Does the performance improve in fullscreen?  I can see having to share time with the rest of the GUI, but in full screen there is nothing else taking time.

 Sat, May 21, 2011 at 7:12 AM, cyrille henry <ch@chnry.net> wrote:
hello,

from my experience, Gem is 2 times faster on the same computer using ubuntu than osX.
thanks to nvidia profiling tools, Nicolas pointed that gem is limited to 50% usage of the GPU.
there is certainly a limitation somewhere on osX preventing application to use full performance of the hardware.

so, you applications are slower, but the interface will always be smooth...

Cyrille

Le 21/05/2011 12:59, jack@rybn.org a écrit :
Hello Chris,

If I have time to do this test the next time i will do it (putting the
graphic card on the 4x PCIe bus).
Now, it works fine with 2 MacPro (with one graphic card and 2 PS3 Eye on
each MacPro) and Ubuntu 10.04.
I have installed PureData 0.42.5, last GEM from SVN and ATI driver
Catalyst for the Radeon HD 5770 and the acceleration is OK.
When i was using 'dialog' message, i can't remember what i got.
Thanx for your help and suggestion. I will try to test all your
recommandations the next time.
One remark : it seems the graphic acceleration is better under Ubuntu than
MacOSX. Is there a problem with the driver under MacOSX ? (The same patch
worked faster under Ubuntu).
++

Jack



Jack

I think two of those cards might draw too much power to run at the same
time?  Also, check the PCIe lane speeds and try running them at 4x or 8x
rather than 16x.

AS far as getting 4 of the same cam running, it depends on how the driver
presents multiple cams to Quicktime.  It might show up as one device with
four inputs, for example.  Use the 'dialog' message to check it out.

On Thu, May 19, 2011 at 5:00 AM, Jack<jack@rybn.org>  wrote:

Thanx Mathieu,

I will give it a try with your tips.
I have started to install Ubuntu 10.04 on the Mac Pro and i think i will
use this OS.

In fact, i am crazy because i have installed two ATI Radeon HD 5770 on
this Mac Pro (version 5.1). Each card has 2 Mini Display Ports and 1 DVI
port. On the Apple website it is write each graphic card accept a
resolution of 2560x1600 px. When i plug 2 TV screen (HDMI and each
screen with 1280x768px) on the 2 Mini Display Port on one card (with an
adapter Mini Display Port/HDMI), it works fine. But if i use the second
card with the same configuration (so 4 TV screen on the 4 Mini Display
Port), it seems the computer have not enough power, the Finder quit each
10 second.
I use MacOSX.6.6 and this is not the lastest version (the lastest is
X.6.7 and maybe it is working with this version but now i have no time
to test this config).

With Ubuntu, the sytem start to load then the 4 screens stay black. I
have to unplug the 2 cables on one graphic card to boot normaly. So i
can only use 2 screens.

I don't know where is the problem (power ? Apple computers ?).
If someone have any experience on this problem, i will be happy to
listen him.

Now, the solution that i am going to use :
1 Mac Pro with Ubuntu and one graphic card (ATI Radeon HD 5770)
1 PC with Ubuntu and one graphic card (NVidia GT 440 or NVidia GTX 460)
++

Jack




Le mercredi 18 mai 2011 à 11:58 -0400, Mathieu Bouchard a écrit :
On Wed, 18 May 2011, jack@rybn.org wrote:

I'm going to work on a Mac Pro with MacOsX.6.7 and the latest stable
Pd-extended 0.42.5. I would like to connect four PS3 Eye on this
computer and use GEM with pix_video to read these four devices in
four
instance of Pd (=>  one camera per instance of pd). I will use Macam
driver (or something else ?) Is it easy to get each camera working
in
the same time on this system ? Do you have experience in this area ?

My experience with just one cam on OSX and Pd-extended 42 was that
object
creation order mattered because each [pix_video] object automatically
opens the first available camera AND the "device 1" method didn't
work.
So, to access only the 2nd camera, I had to create two objects and
only
use the 2nd one.

using 4 [pix_video] objects for 4 cameras may work, but they will be
assigned by creation order.

  _______________________________________________________________________
| Mathieu Bouchard ---- tél: +1.514.383.3801 ---- Villeray, Montréal,
QC


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