[Mono-list] offtopic, but cool

[Cesar Mello]

Hi Cory!

yeap you're right! I didn't notice the struct was small. I'd like to see 
the struct you used in the C++ sample if possible (just 4 ints?)

I'll do the same benchmark later when I get home, and try with different 
compilers and allocators. Pretty interesting!

Best regards,
Mello

Cory Nelson wrote:

>Yea I thought of that, but doing so made it take twice the time:
>
>list<rect*> rl;
>for(int i=0; i<1000000; i++) {
>	rect *r=new rect;
>	r->x=i;
>	r->y=i;
>	r->width=i;
>	r->height=i;
>
>	rl.push_back(r);
>}
>
>
>----- Original Message -----
>From: Cesar Mello <cmello2@terra.com.br>
>Date: Wed, 12 May 2004 09:41:24 -0300
>Subject: Re: [Mono-list] offtopic, but cool
>To: Cory Nelson <phrosty@gmail.com>
>Cc: mono-list <mono-list@lists.ximian.com>
>
>
>Hi Cory,
>
>In the C++ sample, you are passing the rect by value, so you are
>saving a copy in the list. In C# a reference to the object is used, so
>there is no copy-construction overhead.
>
>You can change the list<rect> to a list<rect*>, but this way you have
>to manage the memory by yourlself.
>
>[]
>Mello
>
>
>
>Cory Nelson wrote:
>Just got done installing the VS.NET 2005 preview and did a small test.
>
>I compared an ArrayList of Rectangles to a List<Rectangle>, and timed
>inserting 1mil rects into each.  I also wrote an equivalent c++ app. 
>Got some interesting results:
>
>ArrayList: 265ms
>List<Rectangle>: 62ms
>list<rect>: 141ms
>
>So it seems with generics .NET is finally faster than c++ (at least,
>in this case).
>
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>  
>