dayvbrown Posted October 27, 2009 Share Posted October 27, 2009 OK so this is a fun and joyous old problem that I had yet to come across with mantra as we had a homogenous farm up until now however... no longer the case as we are expanding the farm and my initial testing of the new setups (i7 procs) is showing up the problem of procedural patterns flicking on the different kinds of farm machines. Is there a fix for this or are we going to have to pool the the farm machines into different groups? Cheers, Dave. Quote Link to comment Share on other sites More sharing options...
rob Posted October 27, 2009 Share Posted October 27, 2009 Hi Dave, I do believe an open source random number generator is used by Houdini so all your renders should be the same. rob Quote Link to comment Share on other sites More sharing options...
edward Posted October 28, 2009 Share Posted October 28, 2009 Well, the same provided you are using exactly the same installed build of Houdini ... Processors should not make a difference but compiler versions, 32 bit vs 64 bit, etc. will make a difference. Quote Link to comment Share on other sites More sharing options...
dayvbrown Posted October 29, 2009 Author Share Posted October 29, 2009 Thanks for your replies, this is what i had been led to believe. Going through the installs the new machines are running Kubuntu 9.04 and the older machines Ubuntu 8.04, before we run through the joy of rebuilding machines perhaps this is likely to be the cause? both are running identical houdini installs. Thanks again, Dave. Quote Link to comment Share on other sites More sharing options...
edward Posted October 29, 2009 Share Posted October 29, 2009 I wonder if threading has anything to do with this. The older machines have less cores I assume? Quote Link to comment Share on other sites More sharing options...
dayvbrown Posted October 29, 2009 Author Share Posted October 29, 2009 (edited) I wonder if threading has anything to do with this. The older machines have less cores I assume? The older machines have 8 slower cores the new have 4 faster ones. Rendering without max processors and with thread count set to 1. old machines - Intel Xeon x5472 32gb RAM Ubuntu 8.04 Desktop Qube Bld 10.1 x86_64 Houdini - 10.0.374 new machines - Intel i7 920 CPU 12gb RAM Kubuntu 9.04 Desktop Qube Bld 10.1 x86_64 Houdini - 10.0.374 Edited October 29, 2009 by dayvbrown Quote Link to comment Share on other sites More sharing options...
edward Posted November 2, 2009 Share Posted November 2, 2009 And you installed the same gcc version build of Houdini? Quote Link to comment Share on other sites More sharing options...
dayvbrown Posted November 2, 2009 Author Share Posted November 2, 2009 And you installed the same gcc version build of Houdini? hmmm.... may have found the problem, they are using the recommended gcc versions for the linux installs which are different. Hopefully this is the cause. Thanks for all the help, much appreciated, Dave. Quote Link to comment Share on other sites More sharing options...
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