I have an application that requires the use of many threads. How do i monitor the memory consumption of my application?And how can i monitor the CPU usage of my application if possible?And is it possible to monitor the memory consumtion and CPU usage of each of these threads?And is it possible to limit or prioritize the memory consuption or cpu usage of the whole application or of each thread?
View 5 RepliesComing from more low-level languages like C++, and seeing how transparent .NET memory management is, I've got a concert about a piece a line of code I've written. In C++, every object necessarily (dictated design practices and peculiarities of memory management) needs to have a constructor and a destructor. In .NET, destructors aren't needed as often, and there are different patterns of when they are required and how to use them. My question is this. If I have the following like of code (in VB.NET, but equally applies to C#)
[Code]...
a) Dim strName as string
For i=0 to 100
strName=GetName()
do something with strname
Next
b) For i=0 to 100
Dim strName as string=GetName()
do something with strname
Next
Out of a and b which will be faster and consume less memory
Public sub GetResourceAttributes()
Dim colreSource as object
.using the colresource
colresource=nothing
end sub
Is sentencing'colresource =nothing'is good programming technique or is it enough to leave nothing done on 'colresource'. Like GC will take care of 'colresource' when there is no reference to the object.
I have an application which I've developed which queries Active Directory information and stores about 15 properties into a Datatable which is kept in memory. I need to decrease the amount of "Commit" memory it is setting aside. The application stays active in the system tray and allows for quick searching of information along with pictures for users. I have a class, which is able keep memory usage down pretty low. It runs on a timer every 10 seconds and listed below:
[Code]...
I have 200,000 rows data need to be inserted into MSSQL 2005 express. I have 4G memory. From the beginning, there is 2.0G used. Then, I use microsoft text driver to load text file into datagridview. Memory rise to about 2.8 GB.I start write data row by row from datagrid view. Memory usage keep rising , then OutOfMemory exception is catched.I try to use GC.Collect and for System.Data.Odbc.OdbcConnection , I also try .Dispose(). But it is no use.How can I keeing the memory within about 3.0GB for this usage ? I monitor .vhost.exe. It rise to more than 1G.
View 2 RepliesI cannot use Visual Basic 2008 at all. When I go to "new project" and choose "Windows Form Application" I get this error.I have tried multiple uninstall/reinstall with no result.A microsoft reply to this suggested that I needed: " .NET Framework 2.0 Service Pack 1 " I checked, and I did not have the .netframework 2.0 service Pack 1.
When I tried to download and install the above from Microsoft.com, the istaller said that "it was not allowsed" and I was not able to install the service pack 1.
I tried Uninstalling net framework 3.5, 3.0, 2.0 and then reinstalling .netframework 2.0 sevice pack 1; then reinstalling Visual basic 2008 express edition. At the reinstall of Visual basic 2008, .netframework 2.0 sevice pack 1 is unistalled by .net framework service pack 2.When I check the foruims for simiar problems, the formus are mostly for Visual basic 5.0, or other programs that I do not have.
Here is the programs I have installed:
Operating system: Windows XP
Microsoft .net framework 1.1
Microsoft .NET framwork 1.1 Hotfix(KB928366)
Microsoft .Net Framework 2.0 Service Pack 2
[code]....
All the security updates and hotfixes for Widows XP.
Using WINFORMS (VB 2008 Professional) in an XP Pro system, I have been able to create Data entry forms that capture required variables from user necessary to generate price/profit/resources required for a given project. The entry forms comprise textboxes, numeric updowns, comboboxes. All my calcs run well and I output the control contents to tables in SQLExpress. (I am a landscape architect).
But, I have to find out how to:1. Save contents of all data entries on the quotation form as a Project1.(suffix) file (as well as the current SQL DB), such that the user can at a later date, reopen original quotation details and rework the original estimate by altering one or more of the controls on the form. User can then save again and so on until user issues his/her final quote estimate to client.
I have been on some journey trying to pin this down - to no avail really; although tempted to ring the infamous (and very eloquent) Beth Massi, thought I would seek help from this Forum first.
I write as a systems administrator and own VS Team 2008 Team Suite. I would want to learn about the features within the package that allow developers to collaborate with other developers either real-time or otherwise.Additionally, I would want to learn about the features that would allow me to assign and monitor the progress of projects.
View 3 RepliesI'm trying to update a data user using vb.net2008 and sql server management studio express for my backend. the error says "must declare the scalar variable "@username"
Here's the code .
