Hi Dan,
Typically the -display command line option is used to specify which GPU
when there are more than one per host.
In the situation you describe running paraview on a single workstation
with 1 gpu and 8 cores, both rendering and IO are effectively serialized
as the server processes concurrently attempt to access the single gpu or
disk as the case may be. It is true that using OSMesa and the
--off-screen-rendering flag will get you real parallel software
rendering. However, comparing 1 process rendering with OSMesa to 1
process rendering on a gpu, the gpu rendering can be 100s of times
faster.* So for running on a single workstation your best bet is to
start off using hardware rendering on the gpu and limit the number of
server processes to 2 or 4 in order to limit contention for disk and
gpu. If you find the filters you use run significantly longer than the
reader or renderer, then you might experiment with more server
processes. As you do so if rendering becomes the significant bottleneck
you might experiment with OSMesa.
If you're having performance issues your best bet is to run PV on a cluster.
Burlen
* I don't know if you will have issues because of the ATI card.
Dan Lussier wrote:
Hello,
I have a question about running in parallel on OS X. I have built the
CVS version of Paraview with MPI such that it can run in parallel. I
am looking to run it across the CPUs local to my Mac Pro workstation
but also want them to share the GPU.
Here is my system config:
Mac Pro
2 x quad core Xeon
1 x ATI graphics card
In the documentation the recommendation is to use
--use-offscreen-rendering -display flags however when I do a pvserver
- h I do not even see a -display option and --use-offscreen-rendering
is labeled as only applicable to software or mangled Mesa rendering on
UNIX.
I am looking to achieve maximum overall speed (rendering + filters) on
OS X what options if any should I use for my command to initiate the
pvservers ?
Many thanks.
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