Lutze Posted September 12, 2010 Share Posted September 12, 2010 Hello erveryone. I have a problem with rendering speed under linux. These are the sysem specs: Dual Xeon Quad 470 GTX 12GB Ram Ubuntu 10.04 -64 Windows 7 -64 When rendering under linux there is always a performance drop compared to windows 7. I just compared a scene today - 7 minutes for a still under Linux and 5 Minutes for the same project under windows. I noticed, that all 16 threads of the 8 cores are showing up in the system monitor under linux but they work with only 40-60 % while rendering. When I tell Houdini to use only 8 threads those threads work almost at 100 %, when increasing it to full 16 threads ... well again only 40-60% max. Under Windows all 16 threads work between 90 and 100% during the rendering as they should. This Problem arises not only under Houdini but also when rendering with V-Ray under linux. There is also a apr. 50% performace loss compared to windows. I would hate to switch back to windows as I feel a lot more comfortable under linux and the 470gtx seems to work al lot smoother under linux while handling big scenes. Any suggestions on how to solve this problem. Maybe a problem with Hyperthreading under Ubuntu (although in this case there wouldn´t be 16 threads recognized?). Sven Quote Link to comment Share on other sites More sharing options...
Erik_JE Posted September 15, 2010 Share Posted September 15, 2010 Do not know if this will help but things i would test would be: *Different distribution *Different kernel *Houdini version compiled with other gcc version but will probably not help as problems with v-ray also. Quote Link to comment Share on other sites More sharing options...
Lutze Posted September 15, 2010 Author Share Posted September 15, 2010 Do not know if this will help but things i would test would be: *Different distribution *Different kernel *Houdini version compiled with other gcc version but will probably not help as problems with v-ray also. Hmmmm... Just found out, that there seems to be core-scaling problem under newer versions of Ubuntu. Read in a forum, that the older 8.04 is far better in scaling multi-processor systems. Can anyone confirm this. Anybody running Houdini under a newer Ubuntu without having these speed problems? Maybe I switch back to 8.04 just to see how it performs... Quote Link to comment Share on other sites More sharing options...
Erik_JE Posted September 20, 2010 Share Posted September 20, 2010 Hmmmm... Just found out, that there seems to be core-scaling problem under newer versions of Ubuntu. Read in a forum, that the older 8.04 is far better in scaling multi-processor systems. Can anyone confirm this. Anybody running Houdini under a newer Ubuntu without having these speed problems? Maybe I switch back to 8.04 just to see how it performs... I am running under latest ubuntu 10.10. Unfortunately Dell was recently here and fudged up my nvidia graphics tho so can not run it atm but i can test when it gets fixed. However i do not think you need to rollback that far. I would definitely just try a different kernel version or compile before going back to such old dist version. Quote Link to comment Share on other sites More sharing options...
Lutze Posted September 20, 2010 Author Share Posted September 20, 2010 I am running under latest ubuntu 10.10. Unfortunately Dell was recently here and fudged up my nvidia graphics tho so can not run it atm but i can test when it gets fixed. However i do not think you need to rollback that far. I would definitely just try a different kernel version or compile before going back to such old dist version. Hi Erik, would be great if you could run a test when your graphics card is working again. At this moment I could not switch back to an older version because I need the system every day and can not afford to loose time installing/reinstalling. I think, as you said, using another kernel would be the way to go when I have some time again. Thanks again. Sven Quote Link to comment Share on other sites More sharing options...
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