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• Duration of Excessive GC Time in "java.lang.OutOfMemoryError: GC overhead limit exceeded"

  - by jilles de wit

  Occasionally, somewhere between once every 2 days to once every 2 weeks, my application crashes in a seemingly random location in the code with: java.lang.OutOfMemoryError: GC overhead limit exceeded. If I google this error I come to this SO question and that lead me to this piece of sun documentation which expains: The parallel collector will throw an OutOfMemoryError if too much time is being spent in garbage collection: if more than 98% of the total time is spent in garbage collection and less than 2% of the heap is recovered, an OutOfMemoryError will be thrown. This feature is designed to prevent applications from running for an extended period of time while making little or no progress because the heap is too small. If necessary, this feature can be disabled by adding the option -XX:-UseGCOverheadLimit to the command line. Which tells me that my application is apparently spending 98% of the total time in garbage collection to recover only 2% of the heap. But 98% of what time? 98% of the entire two weeks the application has been running? 98% of the last millisecond? I'm trying to determine a best approach to actually solving this issue rather than just using -XX:-UseGCOverheadLimit but I feel a need to better understand the issue I'm solving.

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• Timeout reading verity collection - CF8

  - by Gary

  For a long time now I've been having a problem with using the verity search service bundled with ColdFusion 8. The issue is with timeout errors occurring when perfoming any operation on a collection. It's intermittent, and usually occurs after a few operations have been successfully performed. For instance: If I'm adding records to a collection the first, say 15 records, will go through with no problems, but all subsequent records will timeout until the service is rebooted. I'm on a shared server, Windows 2008, 64bit as far as I know. The error I receive is: "An error occurred while performing an operation in the Search Engine library. Error reading collection information.: com.verity.api.administration.ConfigurationException: java.io.IOException: Read timed out" Having spoken to my hosting company, and after doing some research, it's been suggested that the number of collections on a server may cause this issue. I've reduced the amount of collections I use, and there are currently 39 collections on the server. As I'm on a shared server, I have no control over how many collections other customers use, however I've read that the limit is 128 collections, so I don't see why 39 should cause it to become unusable. The collections aren't big, there's maybe around 5,000 records between all of them. Any ideas?

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• Collection is empty when it arrives on the client

  - by digiduck

  One of my entities has an EntitySet< property with [Composition], [Include] and [Association] attributes. I populate this collection in my domain service but when I check its contents when it is received on the client, the collection is empty. I am using Silverlight 4 RTM as well as RIA Services 1.0 RTM. Any ideas what I am doing wrong? Here is the code on my service side: public class RegionDto { public RegionDto() { Cities = new EntitySet<CityDto>(); } [Key] public int Id { get; set; } public string Name { get; set; } [Include] [Composition] [Association("RegionDto_CityDto", "Id", "RegionId")] public EntitySet<CityDto> Cities { get; set; } } public class CityDto { [Key] public int Id { get; set; } public int RegionId { get; set; } public string Name { get; set; } } [EnableClientAccess()] public class RegionDomainService : LinqToEntitiesDomainService<RegionEntities> { public IEnumerable<RegionDto> GetRegions() { var regions = (ObjectContext.Regions .Select(x => new RegionDto { Id = x.ID, Name = x.Name })).ToList(); foreach (var region in regions) { var cities = (ObjectContext.Cities .Where(x => x.RegionID == region.Id) .Select(x => new CityDto { Id = x.ID, Name = x.Name })).ToList(); foreach (var city in cities) { region.Cities.Add(city); } } // each region's Cities collection is populated at this point // however when the client receives it, the Cities collections are all empty return regions; } }

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• Linq join with an inner collection

  - by bronze

  Hi, I am trying a LINQ to Object query on 2 collections Customer.Orders Branches.Pending.Orders (Collection within a collection) I want to output each branch which is yet to deliver any order of the customer. var match = from order in customer.Orders join branch in Branches on order equals branch.Pending.Orders select branch; This does not work, I get : The type of one of the expressions in the join clause is incorrect. Type inference failed in the call to 'GroupJoin'. From my search, I think this is because Order or collection of Orders does not implement equals. If this query worked, it will still be wrong, as it will return a branch if the customer's and pending orders match exactly. I want a result if any of the order matches. I am learning Linq, and looking for a approach to address such issues, rather than the solution itself. I would have done this in SQL like this; SELECT b.branch_name from Customers c, Branches b, Orders o WHERE c.customer_id = o.customer_id AND o.branch_id = b.branch_id AND c.customer_id = 'my customer' AND o.order_status = 'pending'

