Detect Hyper-Threaded Cores - C# Discussion Boards

Richard MacCutchan8-Oct-13 9:51

Richard MacCutchan

8-Oct-13 9:51

electriac wrote:
Any thoughts?

My first thought is, "what is your question"?

Veni, vidi, abiit domum

electriac8-Oct-13 9:54

electriac

8-Oct-13 9:54

Does this appear to be correct?

Richard MacCutchan8-Oct-13 9:58

Richard MacCutchan

8-Oct-13 9:58

Appearances can be deceiving. Why not test it for yourself to see what happens, you may be surprised at what you can learn that way.

Veni, vidi, abiit domum

Dave Kreskowiak8-Oct-13 18:50

Dave Kreskowiak

8-Oct-13 18:50

The term "correct" would be dependent upon the codes overall purpose. Since we know nothing of what you're doing or why, it's impossible to answer the question.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Eddy Vluggen8-Oct-13 22:33

8-Oct-13 22:33

electriac wrote:
Any thoughts?

Not only the stream is disposable, but also the streamwriter.

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If you can't read my code, try converting it here[^]

http://msdn.microsoft.com/en-us/library/system.io.file.writealltext.aspx[^]

Richard Deeming9-Oct-13 1:36

Richard Deeming

9-Oct-13 1:36

Since you're just overwriting the file if it exists, try:

File.WriteAllText(fileName, textBox1.Text);

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Detect Hyper-Threaded Cores

Nicolas Légaré8-Oct-13 9:33

Nicolas Légaré

8-Oct-13 9:33

Hi,

I've been playing around with multi-threaded code, setting affinity on different threads, etc... In my particular application, I have noticed performance is actually better when avoiding running threads concurrently on certain processors.

To be more precise, I have an hyper-threaded CPU and when assigning work to both logical processing units inside a core, it takes longer to run. Perhaps my code isn't optimized, but that's besides the point.

So my question is: How can I detect which two (or more, I'd like to be future proof here) logical processing units are from the same core?

I've done some research online and found some information that has lead me to believe CPU0 and CPU1 would be from the same core and CPU2 and CPU3 from the other one, in an hyper-threaded dual core CPU. But my testing is telling me otherwise (CPU0/CPU2 and CPU1/CPU3).

Thanks in advance!
Nic

Re: Detect Hyper-Threaded Cores

Eddy Vluggen9-Oct-13 0:29

Re: Detect Hyper-Threaded Cores

9-Oct-13 0:29

Nicolas Légaré wrote:
Perhaps my code isn't optimized, but that's besides the point.

Show us the code. Parallel code is hard, and an inefficient implementation will always be slower. Task switching has it's overhead.

Nicolas Légaré wrote:
I have noticed performance is actually better when avoiding running threads concurrently on certain processors.

Windows uses threads a lot, so I'd expect it to be quite optimized. What processor are you seeing this on, do you have an example app that reproduces the problem?

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If you can't read my code, try converting it here[^]

Nicolas Légaré9-Oct-13 10:21

Nicolas Légaré

9-Oct-13 10:21

Hi Eddy,

Thanks for replying.

I have since fixed up my code, it had issues with terminating threads. It's much faster now with both sides of the core running.

As an exercice though, how could I detect which logical processing units are part of one core? I was able to run a CPU stress test to test two CPUs at one, the results can tell me which two CPUs make up both sides of each core. This test takes a while to run, it'd be nice to have a simple API to call to get this.

Thanks
Nic

Simples Snaplines code

Spessotto8-Oct-13 5:05

Spessotto

8-Oct-13 5:05

Hello everybody!

Im trying to do a Form Designer on C#, looked all over the web for this...Found an project using a custom dll, but i just want to know how to put the snaplines (that lines who helps a lot to align controls like in Visual Studio) on my form with my dinamically controls.. Someone could help me?

thanks!

Rafael

Ron Beyer8-Oct-13 5:52

Ron Beyer

8-Oct-13 5:52

This is unclear, are you hosting the Windows Forms designer and you want to know how to show the snaplines?

Or...

Are you trying to design your forms runtime and you want to show snaplines?

Or...

Are you using custom controls in Visual Studio and you want your controls to participate in snaplines?

Spessotto8-Oct-13 6:27

Spessotto

8-Oct-13 6:27

Sorry Ron..

Im making a form designer that uses dinamically created controls..like a textbox... In this form the user can move the controls like he wants.. And i want to put these snaplines to make alignment easier...

regards,

Rafael

Ron Beyer8-Oct-13 7:11

Ron Beyer

8-Oct-13 7:11

I apologize but its still not completely clear... Are you making your own form designer, or are you hosting the Windows Forms Designer? Its an important distinction because one supports it out of the box and the other does not. Snap lines are a function of the designer, not the text box (well, not entirely). If you are hosting the Windows Forms Designer its easier, but if you are making your own form designer then its a lot more difficult.

Spessotto8-Oct-13 9:21

Spessotto

8-Oct-13 9:21

im making my own form designer...

Ron Beyer8-Oct-13 9:44

Ron Beyer

8-Oct-13 9:44

This will have to be a custom solution then. It really depends on your code, but what I would do is to get the ControlDesigner from the TextBox and see what the offsets for the snap lines are. These lines are then drawn on the main form when the X or Y approaches (within some number of pixels) another control on the form.

There really isn't a "simple" solution to the problem when implementing your own designer. Its really a lot of work to determine if the form is in design mode, get the control designer, get the snap lines properties, find out where the control is in relation to other controls, read their snap lines properties and then draw the lines on the form.

develop multiplayer game

cdpsource8-Oct-13 2:33

cdpsource

8-Oct-13 2:33

I want to develop multiplayer game online and I plan to use SQL Broker to notify user when it is turn to play, or which technique you suggest me to use.

Regards

Eddy Vluggen8-Oct-13 5:00

8-Oct-13 5:00

Why SQL Broker, simply to inform someone it's their turn?

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If you can't read my code, try converting it here[^]

cdpsource8-Oct-13 21:05

cdpsource

8-Oct-13 21:05

I want to develop tic-tac-toe game online for two users and
SQL Server I will use to save players move and broker i will use to notify when soneone's turn to play, or should I use another way to notify user when is turn to make a move.

Thanks

Eddy Vluggen9-Oct-13 3:04

9-Oct-13 3:04

It sounds like a bit overkill to have a paid version of Sql Server to play a tic-tac-toe game.

cdpsource wrote:
should I use another way to notify user when is turn to make a move.

There are multiple ways to inform a client of a change; if it's a small turnbased game between two players, I'd expect direct communication between those players, without the need for a server.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

OriginalGriff8-Oct-13 8:55

OriginalGriff

8-Oct-13 8:55

We can't really answer that as is: there are far, far too many options.

One mans "multiplayer online game" is Halo4, another is Sims3, or Scrabble!

They need very, very different approaches, and trying to decide that you want "SQL Broker" to sort it all out before you look at how much data needs to fly around, and where and when it needs to fly is like deciding you want a 5.2l V8 engine, before you chose the curtains!

The only instant messaging I do involves my middle finger.

English doesn't borrow from other languages.
English follows other languages down dark alleys, knocks them over and goes through their pockets for loose grammar.