[Haskell-cafe] Re: OpenGL Speed!

[Peter Verswyvelen]

On a modern PC, this is no problem at all.

We are actually doing this with a 1920 x 1080 x 32-bit bitmap, at 60 FPS, on
a 2-year old PC

You can easily test your GPU <-> CPU bandwidth using this tool:
http://sourceforge.net/projects/gpubench


On Fri, Sep 17, 2010 at 7:53 PM, Lie Ryan <lie.1296 at gmail.com> wrote:

> On 07/30/10 03:37, Nick Bowler wrote:
> > On 2010-07-29 11:30 -0600, Luke Palmer wrote:
> >> If you are trying to redraw in realtime, eg. 30 FPS or so, I don't
> >> think you're going to be able to.  There is just not enough GPU
> >> bandwidth (and probably not enough CPU).
> >
> > Updating an 800x600 texture at 30fps on a somewhat modern system is
> > absolutely *not* a problem.
>
> It depends. Updating 800x600 screen at 24-bit color 30 times per second
> requires 800*600*24*30 = 345600000 bytes/s = 329 MB/s which is larger
> than the size of typical Video Memory, and the first version of PCI
> Express (introduced 2003) is only 250 MB/s/lane.
>
> While the bandwidth and Video Memory size is sufficient to transfer
> 329MB/s, it is quite near to the limit, especially if you have another
> programs running, which may cause some resource contention or if you
> used some memory-heavy techniques like double buffering.
>
> You're probably quite safe if you have PCI Express version 2, have over
> 1GB RAM, and a good Video Card. You're probably quite screwed if your
> VGA uses a Shared Memory Architecture (i.e. it uses RAM for video
> memory, this easily causes resource contention).
>
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