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• C# reference collection for storing reference types

  - by ivo s

  I like to implement a collection (something like List<T>) which would hold all my objects that I have created in the entire life span of my application as if its an array of pointers in C++. The idea is that when my process starts I can use a central factory to create all objects and then periodically validate/invalidate their state. Basically I want to make sure that my process only deals with valid instances and I don't re-fetch information I already fetched from the database. So all my objects will basically be in one place - my collection. A cool thing I can do with this is avoid database calls to get data from the database if I already got it (even if I updated it after retrieval its still up-to-date if of course some other process didn't update it but that a different concern). I don't want to be calling new Customer("James Thomas"); again if I initted James Thomas already sometime in the past. Currently I will end up with multiple copies of the same object across the appdomain - some out of sync other in sync and even though I deal with this using timestamp field on the MSSQL server I'd like to keep only one copy per customer in my appdomain (if possible process would be better). I can't use regular collections like List or ArrayList for example because I cannot pass parameters by their real local reference to the their existing Add() methods where I'm creating them using ref so that's not to good I think. So how can this be implemented/can it be implemented at all ? A 'linked list' type of class with all methods working with ref & out params is what I'm thinking now but it may get ugly pretty quickly. Is there another way to implement such collection like RefList<T>.Add(ref T obj)? So bottom line is: I don't want re-create an object if I've already created it before during the entire application life unless I decide to re-create it explicitly (maybe its out-of-date or something so I have to fetch it again from the db). Is there alternatives maybe ?

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• Associating an object with another object for GC clearup

  - by thecoop

  Is there any way of associating an object instance (object A) with a second object (object B) in a generalised way, so that when B gets collected A becomes eligable for collection? The same behaviour that would happen if B had an instance variable pointing to A, but without explicitly changing the class definition of B, and being able to do this in a dynamic way? The same sort of effect could be done by using the Component.Disposed event in a funky way, but I don't want to make B disposable EDIT I'm basically creating a cache of objects that are associated with a single 'root' object, and I don't want the cache to be static, as there can be lots of root objects using different caches, so lots of memory will be used up when a root object is no longer used but the cached objects are still around. So, I want a collection of cached objects to be associated with each 'root' object, without changing the root object definition. Sort of like metadata of an extra object reference attached to each root object instance. That way, each collection will get collected when the root object is collected, and not hang around like they would if a static cache was used.

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• The fastest way to iterate through a collection of objects

  - by Trev

  Hello all, First to give you some background: I have some research code which performs a Monte Carlo simulation, essential what happens is I iterate through a collection of objects, compute a number of vectors from their surface then for each vector I iterate through the collection of objects again to see if the vector hits another object (similar to ray tracing). The pseudo code would look something like this for each object { for a number of vectors { do some computations for each object { check if vector intersects } } } As the number of objects can be quite large and the amount of rays is even larger I thought it would be wise to optimise how I iterate through the collection of objects. I created some test code which tests arrays, lists and vectors and for my first test cases found that vectors iterators were around twice as fast as arrays however when I implemented a vector in my code in was somewhat slower than the array I was using before. So I went back to the test code and increased the complexity of the object function each loop was calling (a dummy function equivalent to 'check if vector intersects') and I found that when the complexity of the function increases the execution time gap between arrays and vectors reduces until eventually the array was quicker. Does anyone know why this occurs? It seems strange that execution time inside the loop should effect the outer loop run time.

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• Pointers, am I doing them correctly? Objective-c/cocoa

  - by Chris

  I have this in my @interface struct track currentTrack; struct track previousTrack; int anInt; Since these are not objects, I do not have to have them like int* anInt right? And if setting non-object values like ints, boolean, etc, I do not have to release the old value right (assuming non-GC environment)? The struct contains objects: typedef struct track { NSString* theId; NSString* title; } *track; Am I doing that correctly? Lastly, I access the struct like this: [currentTrack.title ...]; currentTrack.theId = @"asdf"; //LINE 1 I'm also manually managing the memory (from a setter) for the struct like this: [currentTrack.title autorelease]; currentTrack.title = [newTitle retain]; If I'm understanding the garbage collection correctly, I should be able to ditch that and just set it like LINE 1 (above)? Also with garbage collection, I don't need a dealloc method right? If I use garbage collection does this mean it only runs on OS 10.5+? And any other thing I should know before I switch to garbage collected code? Sorry there are so many questions. Very new to objective-c and desktop programming. Thanks

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• How can I bind a List as ItemSource to ListView in XAML?