Private Sub btnupdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)Handles btnupdate.Click
Dim connstring = New SqlClient.SqlConnection("Data Source=MISD-
[CODE]...
I am an absolute newbie in both oracle and visual basic. I have covered some basics as tutorials and want to develop a database using Visual basic as front end and Oracle as back end. I have Visual Studio 2008 installed and I will use Visual Basic from that. I also have Oracle 10g express edition installed on my system.
View 6 RepliesI'm using Visual Basic 2010I've created a ListBox and a BackgroundWorker using designerI want to change the location of listbox using backgroundworker but I get the error as follows:"InvalidOperationException was Handled by user code:"Cross-thread operation not valid: Control 'ListBox1' accessed from a thread other than the thread it was created on
View 10 Replieshow to do serial communication using threading in vb.net 2008,
View 1 Repliesafter i get a successful ping response i need to send an HTTP request to the device examine the response and then display it. i'm trying to multi thread the 2nd bit with no joy so far.
Imports System.Net
Imports System.Net.NetworkInformation
Imports System.Threading
[code].....
I would like some advice on multi-threading. I currently utilize two threads, one for the GUI, and the other for calculations. This works well, but I want to improve my multi-threading techniques. Currently the data is with the calculation thread, and this occasionally this will cause a slow down. I want to put the data on its own thread. Giving me three threads, Data, UI, and Calculations. This should improve responsiveness, and not be overwhelmingly complex.
My problem is, this no longer fits into the parent child relationship well. All three threads need to interact with each other. My question is, what is the better way of dealing with more than two threads, when all the threads need to interact with each other. Should I pick one thread as the ultimate parent, say the data thread (I pick this one, because it seems to me this thread will be the most free.) Then have the calculation thread and the UI thread children of the data thread. Then when I have a need for the UI thread to explicitly call the calculation thread, I do this through a function in the data thread.
I have an application I'm working on that is essentially an Excel workbook generator (special input files for our wireshop machinery). Therefore, it's process is lengthy.
Is it possible to build a Cancel feature while it is looping through its collections to process these files?
If so, would I need to implement multi-threading?
I have an application that I need to automate where at a certain time each day, say 6pm, it will run a certain method(which is to check a database for key terms and then access the api to search for these terms). But there is the main process which is running all the time accessing the stream api so when the search is complete, it interrupts the stream and hands over the new terms. Now I thought of adding the .exe file to windows task scheduler but not sure if that would work. The stream method runs indefinitely and at 6pm each day another process needs to run. I thought of using the system.threading.task TaskFactory but I am using visual studio 2008 ( I do have .net framework 4.0)If it launches using the task scheduler as 6pm with my code logic as follows:[code]
I see how this would eat the CPU...the streaming process is basically following a list of user profiles listening for new activites and storing these as XML files. This a real time feed to an API. At a specific time once a day, a second process needs to go access a database for new ids, and if there are new ids, then go to a search API and get new user profiles. This is the main criteria..once the new user profiles are found, the list that the stream users needs to be updated so the process will be interrupted for a second or just paused and then continue processing.
I'm just looking for other people's thoughts and opinions on the way I have done something.I have a console application which needs to connect to various computers and reset the local admin password on each one. I got it all working but then decided that as there are a lot of PCs, it would be a good idea to use the thread pool to do a few at the same time.The problem is, I need this program to be run without any human interaction - so I cant just use ThreadPool.QueueUserWorkItem and pass it all of the computers to connect to, because then the program would exit after it had called QueueUserWorkItem for each one because there is nothing left for it to do. I cant stick a Console.ReadLine in there because like I said, it needs to be run automatically without anyone typing anything.
View 1 RepliesIs is possible for the server to give all clients that are connected to it a separate threading starting from 1-2-3-etc that will be display there username on a listview. Server can now connect to any of them by clicking on one of the items in the listview.
EX: Multi-Clients Connect to server ---> Server gives each one a separate thread starting with 1 ----> Client sends username to server -----> Server displays them on listview ---> Server can now double click or whatever on the item ---> Pulles up thread count and connects to it.
Wheres my error on this code...
Imports System.Net
Imports System.Threading
Public Class Form1
[CODE]...........
Basically what I want to do is that User will select how many thread w/c is the PickThread.value, then it will do the stuff.
i got inside
WebBrowser1_DocumentCompleted sub
the code below
WebBrowser1.Document.GetElementById("form").InvokeMember("click")
Call ProcessNextLine()
when it clicks this button it should load another page(Like log in)
Call ProcessNextLine()
takes next line from txt file (It's url) + navigate
but I want it to wait let the page load before calling "Call ProcessNextLine()" I tried System.Threading.Thread.Sleep not working?
