Hi Maxim, These tests you suggested in your email really make a lot sense. I will try them today and hopefully find the bottleneck. Thanks so much!
Jinghua On Mon, Feb 16, 2009 at 9:58 AM, Maxim Makhinya <[email protected]> wrote: > > Hello Jinghua, > > > That sound weird. Are you sure the problem is not with one of your > machines? > I think you should figure out first where is your performance > bottleneck, and > why this happens. You could try following and write back what you will > get: > > 1) remove all compositing paths, i.e. leave only rendering. As all > nodes will > render the same amount of data without compositing it should not > really > matter how many you use - 4 nodes for 1 Gb or 8 nodes for 2 Gb. > Speed > should remain roughly the same as there is no pictures transferred. > > 2) try to split config in to two independent parts - i.e. 4 nodes for > first > 1 Gb of data, another 4 nodes for second Gb, without final > compositing of > this two parts. Again, it should be symmetric and speed shouldn't > change > much. > > 3) if in the second path you will get your 10-12 fps, than just try to > combine > those results in one additional compositing on top. > > > Best regards, > > Makhinya Maxim > > > On Feb 16, 2009, at 4:01 PM, jinghua wrote: > > > > > Dear Stefan, > > > > I have tried Equalizer's eVolve volume renderer to render a > > 1kx1kx2k, ubyte > > volume over a remote 8-node cluster. I have changed the evolve code > > and > > shader to read in the original volume with one byte per voxel, and > > it all > > worked fine. My cluster has a Nvidia GeForce-9500 card with 1G > > memory on > > each node, and infiband private network among the nodes. I used > > direct send > > compound. Each node get 1kx1kx256 subvolume. Each node renders the > > 256M > > volume locally at 16-20fps. When I used 4nodes to render the 1G > > volume, the > > overall performance is about 10-12 fps. But when I used 8nodes to > > render the > > whole 2G volume, the frame rate drops down to 2fps. I have tried to > > use both > > DB and direct send compound, with ethernet and IB network, it's all > > very > > consistent 2fps performance. Are there something I can do to improve > > the > > performance? Thanks a lot! > > > > Jinghua http://n2.nabble.com/file/n2335264/test-8node.res.infi > > test-8node.res.infi > > > > Attached is my config file. > > -- > > View this message in context: > http://n2.nabble.com/eVolve-render-2G-volume-on-8nodes-at-2fps-tp2335264p2335264.html > > Sent from the Equalizer - Parallel Rendering mailing list archive at > > Nabble.com. > > > > > > _______________________________________________ > > eq-dev mailing list > > [email protected] > > http://www.equalizergraphics.com/cgi-bin/mailman/listinfo/eq-dev > > http://www.equalizergraphics.com > > > > > _______________________________________________ > eq-dev mailing list > [email protected] > http://www.equalizergraphics.com/cgi-bin/mailman/listinfo/eq-dev > http://www.equalizergraphics.com > -- Jinghua Ge, Ph.D Visualization Consultant, CCT 331 Frey Computing Services Center Louisiana State University Phone: (225) 578-7789 Fax: (225) 334-2061
_______________________________________________ eq-dev mailing list [email protected] http://www.equalizergraphics.com/cgi-bin/mailman/listinfo/eq-dev http://www.equalizergraphics.com
