plinq

I have a very simple question. Is it possible to use PLINQ with Silverlight 4 since it seems that it doesn't exist in the most commonly referenced assemblies? It is not supported but you can vote for it here: http://dotnet.uservoice.com/forums/4325-silverlight-feature-suggestions/suggestions/310712-plinq-and-tpl?ref=title http://portabletpl.codeplex.com/ PortableTPL is a portable project inspired by the Task Parallel Library. It can be used with .Net 4.0, Silverlight 4.0, XNA 4.0 for XBox 360 and Silverlight for Windows Phone. PortableTPL supports following features: Task Task Task

I've encountered a strange behavior in a .NET application that performs some highly parallel processing on a set of in-memory data. When run on a multi-core processor (IntelCore2 Quad Q6600 2.4GHz) it exhibits non-linear scaling as multiple threads are kicked off to process the data. When run as a non-multithreaded loop on a single core, the process is able to complete approximately 2.4 million computations per second. When run as four threads you would expect four times as much throughput - somewhere in the neighborhood of 9 million computations per second - but alas, no. In practice it only

I'm calling a worker method that calls to the database that then iterates and yield returns values for parallel processing. To prevent it from hammering the database, I have a Thread.Sleep in there to pause the execution to the DB. However, this appears to be blocking executions that are still occurring in the Parallel.ForEach. What is the best way to achieve this to prevent blocking? private void ProcessWorkItems() { _cancellation = new CancellationTokenSource(); _cancellation.Token.Register(() => WorkItemRepository.ResetAbandonedWorkItems()); Task.Factory.StartNew(() => Parallel.ForEach

I'm trying to determine how AsParallel() splits it's 'source', and indeed what is meant by 'source'... For example... public class CSVItem { public DateTime Date { get; set; } public string AccountNumber { get; set; } } List<CSVItem> CSVItemList = new List<CSVItem>(); Then put 500k varying CSVItem's into CSVItemList. Then use: CSVItemList = CSVItemList.AsParallel().OrderBy(x => x.AccountNumber).ThenBy(q => q.Date).ToList(); Will it only split the 'source' (meaning for example 250k records onto each of two threads) onto multiple asynch threads and perform the OrderBy().ThenBy() on each thread

I'm doing like this: entities.AsParallel().ForAll(o => repository.Insert(o)); is this good, am I going to have more performance with this ? No. This one can be faster, as it leverages the paralellism to the SQL, but in the end the SQL has to make a lock for the table (page), as it makes an insert. therefore each paralell request is executed after another again. If you want to make a bulk insert, than make a SP accepting all entries (e.g. a table with SQL 2008.) or do it with Linq2SQL. that would be the correct design solution. Probably not. Each insert would actually take place on a seperate

ParallelEnumerable has a static member AsParallel . If I have an IEnumerable<T> and want to use Parallel.ForEach does that imply that I should always be using AsParallel ? e.g. Are both of these correct (everything else being equal)? without AsParallel : List<string> list = new List<string>(); Parallel.ForEach<string>(GetFileList().Where(file => reader.Match(file)), f => list.Add(f)); or with AsParallel ? List<string> list = new List<string>(); Parallel.ForEach<string>(GetFileList().Where(file => reader.Match(file)).AsParallel(), f => list.Add(f)); It depends on what's being called, they are

I'm still very new to LINQ and PLINQ. I generally just use loops and List.BinarySearch in a lot of cases, but I'm trying to get out of that mindset where I can. public class Staff { // ... public bool Matches(string searchString) { // ... } } Using "normal" LINQ - sorry, I'm unfamiliar with the terminology - I can do the following: var matchedStaff = from s in allStaff where s.Matches(searchString) select s; But I'd like to do this in parallel: var matchedStaff = allStaff.AsParallel().Select(s => s.Matches(searchString)); When I check the type of matchedStaff , it's a list of bool s, which isn