What is the difference in using: BackgroundWorker1 or System.Threading.Thread
View 3 RepliesTrying to get System.Threading.Timer to work!! I am converting a small form based application to run as a services, The app just runs an monitors a folder and then when it finds a file to does some work on it. Having changed the form.timer to threading.timmer - The timer stopps working after a while. Below is a simple test services - when you look in to the text file it stops after approx 130 entries
[Code]...
How do I make a chat room that multi clients will be connecting to at once. Im trying to add a ping/pong method which is just msgbox that tells the user if the message was received. I know that you need a background worker for this but how do i handle all the msgs that are going back and forth to all the clients that are connected to the server
View 1 Repliesi have tryed using multithreading with my program with no luck/I just get a strange error thrown at me no matter what i try [code] Then i get this error:An error occurred creating the form. See Exception.InnerException for details. The error is: ActiveX control '6bf52a52-394a-11d3-b153-00c04f79faa6' cannot be instantiated because the current thread is not in a single-threaded apartment.
View 13 RepliesI'm not sure how to explain what's happening but it seems to be deadlock, i did search along the forum and actualy did find who had the same problem as i did. Unfortunatly i'm too new to this Threading and could not understand why does this deadlocks happen or how to avoid them.I'm using the following
Dim t As New Threading.Thread(AddressOf MyTestingSub)
t.Priority = Threading.ThreadPriority.BelowNormal
t.IsBackground = True
[code].....
I would like to know what are the usages for Threading or BackgroundWorker, and their implementations.I currently am running a UDP program, but the server freezes until the client sends the packet, which momentarily unfreezes the server, and then re freezes it.I have looked at the MSDN for them and they seem complicated :l
View 26 RepliesI am creating an IDE for a game script with similar functionality as the Visual Studio IDE (at least, some of it). The game script consist of code that looks visually a bit like C code. It uses braces to define the start and end of a 'class' and uses nested braces to define the start and end of an 'event' in a class.
What I want finally is to have two Comboboxes above the text editor, one that lists each Class and the other listing each Event. The comboboxes should also show the Class and Event that the caret is currently in, just like in Visual Studio.I have attached an example of such a script (you can open it with Notepad).However, here is a short example where you can also see how I "defined" classes and events:
class1
{
event1
{
[code]....
As you can see, the classes are the 'names' of each block of code, defined by matching braces { }. The events are the names of each nested block of code, also defined by matching braces { } but inside a class. There is only one level of nesting.As you can also see, the layout can follow the standard C-style layout, or a slightly different layout (using the opening brace on the same line as the class/event name), or even a completely chaotic mess. As long as the braces match correctly, the code is valid.So in short, the large blocks are classes, while the nested blocks are events.
What I want to do, is parse an entire script, and store all the Classes (and eventually, also all the Events, but let's forget about them for now). I want to store the Class name, start position (defined as the start index of the name), end position (defined as the index of the closing brace) and the full text (defined as the text between start and end position, so including the name).
vb.net
Public Class clsClass
Private _Name As String
[code]....
The code works basically by finding every first opening brace (the opening brace of each CLASS, not event), and then loops through the class (using a brace counter to keep track of the nested braces) until it found the last closing brace. It then stores the name, start, end and fulltext in a new clsClass and adds it to the list to return.
Multi-Threading. I have got a simple bit of code that will need to be repeated but with a chance of it overlapping the only complex bit is there will be a varible that will be different each time. so I was wondering if I put it in another Thread and store the varible within the thread code would that achieve what I am looking for? To make it slightly easyier once the thread is started and pulled the Varible in there will be no cross talking between the thread and main app thread (ie no progress reports, no aborts/suspends etc) Nothing will be feeding back on thread completion either, when it ends it ends.
This is what I have so far:
Imports System.IO
Imports System.Threading
[CODE]...........................
I cant get System.Threading.Thread.Sleep to work..[code]
View 2 RepliesWhen it comes to threading. I've managed to adapt one of JMcIllhinney's backgroundworker codebank examples to somewhat suit my needs, but not completely. I have a main form, and a second form that appears while I'm running through a for loop. It informs the user what is currently happening. I set up a backgroundworker that allowed me to continue to use the main form during the for loop, but the other "status" form was completely frozen, and any labels or graphics were shown as white boxes. I am struggling to figure out how to be able to move/interact with both forms while the loop is running.
View 4 Replies