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• Apache with mod_perl eating memory when idle

  - by syneticon-dj

  An Apache webserver running a mod_perl application is exposing abnormal memory usage - after the "day load" ceases, the system's memory is being exhausted by the Apache processes and oom_killer is being invoked. As the load returns the following morning, the memory usage normalizes - probably because Apache workers get recycled periodically if a sufficient number of hits is generated: This is the graph for apache hits per second to correlate: The remaining 2 hits per second throughout the night are induced by HAProxy checks - it runs HEAD http://mydomain.example.com/running HTTP/1.0 requests against the server every half a second with "running" being a static file (i.e. not invoking any perl code). It also seems that disabling these checks remedies the memory usage problem, but obviously cannot be a solution. All of 3 similarly configured servers (behind HAProxy) expose this behavior. The running OS is Ubuntu 10.10, Apache version 2.2.16. This seems to be a memory leak but I have no idea how to start debugging it - any hints?

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• Customising error bars

  - by itid

  Hello I've been told I HAVE TO have custom error bars for an assignment I have to hand in. Okay, I have a scatter graph with twelve points, and the error for each one is different. It's the same plus and minus, but different for each one. The twelve different error values are sitting nicely in a column. I have been told I can reference that column in "custom error bars" simply by indicating the range of values, like F2-F14. However, I get an error message every time. When I open Custom Error Bars, it is set up like this: ={} obviously waiting for a function. The error message says remove the equals sign. How should I enter the value range, please ?

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• Transparent, unicode X terminal not tied to a Desktop Environment?

  - by jamuraa

  I've been looking for this for a while now and I just haven't been able to find one. The last few that I used were: aterm - this one was fast and had good transparency support, but it doesn't support Unicode at all as far as I can tell. The dependency graph is also reasonable. gnome-terminal - was good, and had good transparency support plus unicode, but it pulls in about everything in gnome, and I don't use anything else in gnome. It was also somewhat slow (noticable lag in updating at times) and wouldn't use fonts that I wanted. Eterm - same thing as aterm, good dependencies and transparency but no unicode. Does anyone have suggestions, or will I be stuck with gnome-terminal's dependencies and slowness?

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• Innodb statistics

  - by user64204

  We're running InnoDB as a MySQL engine and using phpMyadmin to administer our database. Under Status - Query statistics, phpMyadmin gives us the following: We would like to know where these figures come from because we would like to create a Munin graph showing the evolution of these statistics over time. When we run the SHOW STATUS; query here is what we get: Innodb_rows_deleted 247555 Innodb_rows_inserted 822911 Innodb_rows_read 694934413 Innodb_rows_updated 15048 As you can see there is a substantial difference although both were taking almost at the same time. Q: Do you know where phpMyadmin gets its values from?

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• Visual indication of network activity

  - by at.

  is there a simple application which can sit on top of a fullscreen game to give me an indicator of when there is a lot of network activity? I can only seem to find system tray apps or programs which work outside of fullscreen games. Preferably something transparent so i can see through it. A little background info: I used to have my PC sitting sideways on my desk so I can see lights from the network card. The lights stopped working a while ago and all I need is a little blinking application to tell me when there is activity. I do not need a detailed graph or bandwidth usage, just activity notification. I've looked everywhere for something, maybe you guys are better at searching than me.

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• Soap client call has slow performance

  - by Alon_A

  OS is Centos 6.2 with PHP 5.3.15. We have a Facebook application that is using PHP soap web services. We sometimes experince slow preformance when connecting to these services, but we cant understand what exacly is causing the problem. We've try to analyse the behavior using the profiling tool Kcachgrind. Here is a call graph from the index.php page that took 21 seconds to load. You can clearly see that calling the soap client is the bottle neck. I've also noticed that exactly before the page finishes to load, this file is being created in our serve's /tmp folder: wsdl-apache-d1032d85dfd16c0d91a6b70facc70e43 These are the permission of /tmp drwxrwxrwt 6 root root 40960 Aug 30 10:39 tmp I know its not the most specific question, but if any one had similar performance issues with soap client, We would love some ideas about what can cause this kind of performance problem, what can we do to investigate more accurately or how to overcome the problem ? Thanks.

