[mdlug] [Fwd: Re: [opensuse] 64 bit vrs 32 bit advantages speed etc.]

[David Lane]

In C/C++ the pointers are limited by the bit word that is doing the pointing.  In 64bit your types and variables are larger and have a larger range. 

Theoretically

define MAX_BLOB_SIZE 128000;

class Example
{
public:
   //------: Data elements 
   char m_ItemName;
   void m_Blob[MAX_BLOB_SIZE];

   //------: Pointer members Linked lists 
   Example *m_NextExample;
   Example *m_PrevExample;

   //------: For sorting 
   Example *m_LeftChild;
   Example *m_RightChild;



   //------: Function members 
  int FunctionThatDoesStuff();

};


This is a class the holds a blob or what ever you want it ti be.  To compile and run the code you would not have to change the code to yield performance.  A program using this class can handle a larger list. And the "Tree" sort would perform better because the program stack is bigger.  

When you declair it:

main()
{
  
   Example *l_Current Item = new Example;
   //------: do more stuff

}

Just by changing to 64bit AND compiling under 64bit you get better performance hence bigger scale,  and you project manager is happy because migration time is less.








----- Original Message ----
From: Aaron Kulkis <akulkis3 at hotpop.com>
To: MDLUG's Main discussion list <mdlug at mdlug.org>
Sent: Wednesday, October 31, 2007 1:33:25 PM
Subject: Re: [mdlug] [Fwd: Re: [opensuse] 64 bit vrs 32 bit advantages speed etc.]


David Lane wrote:
> When I programmed in 16bit pc's there was a limit to the access of
 RAM.  
> 32bit extended that and of course 64 goes even further, because now 
> things are bigger. 
> 
> You would have to restructure applications to take advantage of 64bit
 
> architecture.

Or just declare bigger arrays ;-)


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