  - by Jonas

  I'm learning WPF and would like to have a collection similar to a LinkedList, to where I can add and remove strings. And I want to have a ListView that listen to that collection with databinding. How can I do bind a simple list collection to a ListView in XAML? My idea (not working) is something like this: <Window x:Class="TestApp.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Window.Resources> <LinkedList x:Key="myList"></LinkedList> //Wrong <Window.Resources> <Grid> <ListView Height="100" HorizontalAlignment="Left" Margin="88,134,0,0" Name="listView1" VerticalAlignment="Top" Width="120" ItemsSource="{Binding Source={StaticResource myList}}"/> //Wrong </Grid> </Window> All my code (updated version, not working): <Window x:Class="TestApp.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Grid> <TextBox Height="23" HorizontalAlignment="Left" Margin="12,12,0,0" Name="textBox1" VerticalAlignment="Top" Width="120" /> <Button Content="Button" Height="23" HorizontalAlignment="Right" Margin="0,12,290,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" /> <ListView Height="100" HorizontalAlignment="Left" Margin="88,134,0,0" Name="listView1" VerticalAlignment="Top" Width="120" ItemsSource="{Binding myList}"/> </Grid> </Window> C#-code: namespace TestApp { public partial class MainWindow : Window { ObservableCollection<string> myList = new ObservableCollection<string>(); public MainWindow() { InitializeComponent(); myList.Add("first string"); } private void button1_Click(object sender, RoutedEventArgs e) { myList.Add(textBox1.Text); textBox1.Text = myList.Count+"st"; } } }

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• Binding Listbox item source to a collection of collections in windows phone 7

  - by Tee

  Hi there, I am trying to bind a Listbox ItemSource to a collection of multiple Lists. i.e. List PersonCollection List Person List Collection Now I need to show items from both of these list. In wpf you could use HierarchicalDataTemplate i believe, but not sure how I can do it in windows phone 7. Tried with Blend and it generates the following data template. <DataTemplate x:Key="PersonDataTemplate"> <Grid> <StackPanel Margin="0,0,1,0" Orientation="Vertical" VerticalAlignment="Top"> <TextBlock Margin="0,0,1,0" TextWrapping="Wrap" Text="{Binding Person[0].Name}" d:LayoutOverrides="Width"/> <TextBlock Margin="0,0,1,0" TextWrapping="Wrap" Text="{Binding Collection[0].Total}" d:LayoutOverrides="Width"/> </StackPanel> </Grid> </DataTemplate> Is there another way I can do this? I have tried to set the DataContext of Textbox in DataTemplate to individual arrays but did not seem to work. Cant find anything similar on the net apart from the confirmation that HierarchicalDataTemplate is not supported in Windows Phone 7. I have other ways to do but none elegant.. Thanks in advance. Regards

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• Iterating over member typed collection fails when using untyped reference to generic object

  - by Alexander Pavlov

  Could someone clarify why iterate1() is not accepted by compiler (Java 1.6)? I do not see why iterate2() and iterate3() are much better. This paragraph is added to avoid silly "Your post does not have much context to explain the code sections; please explain your scenario more clearly." protection. import java.util.Collection; import java.util.HashSet; public class Test<T> { public Collection<String> getCollection() { return new HashSet<String>(); } public void iterate1(Test test) { for (String s : test.getCollection()) { // ... } } public void iterate2(Test test) { Collection<String> c = test.getCollection(); for (String s : c) { // ... } } public void iterate3(Test<?> test) { for (String s : test.getCollection()) { // ... } } } Compiler output: $ javac Test.java Test.java:11: incompatible types found : java.lang.Object required: java.lang.String for (String s : test.getCollection()) { ^ Note: Test.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 1 error

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• Ruby on Rails AJAX call affects only the first element in collection

  - by pruett

  I'm iterating over a collection of elements and trying to get AJAX to work properly on a specific element within the collection. I'm nesting a few partials in order to iterate over these items and use a js.erb call like this: $('#favorite_form').html("<%=j render partial: 'shared/unfavorite', locals: { mission: @mission } %>"); This only seems to change the 1st item in the collection even though I could be clicking the 5th item down the list, for example. Question: How can I specify (via .js and AJAX) which element to update? Is this jQuery call not specific enough to the individual element? The code works in regular HTTP requests, so I'm wondering if there is a way to specify the individual element, but I thought that's what partials did :/ Example View ( _favorites.html.erb ) <div id="favorite_form"> <% if you_favorited_this?(current_user, mission) %> <%= render partial: 'shared/unfavorite', locals: { mission: mission } %> <% else %> <%= render partial: 'shared/favorite', locals: { mission: mission } %> <% end %> </div>

