Parallel.for Or Task.startnew In Multithreading Process?
Mar 22, 2012
I have a list of strings that I need to pass to a process in a different class. What I want to know which of the two ideas would be a better approach to use in terms of speed,efficiency and parallel processing. The list contains +- 10000 strings and I want to limit the threads appropriately to have only about 5threads running at one time:
For i as integer = 0 to searchPages.Count - 1
Parallel.For(0,10,Sub(x)
ps.processPage(searchPages.Item(i))
I am trying to start a new thread in VB.Net and having syntax problems.In C# this is we can do the same task using
var manualResetEvent = new ManualResetEvent(false); waitHandles.Add(manualResetEvent); var taskOne = Task.Factory.StartNew(() => new Thread(TaskToRun).Start(manualResetEvent));[code]....
where TaskToRun is a void method with a single object parameter.All online converters generate similar code to this
Dim manualResetEvent = New ManualResetEvent(False) waitHandles.Add(manualResetEvent) Dim taskOne = Task.Factory.StartNew(Function() New Thread(AddressOf TaskToRun).Start(manualResetEvent)) taskOne.Wait()
I have been following the development of the .NET Task Parallel Library (TPL) with great interest since Microsoft first announced it. There is no doubt in my mind that we will eventually take advantage of TPL. What I am questioning is whether it makes sense to start taking advantage of TPL when Visual Studio 2010 and .NET 4.0 are released, or whether it makes sense to wait a while longer. Why Start Now?
I was wondering if this code could be better optimized for multithreading. What it does is open a process and loops through the data, there could be any range of files to open (so I would like to have say 2 or 3 processes at once):
I have a list of(myclass)each item of this list need to be elaborated before being inserted in the list.Is it safe to use parrallel processes to fill shared list where each process has to fill a predefine range of the list? Or is it necessary to freeze the list when one process is filling it? in other words: can many process fill the same list in the same time without problems
i have use VB.Net 2005 for creating a application for Open new windows explorer by code and close this windows explorer when I close my application. I Open windows Explorer by this code.
How would I Make a program that would detect running process in the taskmanger: Info on my program +Like I want it to load the process name's in a Rich textbox or label or textbox (if that's possible XD). + And I will Have a Button that once I see all the process and then the button1 will kill the processes I Pick.
In the code below, I open excel file, when I try to enter some values into excel cells, and close it afterwards. For some reasons excel process is still active in task manager. I am releasing objects, quiting application like for other excel files in my program, but in this specific example can't do this. The code below is written in Visual Studio 2010, windows 7.
Imports Microsoft.Office.Interop Public Class Form1 Public MainPath As String = System.IO.Directory.GetCurrentDirectory() Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click [Code] .....
When I go to Debug my program (F5), the program will load, until I click on the form with the main part of code in it, and then the program freezes, although it doesn't lock up because as soon as I press stop debugging/ task manager end process, it closes fine.
I will attach the zip of the program here. The form that it freezes on is "Black Ops". Edit Due to the forum not accepting my .Zip file (Invalid file type), I will upload it to MediaFire. Download link (445kb): Click Here
I have a service that scans network folders using a parallel.for method. However recently I am finding if I stop the service then while windows says the service is stopped the process is still running in task manager. However it is at 0 cpu and the memory does not change. If I try and end the task (even a force in command prompt) it just says access denied and i have to reboot the server. What would be the best way to make sure everything terminates? I thought of adding a global Boolean that in the stop procedure it turns true and part of my parallel code will check for that and call s.stop.
A long time ago, on a PC far, far away from Windows, one MS-DOS program (the father) could run / execute / spawn another MS-DOS program (the son). When the son terminated, it could set a return code which could certainly be interrogated by an MS-DOS batch program or, I think, by any father program that invoked it (depending on the language in which that program was written). I have a small utilility which I want to invoke from my application, and, since that utility sets a return code, I would like to interrogate it in my application when the utility terminates. I've looked through the MSDN Library but could not find anything that seemed to cover this situation. Is there a way to do this in Visual Basic 2008 Express
i dont no much about vb.net ..i am php developer i have just developed a mini application in vb.net i wanted to know how to hide our application from appearing in task manager...
When multithreading in VB, if you close the form while different threads are running, the process itself will not end. Is there a way I can force all threads to end, or end the process like in the Task Manager, when the form is closed?
how can i close a hid form without make "end process " in the task manger.how to save a textbox.text inside text file if the form closed be "end process " in the task manger?
is it guaranted that a task A started before TaskB will be completed before task B assuming the task do the same level of operatons?or in other words is there a chance that a task B will finish before tast A in the assumption that the task calls the same procedure?
I have written a windows service that is meant to launch a notepad when a specific action happens. The problem i have is that even though the service launches notepad, the actual notepad it self is NOT visible. I know that it has been launced because i can see the process in the task manager. By the way the process is listed as a SYSTEM process rather than a process under my user name (i believe that is because my process is a "LocalSystem" one).
im using tasks parallel library in .net 4.0 i want to have the ability to specify a task for each core independant of the other cores. usually in TPL, i create a task and i tell it to run in parallel, i have no control over the number of threads created nor can i control the number of cores to participate in the parallel task. also, i cant specify each particular core a different task.i'd like to know how to achieve this in TPL if it is possible.
I have been reading up on the parallel programming and even now still a little confused on the whole concepts. Lets say I have a single project with about 5 classes that interact and have local variables in methods and variables accessible to all methods in a single class and even 1 or 2 variables accessible to all classes accessed through instantiation. Now using threads I know that global variables would be overridden by multiple threads if there were no locking applied but local variables to a method/function do not, right?
So if I ran the project multiple times meaning as a new process, the methods and variables would be thread safe right and no data corruption occurs? So to implement parallel programming using the task factory, if I created a project that basically creates tasks and each task is basically running an instance of another project, then shouldn't the variables and data be thread safe and safe from corruption? But what if I had the output files and they named by Output & datetime.now.tostring, would there be conflict issues and I ask this knowing that I have seen this happen when trying it. [Code]