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• Excel axis problem

  - by itid

  I am graphing the height above sea level obtained by GPS at 12 measuring stations, which are distributed along a straight line but NOT equidistantly. Excel does a nice job of creating a suitable Y axis. But, it insists on placing the 12 stations equidistantly along the X axis. Consequently, the line graph does not represent the true cross section of the terrain. It is only true at the stations themselves. Surely there must be a way that I can enter the actual distances between the stations into a column, and get Excel to read from that column and space the values accordingly? It is such a basic mapping procedure for geologists and many others. Thanks

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• Android ListView scrolling to top

  - by aandroid

  Hi, I have a ListView with custom rows. When any of these rows is clicked, the ListView's data is regenerated. I'd like the list to scroll back to the top when this happens. I initially tried using setSelection(0) in each row's OnClickListener to achieve this but was unsuccessful (I believe because the ListView loses its scroll position when its data is invalidated - so my call to setSelection is undone. I still don't understand how the ListView decides where to scroll to after invalidation, though). The only working solution I know of was given by Romain Guy here: http://groups.google.com/group/android-developers/browse_thread/thread/127ca57414035301 It involves (View.post)ing the call to _listView.setSelection(0). I found this to perform quite poorly. The newly generated list shows up with it's scroll location unchanged and there is a considerable delay before it scrolls back to the top. Is there any better way to achieve this functionality? Any help would be much appreciated. Thanks!

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• Is SiteCore slow and buggy?

  - by Larsenal

  I've seen plenty of negative comments regarding performance and general bugginess. However, to be fair, most of these look like they were within the v5.3 timeframe. Have they fixed all of those issues in v6.0? Is it an excellent product? Some examples of the complaints: Maybe it’s just a case of user error, but this guy says, “some pages take as much as 20s to render…” Source Here, in the comments, one fellow remaks, “Sitecore backend is incredible slow. Sitecore developement is really pain, it takes from 2 minutes to start sitecore and many many seconds to do small backend operations. They claim to have a quick client, but that is a BIG LIE. All developers in my company really hate sitecore for being so slow.” Source Another search yielded, “Sitecore’s users listed three issues as number one: licensing, the server as a resource hog, and the site’s slow responsiveness.” Source

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• Missing IUSR account on Windows Server 2008 R2 / IIS7.5

  - by Thomas Wright

  Ok, I'm stumped. I've been given the job of installing PHP5.4 on this machine. One of the manual installation steps is to configure the IUSR account to have specific permissions. The problem is, I see the IIS_IUSRS group, but no IUSR account. The only users listed are the Admin user, a Guest account, and a user for the security software. I'm not really the Windows server type, more of a *NIX guy - so this is getting a little frustrating. I've searched everywhere and haven't found a suitable answer, but I have learned a lot about IIS7.5 - so it hasn't been a total waste of time. I've tried several recommendations and found several similar problems, but nothing has worked so far. I've also just tried making the IUSR account myself, but to no avail. If anyone knows how to get this going, I will be ever so grateful.

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• ListView items not clickable with HorizontalScrollView inside

  - by Felix

  I have quite a complicated ListView. Each item looks something like this: > LinearLayout (vertical) > LinearLayout (horizontal) > include (horizontal LinearLayout with two TextViews) > include (ditto) > include (ditto) > TextView > HorizontalScrollView (this guy is my problem) > LinearLayout (horizontal) In my activity, when an item is created (getView() is called) I add dynamic TextViews to the LinearLayout inside the HorizontalScrollView (besides filling the other, simpler stuff out). Amazingly, performance is pretty good. My problem is that when I added the HorizontalScrollView, my list items became unclickable. They don't get the orange background when clicked and they don't fire the OnItemClickedListener I have set up (to do a simple Log.d call). How can I make my list items clickable again?

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• How to change VS2010 Add Reference box filter ?

  - by rook

  I'm getting used to the new IDE (it's vc# express), but the first contact is somewhat confusing. When I open the Add Reference dialog and switch to the .NET tab, a label above the assembly list states: "Filtered to:.NET Framework 4". And it's true - I can reference .NET 4.0 assemblies only plus things like XNA 3.1. However I can't see older assemblies i.e. Managed DirectX libs, which are obviously installed on my computer as there was no trouble with adding a ref to them in vc#08. What is this? How to change the filter? The label is read-only. These sound like dull guy's questions, but I'm out of lack of finding an answer and there is no intuitive solution. Thanks in advance.

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• EJB3 Remote vs Webservices, performances?

  - by HerQuLe

  Hello I'm planning to a webapp where every guy using it would have a client that would run computations on its computer (because these computations can't be done on the server, too much load...), and then send results to the server. I guess there will be lot of people interested in my application and that's why i'm wonder if my architecture is good and if i'll be able to handle thousands of people. I'm planning to expose remote EJB through JNDI with Glassfish server, so 1000 people could use these EJB at the same time (i guess there could be 5-50 requests / second) to retrieve the data needed for local computation, and then to send the results... Is it expensive to expose EJB to many clients? Would it be better to use webservices, rmi, another solution? Would you recommend me another architecture for what i'm going to do?

