Re: [LAD] CUDA

Hello,

Thank you for updating this very interresting post.
Do you have any website where you update the status of your work, publish
som test codes ?

Cheers

On Thu, Sep 4, 2008 at 5:52 PM, Jens M Andreasen
<jens.andreasen@email-addr-hiddenwrote:

> Some time ago I mentioned having this performance problem:
>
> On Mon, 2008-08-25 at 20:48 +0200, Jens M Andreasen wrote:
> > For 1024 bytes the transfer will take about 0.2 ms. That is 20% of the
> > available time if we use a time granularity of a single millisecond.
> > OTOH this appears to be mostly an intial constant, (much) more data can
> > be transferred in the exact same amount of time if that is what is
> > needed.
>
> I have since then updated to kernel 2.6.24.7-rt.17 (and compiled for
> this systems E1200/Core2)
>
> This by itself doubled the throughput, so the upload would be done in
> approx 100us (or better.)
>
> By chance I then tried to run the test back from runlevel 3? This got me
> down to 25us! ... which also happens to be the target I had been aiming
> for.
>
> A minimal X-setup, as in:
>
> $ startx /usr/bin/xterm -- :1 -depth 16
>
> .. yields the same fine results, and so does a lightweight environment
> like IceWM.
>
> But running the (default) Gnome Desktop Environment is consistently
> quadrupling latencies from main to graphics memory? I have no idea what
> is going on here, but kicking out gnome seems to solve the problem.
>
>
> /jens
>
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Received on Thu Sep 4 20:15:01 2008