Parallel EntityFramework
Is it possible to make some work in parallel with entity framework for following example? using (var dbContext = new DB()) { var res = (from c in dbContext.Customers orderby c.Name select new { c.Id, c.Name, c.Role ...
parallel
Can a Perl subroutine return data but keep processing?
Is there any way to have a subroutine send data back while still processing? For instance (this example used simply to illustrate) - a subroutine reads a file. While it is reading through the file, if some condition is met, then "return" that line and keep processing. I know there are those that will answer - why would you want to do tha...
Python: Plot some data (matplotlib) without GIL
Hello all, my problem is the GIL of course. While I'm analysing data it would be nice to present some plots in between (so it's not too boring waiting for results) But the GIL prevents this (and this is bringing me to the point of asking myself if Python was such a good idea in the first place). I can only display the plot, wait till ...
How do I optimize this postfix expression tree for speed?
Thanks to the help I received in this post: I have a nice, concise recursive function to traverse a tree in postfix order: deque <char*> d; void Node::postfix() { if (left != __nullptr) { left->postfix(); } if (right != __nullptr) { right->postfix(); } d.push_front(cargo); return; }; This is an expression tree. The ...
ksh : Need to delete multiple directories quickly and reliably
Hi , I have many directories and need to delete them periodically with minimum time. Additionally for each directories delete status need to know i.e whether deleted successfully or not. I need to write on the ksh . Could you please help me out. The sample code which I am using, in which I tried launching rm-rf in the background, is no...
Parallel features in .Net 4.0
I have been going over the practicality of some of the new parallel features in .Net 4.0. Say I have code like so: foreach (var item in myEnumerable) myDatabase.Insert(item.ConvertToDatabase()); Imagine myDatabase.Insert is performing some work to insert to a SQL database. Theoretically you could write: Parallel.ForEach(myEnume...
'MaxDegreeOfParallelism' for Array.Parallel?
Is it possible to set 'MaxDegreeOfParallelism' (that is maximum number of threads to use) for Array.Parallel module since under the hood it uses Parallel.For? ...
Subdomain forwarding using .htaccess
I want to redirect a praticular subdomain to the main domain http(s)://dl.example.com/par1/par2 to http(s)://www.example.com/par1/par2 How to achieve the above using .htaccess Why i want to do this: Whenever any user download a file from my server, if the file is huge , then user cannot do any other operation until the file is downloa...
How to synchronize cuda threads when they are in the same loop and we need to synchronize them to execute only a limited part
Hi all, I have written a code and Now I want to implement this on cuda GPU but I'm new to synchronization so please help me with this, It's little urgent to me. Below I'm presenting the code and I want to that LOOP1 to be executed by all threads (heance I want to this portion to take advantage of cuda and the remaining portion (the porti...
Creating parallel selenium tests in C# and using Nunit as the runner application
I am writing a new test suite for the company to test a very complex ASP.NET application which is heavily AJAX driven. We have decided to use Selenium (Grid & Remote Control) and Nunit to run these tests. The actually tests are dynamically created at run time from a spreadsheet. Each Column in an excel spreadsheet relates to a new test...
Build OpenGL model in parallel?
I have a program which draws some terrain and simulates water flowing over it (in a cheap and easy way). Updating the water was easy to parallelize using OpenMP, so I can do ~50 updates per second. The problem is that even with a small amounts of water, my draws per second are very very low (starts at 5 and drops to around 2 once there'...
Solving Combinatory Problems with LINQ /.NET4
I saw this article pop-up in my MSDN RSS feed, and after reading through it, and the sourced article here I began to wonder about the solution. The rules are simple: Find a number consisting of 9 digits in which each of the digits from 1 to 9 appears only once. This number must also satisfy these divisibility requirements: The numbe...
Parallel Web Service Calls in Java
Is there anyway to make web service calls from a Java client app. (Apache Axis based) in parallel? Does async style Web Service client (Apache Axis based) help? ...
Avaliable parallel technologies in .Net
I am new to .Net platform. I did a search and found that there are several ways to do parallel computing in .Net: Parallel task in Task Parallel Library, which is .Net 3.5. PLINQ, .Net 4.0 Asynchounous Programming, .Net 2.0, (async is mainly used to do I/O heavy tasks, F# has a concise syntax supporting this). I list this because in M...
NHibernate, the Parallel Framework, and SQL Server
hey guys, we have a loop that: 1.Loops over several thousand xml files. Altogether we're parsing millions of "user" nodes. 2.In each iteration we parse a "user" xml, do custom deserialization 3.finally, in each iteration, we send our object to nhibernate for saving. We use: .SaveOrUpdateAndFlush(user); This is a lengthy process, an...
Understanding VS2010 C# parallel profiling results
I have a program with many independent computations so I decided to parallelize it. I use Parallel.For/Each. The results were okay for a dual-core machine - CPU utilization of about 80%-90% most of the time. However, with a dual Xeon machine (i.e. 8 cores) I get only about 30%-40% CPU utilization, although the program spends quite a lo...
Do you know any build systems with decent support for parallelization?
Hi, I am looking for a build system (working on ms windows) that has good support for parallelization of tasks/targets (or whatever you call them). To be more specific - during build (that is initiated on MS Windows machine) I need to copy source files to a number of different machines (which are not necessarily running Windows) and st...
Per-thread memory management in C#
Continuing the discussion from http://stackoverflow.com/questions/2902984/understanding-vs2010-c-parallel-profiling-results but more to the point: I have many threads that work in parallel (using Parallel.For/Each), which use many memory allocations for small classes. This creates a contention on the global memory allocator thread. Is...
Special class of parallel programs, where run order will not matter
I'm looking for parallel programs( parallel loops ) that can run in order, but has no message passing between processes, and has lots of synchronization. It should be possible to run the loop in any order, yet producing correct results, even if the result is not the same always. An example would be a ticket booking system, where the fir...
parallel.foreach with custom collection
I am extending the System.Net.Mail.MailAddress class to include an ID field, so I created a new custom MailAddress class that inherited from the existing class and a new custom MailAddressCollection class. I then overrode the existing System.Net.Mail.MailMessage.To to use my new collection. I would like to process the recipients in par...