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• TCPlistener.BeginAcceptSocket - async question

  - by Mirek

  Hi, Some time ago I have payed to a programmer for doing multithread server. In the meantime I have learned C# a bit and now I think I can see the slowndown problem - I was told by that guy that nothing is processed on the main thread (Form) so it cannot be frozen..but it is. But I think that altough BeginAcceptSocket is async operation, but its callback runs on the main thread and if there is locking, thats the reason why the app freezes. Am I right? Thanks this.mTcpListener.BeginAcceptSocket(this.AcceptClient, null); protected void AcceptClient(IAsyncResult ar) { //some locking stuff }

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• issues horizontal scrolling using jQuery.ScrollTo / jQuery.SerialScroll

  - by kapil.israni

  Hi, I am trying to develop auto horizontal scrolling for our website using - jQuery.ScrollTo / jQuery.SerialScroll. I am not sure if this is the best jquery library to do that, but if there's something better, please let me know. Here's the behavior that I want, check out foursquare's "Recent Activity" list. The data that will refresh will come from a ajax request that I make every few seconds using window.setInterval. I am not really a CSS/java script guy so I havent been able to figure out jQuery.SerialScroll. Here's the website - look at the "Live job Feeds" list. Currently the list does refresh the data coming from the ajax call, but I dont see the effect, the animation, in fact I dont even think serialScroll is being used. Right now I am doing a - $('#feed-ticker').prepend(content) to pre-append the newly arrived data. You can do a view source to look at the current code. Any help would be really appreciated. Thanks.

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• Client asked for internet radio on his website

  - by Ali

  Hi guys, I have a freelance job for a php site. The client isn't a tech savy guy he says he would like to have internet radio on his website as well. Now the thing is that when we speak of internet radio what are we actually talking about? My client himself has no idea of what internet radio is aside form listening to streaming mp3s on a flash player embedded on a website. I don't think my client would be ready to set up a radio station or so.. I have to give my client a report on what can and cannot be done. So I'm looking for the simplest solution possible that would pass off as internet radio...

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• Must I call super when I implement -scrollViewDidScroll: of UIScrollViewDelegate in an UITableView?

  - by mystify

  I made a custom UITableView subclass and implemented this: - (void)scrollViewDidScroll:(UIScrollView *)scrollView { // scrolled... } Now, what I think is that UITableView may also love to get this message for some obvious reasons. However, when I don't forward that to super, for some reason, everything still works fine. Must I forward that guy to super? I mean...it's a delegate method implementation, but as far as I'm aware of, this would still override anything implemented in UITableView, or not? Edit: I see...the delegate could be anyone. Never mind about this. BUT: What I have such a thing in a superclass, and make a subclass. How would I even know that the superclass does implement that method and I must forward it to super?

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• issues with horizontal scrolling using jQuery.ScrollTo / jQuery.SerialScroll

  - by kapil.israni

  Hi, I am trying to develop auto horizontal scrolling for our website using - jQuery.ScrollTo / jQuery.SerialScroll. I am not sure if this is the best jquery library to do that, but if there's something better, please let me know. Here's the behavior that I want, check out foursquare's "Recent Activity" list. The data that will refresh will come from a ajax request that I make every few seconds using window.setInterval. I am not really a CSS/java script guy so I havent been able to figure out jQuery.SerialScroll. Here's the website - look at the "Live job Feeds" list. Currently the list does refresh the data coming from the ajax call, but I dont see the effect, the animation, in fact I dont even think serialScroll is being used. Right now I am doing a - $('#feed-ticker').prepend(content) to pre-append the newly arrived data. You can do a view source to look at the current code. Any help would be really appreciated. Thanks.

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• From Java GUI to Java Web

  - by Xorty

  I've been doing quite large application recently with Java - Swing. Now I'd like to move to web. Basically - I am not Microsoft guy, Java is fine with me. I've checked some basics of Java EE framework and decided that my choice will be Spring. I already am familiar with JDBC. Learning Spring is one thing, but working just with GUIs (C++ and Java) means that I have very poor knowledge of web development. Before I start reading tutorials of Spring MVC, what should I know to develop web solutions? I am mainly interested "how to" with graphics ... start from scratch or some nice IDE RAD-like development ? I kind of like f.e. Silverlight and integrating to web or asp.net win forms - allows us 'GUI' people develop faster. So can you please give me some useful advices? Thanx

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• Benefits of programming (doing) versus reading blogs (thinking?)

