Re: Most elegant way to query 400 computers in C#? - C# Discussion Boards

Dave Kreskowiak4-Nov-05 5:52

4-Nov-05 5:52

The GC won't free the Reserved memory unless Windows asks for it back. GC keeps this reserve so it can quickly allocate memory for new objects. You can't specify how much and can't control how this reserved pool is managed in any way.

If you want to know how much memory your application is REALLY using, TaskManager is the worst possible place to go. For more accurate information, you need to use the .NET CLR counters in Performance Monitor.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: get GC to collect unused memory

Jon Rista4-Nov-05 16:33

Jon Rista

4-Nov-05 16:33

There are Win32 API calls you can call through PInvoke that will force windows to reclaim the memory that GC has reserved. There is something called "working set" that windows uses to manage memory usage for standard windows apps (primarily, those with a window...vs. a windows service for example. A quick test you can run is to check your apps memory usage when its a window, and check again after minimizing it...most probably, you'll see a change in memory usage, sometimes a significant change). You can force your application to free memory down to its minimum working set size, and you will see a change in your apps memory usage in Task Manager. Just be forwarned, this is NOT RECOMMENDED. As has already been mentioned, the GC tries to keep as much memory in reserve as it can for performance reasons. The GC is also a highly intelligent piece of code, and it will behave differently on different systems, and even on the same system in different conditions. Trying to "force the issue" in regards to freeing memory usually results in a loss, overall, in one way or another. Ultimately, the GC knows best, and you should let it do what it does.

-- modified at 22:34 Friday 4th November, 2005

Oops, replied to the wrong one. Apologies. Poke tongue | ;-P

Re: get GC to collect unused memory

Dave Kreskowiak5-Nov-05 2:49

Dave Kreskowiak

5-Nov-05 2:49

Jon Rista wrote:
Just be forwarned, this is NOT RECOMMENDED.

That's why I don't tell anyone this. Nothing like giving someone the key to killing the performance of their app...

Jon Rista wrote:
Oops, replied to the wrong one. Apologies.

;)

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: get GC to collect unused memory

Jon Rista5-Nov-05 9:57

Jon Rista

5-Nov-05 9:57

Well, there are times when its useful to use it. I don't know Stefan's situation in detail, and if he really does need it, its the only way to do what he needs. I don't think its my place to judge someones capabilities, and if places were reversed, I'd rather be given the knowledge than be keept in the dark by someone who doesn't know my skills or intents.

In Stefan Fohringer case, beeing that his application will be used in Terminal Services, it could very well be neccesary to have a higher degree of controll over his applications memory usage. There are numerous issues with .NET applications running under WTS where memory usage becomes a major issue. You can search the net for numerous blogs on the issue.

-- modified at 16:00 Saturday 5th November, 2005

Most elegant way to query 400 computers in C#?

artisticcheese4-Nov-05 4:44

artisticcheese

4-Nov-05 4:44

Hello,

I wrote singe-threaded console application which goes through the list of IP addresses and quries them individually if they are up and running or not. Each run takes 20 s for non-responsive computer since it's default timeout of socket in Windows, becouse of that it takes 4 hours to run my application.
I want to optimize application with multi-threading features but since I never done it I'd welcome any pointers or good articles or code samples for that matter.
What I ultimitately would like to do is to have like 10-20 threads in pool and feed my list of IP addresses to that pool when thread finished executing I'd like to update global DataSet for applicaiton with results of quieries.

Thanks,
G

Re: Most elegant way to query 400 computers in C#?

Rob Graham4-Nov-05 5:14

Rob Graham

4-Nov-05 5:14

Why not just send a UDP broadcast, then listen for responses? You could then periodically scan the list of responders and mark any that haven't replied in some period of time as down. This would require a small 'responder' program in each node the listened to the 'are you up' query and replied with its own "i'm up" udp broadcast.

