

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• Slow first page load on asp.net site

  - by Tabloo Quijico

  Hi, Every now and then (always after a long period of idle-time, e.g. overnight) when I access a site built using asp.net - it takes around 15 seconds to load the page (15 seconds before I see any progress whatsoever, then the page comes up fast). Further pages on that site, or refreshes, are quick as usual - they are also fast on other machines, only the first one seems to take the 'hit'. Page tracing never through anything up (whole cycle was a fraction of a second) So my question is where else should I be looking? Perhaps IIS? Or could it still be my asp.net app and I'm just looking in the wrong place (the trace) for clues? As I don't have much control over the IIS server, anything I can check through asp.net would be more helpful, before I go ask that particular admin. cheers :D

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• the News Feed technique

  - by Rawhi

  I have been read a lot of articles to make a good design for my database so I can get the most recent updates for every single user by executing a - kind of - complex query then I send the data using ajax as a JSON to JS file that makes an appropriate edits for the records. It seems fast but I don't know if it will be as much as fast if the site has a large number of users . so iv'e started looking for an alternatives . and I found something called NodeJS , I really didn't understand what it is stand for and hope that you can help me with that. from another hand if the facebook doesn't use a normal db to do whatever he does , then I think there is no way to do it . helpful link : What's the best manner of implementing a social activity stream? waiting for your comments. best regards

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• jQuery automatic scroll / slideshow

  - by tony noriega

  Could i modify this existing code to automatically scroll through the list items to display the content? Sorry, the: ul li a {} links. Maybe using "interval" method? $(document).ready(function(){ $('ul.tabNav a').click(function() { var curChildIndex = $(this).parent().prevAll().length + 1; $(this).parent().parent().children('.current').removeClass('current'); $(this).parent().addClass('current'); $(this).parent().parent().prev('.tabContainer').children('.current').fadeOut('fast',function() { $(this).parent().children('div:nth-child('+curChildIndex+')').fadeIn('fast',function() { $(this).addClass('current'); }); $(this).removeClass('current'); }); return false; }); });

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• Looking for a source code management system with a good GUI client

  - by Anders Öhrt

  We are currently using CS-RCS Pro for source code management, and are looking for to replace this due to performance issues. It is based on client side file access with no own protocol, which makes it painfully slow to use over a slow VPN line since it always rewrites the whole history of a file. It does however have a GUI client which is very simple and gives a great overview. We have three main requirements in a SCM: Fast. It must have a server side service or some other smart way so working with files with a large history is fast. A good Windows GUI client (not Explorer shell integration, not VS or Eclipse IDE integration), so working with files and branches is easy. The possibility to have several branches checked out at once in different directories. Does anyone have a recommendation of a SCM which fulfills there requirements?

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• Stopping jQuery Jumping to Newly Loaded Content.

  - by Damien

  I have a div with is replaced upon certain user actions. These actions are performed under the div that is being replaced and in the case that the div is too large to fit completely into the view window, along with the buttons used to change it underneath, the browser will jump to the top of the newly loaded div. Which is annoying. Does anyone know of a way to stop these? Cheers. Here is the jQuery code. ChartContent is a small blob of html function UpdateChartImage(ChartContent) { //do updates on div here var existingChart = $("#" + $(ChartContent).attr("id")); existingChart.fadeOut("fast", function() { existingChart.replaceWith(ChartContent); }).fadeIn("fast"); } Incidentally I have prevented the button from doing it's default behaviour so I don't think it's related to that.

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• What is the Fastest Java/PHP Bridge?

  - by The Rook

  A bi-directional communication is required between a Java application and a PHP web app. A Fast and low Resource consumption is the number 1 priority in this project There is the PHP/Java Brdige(PJB) project and there are benchmarks to show that is very fast. Do you know of a faster approach? xml over http strikes me as a bit wasteful, but I don't know of a better approach. Ideally this system would be a remote connection, but due to time constraints it might have to be local. Do you know of a fastest way to accomplish this bi-directional connection?

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• Why are mainframes still around?