  - by Xian

  I have come to a conclusion or realization that perhaps many developers I know including myself have a fanatical fascination with reading as many programming and technology blogs or listening to podcasts as humanly possible. I sometimes wonder if this time would be much better spent in actual coding and doing, rather than the incessant thinking and perhaps wondering what the "other guy" is doing? With a very large signal to noise ratio in most blogs and podcasts, is there real benefit in maintaining a huge and constant blog role.. or is this some primal fear or instinct to keep up the pace unless being left behind? Can they simply be relegated to Google search and just-in-time learning? Edit: (There are some amazing answers here and touch a philosophical nerve with me, if you are reading this for the first time, I recommend taking the time reading through the answers below)

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• Visual Studio 2010: adding a service reference to a 2008 generated wsdl

  - by Snake

  Doesn't produce a app.config . In my team there is a guy who has Visual Studio 2008, he created a webservice. Then there is me, adding this webservice to a console project. Adding the service reference goes without problems but no valid app.config is generated. It's just empty <configuration> </configuration> When I disable 'reuse types' in my service reference it works but then I get an ambiguous error. Is this a bug? I found http://stackoverflow.com/questions/2159107/visual-studio-does-not-generate-app-config-content-when-add-service-reference this one, but there is no solution there, so I thought I bump the problem up again. Thanks

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• Recommendations for keeping a build server updated

  - by gareth_bowles

  As a guy who frequently switches between QA, build and operations, I keep running into the issue of what to do about operating system updates on the build server. The dichotomy is the same on Windows, Linux, MacOS or any other o/s that can update itself via the internet: The QA team wants to keep the build server exactly as it is from the beginning of the product release cycle to the end, since installing updates could destabilize the server and means that successive builds aren't made against the same baseline. The ops team wants the software to be deployed on a system with all the latest security patches; this can mean that the software isn't deployed on exactly the same version of the o/s that it was built on. I usually mitigate this by taking release candidate builds and installing them on a test server that has a completely up-to-date o/s, repeating the automated tests that are run on the build server and doing some additional system level testing to make sure everything looks good before deployment. However, this seems inefficient to me; does anyone have a better way ?

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• Drawing and Animating with UIView or CALayer?

  - by Markus

  hello, i am trying to implement a graph which a uiview draws. There are 3 UIViews to animate a left/right slide. The problem is, that i can't cancel the UIView animation. So I replaced the UIViews by CALayer. Now, the question is if CALayer is appicable for this? Is it normal to draw on a CALayer like this? And why is a CALayer so slow when I manipulate the frame properties. CGRect frame = curve.frame; frame.origin.x -= diffX; [curve setFrame:frame]; Is there a alternativ? P.S. I am a german guy. Sorry for mistakes.

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• which ASP.NET hosting site allows listening on different ports than 80 and uses .NET 4?

  - by ijjo

  I'm trying to take advantage of HTML 5 web sockets in .NET and the easiest way appears to be something like what this guy does. I've already tested this myself and it works great, but there are a few problems if I try to deploy this to my hosting site (discountasp.net). Basically, I am not allowed to open up a port on 8080 and listen on it. I then tried to figure out a way to listen on port 80 with IIS as well, but using the HTTPListener, I run into sercurity issues as well. This doesn't seem like it will help since I can't mess with this stuff on the hosting site server either. So to make my life easier, I think I need to find a hosting site that simply allows me to open up a socket on port 8080 and listen on it. Anyone know of one? Or does anyone know of a workaround (besides sniffing all the traffic on port 80)?

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• which asp net hosting site allows to listen on differnt port than 80 and uses .net 4?

  - by ijjo

  i'm trying to take advantage of html 5 web sockets in .NET and the easiest way appears to do something like this guy does: http://www.codeproject.com/KB/webservices/c_sharp_web_socket_server.aspx?msg=3485900#xx3485900xx i've already tested this myself and it works great, but there are a few problems if i try to deploy this to my hosting site (discountasp.net). basically i am not allowed to open up a port on 8080 and listen on it. i then tried to figure out a way to listen non port 80 with IIS as well, but using the HTTPListener runs into sercurity issues as well that doesn't seem like will help since i can't mess with this stuff on the hosting site server either: http://stackoverflow.com/questions/169904/can-i-listen-on-a-port-using-httplistener-or-other-net-code-on-vista-without-r so to make my life easier, i think i need to find a hosting site that simply allows me to open up a socket on port 8080 and listen on it. anyone know of one? or anyone know of a workaround (besides sniffing ALL the traffic on port 80)?

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