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• TFS 2010 : Unable to add Project to a collection

  - by Scott

  This morning I'm trying to setup Team Foundation Server 2010 to demo for my team. As this is just a demo, I thought I would install it on my Windows 7 machine which also serves as my development machine. My development machine uses Visual Studio 2008 Team Suite. I installed Team Explorer 2008 and then reapplied SP1. Finally I installed and setup TFS 2010. TFS by default gave me administrator privileges. I started up Visual Studios, and connected up to the Collection just fine. However, I'm unable to create a new project and get the follow error message: "TF30172: You are trying to create a team project either without required permissions or with an older version of team Explorer. Contact your project admin..." To check to permissions, I used my home computer which is running Visual Studio 2010. On this machine I was able to connect up to the same TFS instance and create a project no problem. So it looks as though it is a team explorer problem, but everywhere on the web people are saying not only am what I'm trying to do possible, but they have done it themselves. What am I missing to add a project to TFS 2010 under Visual Studio 2008?

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• Is a backlink with a duplicate description and title from a news site bad for SEO?

  - by Dejan Pelzel

  I have a blog with over a thousand posts. I have posted some of those to a news aggregator site and included the same preview photo and description that I used for it on my own site and the link to the post on my site. Since the site is mainly videos and images, the description was usually a complete match of 4-6 lines of text. It now looks that I have been affected by panda and since I am not doing any bad stuff, I suspect it might be due to duplicate content. For example, when I search the title of my posts, sometimes my site is not even returned, but the news aggregator site is. Could this be the problem with panda?

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• Can third party content on sub-domains harm the main site's search rankings?

  - by dror

  I have a site that is a "portal" or "directory" for service providers. We opened every service provider's own page on our site, but now we get a lot of applications from those providers that want sites from their own. We want to make a full site for every service provider, but rather put them on sub domain URLs. (They don’t mind, it's OK for them.) So, my site is www.exaple.com Their site will be: provider.example.com Now I have two questions: Can the content on the provider sites harm my site in SEO? If one from those sub domains is punished by Google because the owner does "black hat SEO", how it will affect the rood domain? Can it make the root domain get punished?

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• Should Site Title be Before or After Page Title?

  - by NickAldwin

  Possible Duplicate: Does the order of keywords matter in a page title? Apologies if this is a dupe. I tried searching, but didn't find anything specifically addressing this concern. When creating a large(ish) site, page titles usually reference both the site name and the current page name. However, it seems there are two main conventions: Bob's Awesome Site - Contact Page and Contact Page - Bob's Awesome Site I've looked around, and pages usually use one of the two variants above. Is there any reason to use one over the other? SEO/readability/usability/etc? I've thought about it, and have only come up with: Page first - Differentiates the tab when the browser is crowded with lots of tabs Site first - Immediately see the "parent" site, so to speak; more cohesive experience

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• Should Site Title be Before or After Page Title?

  - by NickAldwin

  Apologies if this is a dupe. I tried searching, but didn't find anything specifically addressing this concern. When creating a large(ish) site, page titles usually reference both the site name and the current page name. However, it seems there are two main conventions: Bob's Awesome Site - Contact Page and Contact Page - Bob's Awesome Site I've looked around, and pages usually use one of the two variants above. Is there any reason to use one over the other? SEO/readability/usability/etc? I've thought about it, and have only come up with: Page first - Differentiates the tab when the browser is crowded with lots of tabs Site first - Immediately see the "parent" site, so to speak; more cohesive experience

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• Performance data collection for short-running, ephemeral servers