  - by ThaDon

  It's a question you've probably asked or been asked several times. What's so great about Mainframes? The answer you've probably been given is "they are fast" "normal computers can't process as many 'transactions' per second as they do". Jeese, I mean it's not like Google is running a bunch of Mainframes and look how many transactions/sec they do! The question here really is "why?". When I ask this question to the mainframe devs I know, they can't answer, they simply restate "It's fast". With the advent of Cloud Computing, I can't imagine mainframes being able to compete both cost-wise and mindshare-wise (aren't all the Cobol devs going to retire at some point, or will offshore just pickup the slack?). And yet, I know a few companies that still pump out net-new Cobol/Mainframe apps, even for things we could do easily in say .NET and Java. Anyone have a real good answer as to why "The Mainframe is faster", or can point me to some good articles relating to the topic?

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• Fastest way to test if php_apc is working properly?

  - by user198729

  I now suspect there is a bug with php_apc,but not sure,is there a fast way to test if it's functioning well?

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• problem with live function

  - by Dirty Bird Design

  I had this working to spec, until the specs changed. This function is now brought in via ajax .load. Easy enough to bring it in and I have all my other functions on the page that is brought in working in the parent page except this one: $("#CME").hide(); $(function() { $("#CME1, #CMEQL, #CBT1, #CBTQL, #NYM1, #CMX1").live("change", function(){ var checkBoxes = $("#CME1, #CMEQL, #CBT1, #CBTQL, #NYM1, #CMX1").filter(":not(:checked)"); if(checkBoxes.length == 0){ $("#CME").slideDown("fast"); } else { $("#CME").slideUp("fast"); } }); the div "#CME" is not hidden and the .live('change', function () { isn't working. I have other similar .live functions that are working and structured the same. How do I bind the initial $(function() with .live and why isn't the .hide() working? });//CME

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• C/C++ - Any good web server library?

  - by Alon

  Are there any open source, fast web server libraries? Thanks.

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• Git: How do I rewind the Master branch on the remote origin

  - by user277260

  I made 5 commits to Master branch when bug hunting on a private project and pushed them to the remote origin (my own private vps). Then I saw that commits 4 and 5 were going to cause trouble elsewhere and I need to undo them, so I checked out commit 3 again, made a new branch "Dev" from that point, and did a few more commits fixing the issue properly. Then I did git reset --hard HEAD~2 on Master to pull it back to the point that I branched Dev. Then I did git merge to fast forward Master back to the end of the Dev branch. So now I have a local repository, with Dev and Master both pointing to the same, up to date version of the project with the latest bug fix. Problem is, when I try to push the project now to the origin, it fails and gives me an error message: ! [rejected] master - master (non-fast forward) error: failed to push some refs to 'myserver...myproject.git' What have I done wrong, and how do I fix it? Thanks

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• Fake Template Engine php

  - by user1464822

  i got an idea for making php template engine fast and user friendly but i'm not sure if it's good or bad. the idea is to create a fake template engine: creating a template editor in control panel that let user see something like this: <html> <head> <title>{title}</title> </head> <body> {content} </body> </html> what the editor actually does is to replace all php code like <?php echo $this->title; ?> to user friendly {title} but it's not really replacing it just in the view when the user save the template the template actually saved as fast pure php template. the question is this a good idea or bad ? your answers is highly appreciated.

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• Why is this consider bad practice? or is it? (ASP.Net)

  - by user318573

  Would this code be considered bad practice: <div id="sidebar"> <% =DisplayMeetings(12) %> </div> This is a snippet of code from the default.aspx of a small web app I have worked on. It works perfectly well, runs very fast, but as always, I am aware of the fact that just because it works, doesn't mean it is OK. Basically, the DisplayMeetings subroutine outputs a bunch of formatted HTML (an unordered list actually), with no formatting, just the requisite html, and then my CSS performs all the necessary formatting. The data for generating the list comes from an SQL server database (the parameter controls how many rows to return) and I am using stored procedures and datareader for fast access. This keeps my front-end extraordinary simple and clean, imho, and lets me do all the work in VB or C# in a separate module. I could of course use a databound repeater (and probably 6 or more other methods) of accomplishing the same thing, but are they any better? Other than loosing the design-time features of VS2010?

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