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Index > Windows > Dual Core Coding !?

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Kuemmel



Joined: 30 Jan 2006
Posts: 198
Location: Stuttgart, Germany
Kuemmel
Hi there,

I would like to 'pimp' my fractal/mandelbrot code for Windows with the proper use of a dual core processor, as this would be a pretty good application. It can be calculated perfectly in parallel way...has anyone ever done some coding for a dual core ? Or even a tutorial ? Or is there any basic problem doing this with FASM ?
Post 23 Mar 2006, 13:29
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Have you tried using two threads?
Post 23 Mar 2006, 15:04
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Kuemmel



Joined: 30 Jan 2006
Posts: 198
Location: Stuttgart, Germany
Kuemmel
locodelassembly wrote:
Have you tried using two threads?


Actually I'm quite new to Windows / x86 programming and I just focused on simple single task code...so what you are saying, is that setting two threads could work this out ?

Is there any decent example for thread programming ?
What about the register set up of a dual core machine ? Can each core have it's on registers or is that totally managed on the core ?

Sorry for the confusion...may be this has been addressed before and I didn't manage to find something while searching the board.
Post 23 Mar 2006, 20:18
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Kuemmel, if your Windows supports that Dual-Core processor you only need to make your application multi-threaded. Is responsability of the operating system dispatching threads for execution on both cores and only one thread can be executed in a core at a time.

Sorry, I haven't got any link to threading in assembly, all I can tell you is search in MSDN CreateThread and things related. Maybe someone have links?

Regards
Post 23 Mar 2006, 20:40
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Madis731



Joined: 25 Sep 2003
Posts: 2141
Location: Estonia
Madis731
Only making 2 threads won't help. You need to tell these threads what to do. I suggest making one thread go from the beginning and the other from the end if that is possible and check some flag if they met in the middle and you're done Very Happy
Post 24 Mar 2006, 08:20
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Kuemmel



Joined: 30 Jan 2006
Posts: 198
Location: Stuttgart, Germany
Kuemmel
@locodelassembly: Thanks for the MSDN CreateThread proposal, I check that one out

@Madis731: That was my plan more or less. Having two threads, one will calculate the upper half of the fractal on the screen, the other the lower one. I'm just wondering how these two threads will share data or register, etc. For sure it's better when they both have their own local data to limit whatever kind of existing memory or register access penalties in the pipelines...got to read more about this architecture anyway I think...

Anybody else some Threading-Example with FASM ?
Post 24 Mar 2006, 12:36
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Well I'm blind for sure, I visited iczelion page yesterday and I didn't find it, but now http://win32assembly.online.fr/tut15.html . "Tutorial 15: Multithreading Programming" very clear but my eyes didn't read that yesterday...

Well it's MASM but it's not hard to convert to FASM.

Hope it helps you

Regards
Post 24 Mar 2006, 14:26
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madmatt



Joined: 07 Oct 2003
Posts: 1045
Location: Michigan, USA
madmatt
Here's some simple examples of multi-threading in Fasm, You'll have to put my TurboAsmDx.dll in your "C:\WINDOWS\SYSTEM32" folder. Also, you'll need to go to my website http://users.egl.net/talktomatt/default.html and download my include directory and replace the stadard one that comes with Fasm so you can recompile them.
Post 24 Mar 2006, 18:26
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