  - by ErikA

  We're building a medical image processing software stack, currently hosted on various AWS resources. As part of this application, we have a handful of long-running servers (database, load balancers, web application, etc.). Collecting performance data on those servers is quite simple - my go-to- recipe of Nagios (for monitoring/notifications) and Munin (for collection of performance data and displaying trends) will work just fine. However - as part of this application, we are constantly starting up and terminating compute instances on EC2. In typical usage, these compute instances start up, configure themselves, receive a job from a message queue, and then get to work processing that job, which takes anywhere from 15 minutes to over 8 hours. After job completion, these instances get terminated, never to be heard from again. What is a decent strategy for collecting performance data on these short-lived instances? I don't necessarily need monitoring on them - if they fail for whatever reason, our application will detect this and handle re-starting the job on another instance or raising the flag so an administrator can take a look at things. However, it still would be useful to collect information like CPU (user, idle, iowait, etc.), memory usage, network traffic, disk read/write data, etc. In our internal database, we track the instance ID of the machine that runs each job, and it would be quite helpful to be able to look up performance data for a specific instance ID for troubleshooting and profiling. Munin doesn't seem like a great candidate, as it requires maintaining a list of munin nodes in a text file - far from ideal for an environment with a high amount of churn, and for the short amount of time each node will be running, I'd rather keep the full-resolution data indefinitely than have RRD water down the data over time. In the end, my guess is that this will require a monitoring engine that: uses a database (MySQL, SQLite, etc.) for configuration and data storage exposes an API for adding/removing hosts and services Are there other things I should be thinking about when evaluating options? Perhaps I'm over-thinking this, though, and just ought to run sar at 1-minute intervals on these short-lived instances and collect the sar db files prior to termination.

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• I want to search premier inn by sending a postcode to the site

  - by Mick

  Hi I want to send a postcode from my site to premier inns and return the hotels in the area , does anyone know how I can go about it please ? if there is a method for finding a search string from a site can anybody share please http://www.premierinn.com/en/homeQuickSearch!execute.action+ postcode ??? Any help would be great thanks Mick

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• IIS6 all websites displays another site when using https

  - by Lisa

  I have the following websites set up in iis 6. site1.com site2.com site3.com Accessing site1 is via the address https://site1.com. Accessing site2 and site three should be through http. When I try to access https://site2.com it displays the website of https://site1.com. How can I stop this. I either want an error or rediericting to the http site. Any help would be great.

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• unable to see create virtual directory option when clicked on web site in IIS

  - by Anil Namde

  I have newly installed machine on which i have installed the IIS but each site i am installing request is not reaching to the page however if i give path of html/image file explicitly to access the page it is accessible. Also i am not getting the "Create Virtual Directory" option only create web site option is available. What went wrong ? thanks all

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• Site crawler/spider that tosses results into mysql

  - by ian.evans

  It's been suggested that we use mysql for our site's search as it'd be running on the same server that hosts our web server (nginx) and our db (mysql). Since not all of our pages are created from the database, it's been suggested that we have a crawler that can crawl the site, and toss the page url and data into mysql and have sphinx index on that. Does anyone know of an open source spider that has a mysql storing option out of the box. Thanks.

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• Web Site Serving, Cloud-Computing, oh, my

  - by Frank

  I'm planning a software based service. To give it a bit of context (type of traffic), assume it similar to facebook in nature (with a little GitHub thrown in). I've been trying to understand my different hosting options. I've been using a shared host with GoDaddy for years just fine. I currently host a Wordpress web site there and I've not had any problems. Quite frankly, they've taken good care of me. However, the nature of a shared hosting environment is limited in nature. For example, I can't do anything but host a web site there. For example, I can not run a Mercurial server. Last time I attempted to build a web application with the intention of eventually launching it via GoDaddy, I ran in to all sorts of troubles because it was shared-hosted. Assembly issues, etc. At the time, the cost and time sank my project. (The lack of direct access was also frustrating.) (to be fair to godaddy, this was over 3 years ago) I've been looking at Rackspace or Amazon as a possible cloud solution but it seems to be just processing power and bandwidth (and an OS). From what I understand, I'd need to get Apache and MySQL Working on my own. The way cloud hosting is priced, however, seems appealing. I figure my final option might be to use a virtual private host. I think this would be more flexible than a shared-host site but less scalable than a cloud based server. So, I guess my question is what is an appropriate solution for someone who intends to build a web application service? I figure that I need to establish a hosting environment now rather than later so I can plan to effectively use the environment. I'd prefer to be fairly economical to start out with. I really can't afford to pay $999 (or even $99) while I build up the site and get the core functionality online but at the same time, I'd like to have the selected environment grow as needed. Thank you.

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• Duplicate IIS web site with Web Deploy

  - by gsantovena

  I have a Win2008 server with IIS 7 and I want to duplicate one web site and just change the binding port and the application pool that is using, so I will have 2 web sites (locally or remote) with same configuration but listening on different ports. Is there a way to do this with web deploy tool ir order to deploy locally and remotely this unique web site and change the binding ports in the destination?

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• Test a site with a static subdomain locally

  - by bcmcfc

  How can I test a site that uses one or more static domains for serving images locally? e.g. domain.tld with images servered from static.domain.tld Local working copy of the site on WAMP checked out from SVN: URLs will be pointing at static.domain.tld rather than static.domain.local

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