Absolute faith corrupts as absolutely as absolute power
Eric Hoffer
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke

Re: Most elegant way to query 400 computers in C#?

artisticcheese4-Nov-05 5:17

artisticcheese

4-Nov-05 5:17

Well, I did not fully specify requirement. I'm not acutally looking for servers being up or down but for SSL servers so I have to connect using TCPClient.

Re: Most elegant way to query 400 computers in C#?

S. Senthil Kumar4-Nov-05 21:39

S. Senthil Kumar

4-Nov-05 21:39

You can use the ThreadPool class provided by the .NET Framework, but it's not really recommended for executing long running operations (in the order of 20 seconds). You can find plenty of implementations for ThreadPools if you search around in CP. In any case, the idea is the same.

void YourMainFunc()
{
  for (int i =0; i<listOfIPs.Length; ++i)
  {
     ThreadPool.QueueItem(ThreadFunc, listOfIPs[i]);
  }
}

void ThreadFunc(string IP)
{
   if (SuccessfulQuery(IP))
   {
      UpdateDataSet(IP);
   }
}

void UpdateDataSet(IP)
{
   lock(xyz)
   {
      //make changes to dataset
   }
}

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Most elegant way to query 400 computers in C#?

artisticcheese5-Nov-05 2:31

artisticcheese

5-Nov-05 2:31

what is "xyz" in lock function?

Re: Most elegant way to query 400 computers in C#?

S. Senthil Kumar5-Nov-05 3:17

S. Senthil Kumar

5-Nov-05 3:17

Any object, I put a lock statement just to indicate that the Dataset might be accessed by multiple threads, so you need to some kind of synchronization.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Remoting - recovering communication

duff794-Nov-05 4:37

duff79

4-Nov-05 4:37

Hi,

How do i deal with the case of recovering communication between client and server if one of them has just restarted?

At the moment if I close my client (after succesful communication) and restart it, i can't communicate with my server, i have to close down the server and restart that too. What am i missing?

Any help greatly appreciated.

Thanks in advance

Duffs

Any good C# 2.0 books out yet?

Ed K4-Nov-05 3:46

Ed K

4-Nov-05 3:46

For ASP.NET and the language?

ed

~"Watch your thoughts; they become your words. Watch your words they become your actions.
Watch your actions; they become your habits. Watch your habits; they become your character.
Watch your character; it becomes your destiny."
-Frank Outlaw.

UnTrapping of Mouse Events

wheelerbarry4-Nov-05 3:38

wheelerbarry

4-Nov-05 3:38

Is there an easy way of passing mouse events from a control to the form below in, e.g i have a label on the form and want any mouse events that happen on the label to be passed to the form underneath it.

I cant just disable the label (e.g. label.Enabled = false) as i still want the label to be able to respond to the events before the form.

My only idea is to send another message to the form when the label recives it, but this seems a little long winded.

Barry Confused | :confused:

Re: UnTrapping of Mouse Events

Dave Kreskowiak4-Nov-05 5:47

Dave Kreskowiak

4-Nov-05 5:47

wheelerbarry wrote:
My only idea is to send another message to the form when the label recives it, but this seems a little long winded.

And it's the only way to do it. Mouse clicks will not go to all (or selected) windows beneath the spot where the mouse was. You actually have to create a new mouse message and manually send it to the windows you want. For this, you'll have to have the window's handle (hWnd).

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Richtextbox

PaulaM4-Nov-05 2:38

PaulaM

4-Nov-05 2:38

How can I have my richtextbox accept a tab correctly?curently when I press the tab key, it does not do anything .

thanks Smile | :)

regards paula

Re: Richtextbox

mav.northwind4-Nov-05 2:49

mav.northwind

4-Nov-05 2:49

Why not try the AcceptsTab property? Cool | :cool:

Regards,
mav

HTTP Protocols C#

TAREQ F ABUZUHRI4-Nov-05 1:29

TAREQ F ABUZUHRI

4-Nov-05 1:29

i need help plz

i want to open web Page in my program without use internet Explorer
Just by using my program and Set value to textbox and then Push Submit button

after taht i will have sisson from this site , i want to access another page inthe site and make check to CheckBox

Ex:
i want my program to open http://www.mysite.com/login.aspx
and set user name & password to textbox in the login page and push SUBMIT button

then i will have sisson from this site to assecc http://www.mysite.com/myacount.aspx
i want to make check to checkbox in this page
-----------------------------------------------------------

Palestine

Re: HTTP Protocols C#

S. Senthil Kumar4-Nov-05 3:34

S. Senthil Kumar

4-Nov-05 3:34

You're looking for the System.Net.HttpWebRequest[^] class. That allows you to read and write HTTP data.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: HTTP Protocols C#

Ed K4-Nov-05 3:51

Ed K

4-Nov-05 3:51

You'll need to create your parameters and handle your response...and I'm guessing you are POSTing...

private string GetResponse(string URI, string Parameters)
{
WebRequest webRequest = WebRequest.Create(URI);
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.Method = "POST";

// data
byte [] bytes = System.Text.Encoding.ASCII.GetBytes(Parameters);
webRequest.ContentLength = bytes.Length;
Stream os = webRequest.GetRequestStream();
os.Write (bytes, 0, bytes.Length);
os.Close ();

// response
WebResponse webResponse = webRequest.GetResponse();
Stream s = webResponse.GetResponseStream();
StreamReader streamReader = new StreamReader(s);

return streamReader.ReadToEnd().Trim();
}

Hope this helps!

ed

~"Watch your thoughts; they become your words. Watch your words they become your actions.
Watch your actions; they become your habits. Watch your habits; they become your character.
Watch your character; it becomes your destiny."
-Frank Outlaw.

How to not close a form?

patgo4-Nov-05 1:07

patgo

4-Nov-05 1:07

Hello!

I have a windows form that, by use of a menu, opens another window (not an MDI child). When I close this new window, the form also closes. How can I prevent this from hapenning?

Thank you,
Patrícia Gonçalves

Re: How to not close a form?

ventomito4-Nov-05 7:34

ventomito

4-Nov-05 7:34

You can try with a modal window...

<br />
Form1 form = new Form1;<br />
form.ShowDialog();<br />

try this..

hope it helps ^^

Networking Help!!!Please

snouto4-Nov-05 0:24

snouto

4-Nov-05 0:24

how can i connect two clients knowing their ip addresses but each one
may be using different or same connection type Like may be DSL or
Dialup connection by knowing ip addresses ?

Additionally, i programmd two applications one is the server and one is
the client.
I gave the client application to my friend on the internet through
yahoo messenger chatting and i gave him my ip address and then i ran my
server listening on specific port and on my current ip address which i
took from my dial up connection but this is not useful because the
client gave him an exception telling him that (the server can't be
found) That means he didn't see my ip address as connected device
through the network may be this is because iam behind firewall but my
pc already doesn't have any firewall plugged in or may be Iam behind
NAT !!!! ok but if my ip address is private address which made my
friend can't logged in into my server application so what is the
solution ?

Mess With The Best And Die Like The Rest

Re: Networking Help!!!Please

Guffa4-Nov-05 4:03

Guffa

4-Nov-05 4:03

Find out your public IP address.

whatismyip[^]

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b { font-weight: normal; }

looking for a control (newbie)

Dragan Matic3-Nov-05 23:42

Dragan Matic

3-Nov-05 23:42

I am looking for a TextBox control that would allow entering numbers only and with a digit grouping, the same way that Calculator does it in Windows XP when digit grouping is switched on.

Is there a control that can do it, or is it possible with standard windows forms textbox control?

Tnx in advance

Dragan

Re: looking for a control (newbie)

MoustafaS4-Nov-05 0:14

MoustafaS

4-Nov-05 0:14

Just try in it, and post here your problems and questions, and try to use the standard TextBox and use its events like TextChanged and do your custom code within it.

"I am a lair" Is this statement true or false ?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.