jason_slab Posted August 19, 2008 Share Posted August 19, 2008 nice Jeff, i can't wait to look at some example files:) jason Quote Link to comment Share on other sites More sharing options...
edward Posted August 19, 2008 Share Posted August 19, 2008 I can't stress enough that CPU usage is NOT related to performance. One can easily have more CPU usage and still be slower! Use wall clock timing tests to compare between using OpenMP and not using OpenMP. Quote Link to comment Share on other sites More sharing options...
vmuriel Posted August 19, 2008 Share Posted August 19, 2008 It's true, but we are talking of the same program with or without the openmp c++ flag. The only difference of with/without openmp cpu behavior graphic, are thats five small peeks when all cores work together, the rest is normal one core execution. The conclusion is clear, I think. Quote Link to comment Share on other sites More sharing options...
malexander Posted August 20, 2008 Share Posted August 20, 2008 I can't stress enough that CPU usage is NOT related to performance. Somewhat unrelated, but using a GPU to accelerate computation really throws this assumption for a loop as well. Because all of the computation is offloaded to the GPU, the CPU sits idle (or near idle). In those cases, the machine appears to be doing nothing but yet gets the job done 20x faster. It is a little strange to see the first time In fact, with power-saving technologies enabled (Cool n'Quiet or SpeedStep), the CPU will sometimes even power down to a lower GHz level. Quote Link to comment Share on other sites More sharing options...
Jeff Lait Posted August 26, 2008 Share Posted August 26, 2008 Well, now what I really want is Jeff's MasterClass files (knew I shoulda gone to SIGGRAPH this year ) The raw version of the presentation (.hip file clips, powerpoint, etc) is now online on the Website with the other mastercourse materials. http://www.sidefx.com/index.php?option=com...&Itemid=264 Note that you may still want to use the plugin created earlier - 9.5 Gas Field Vop isn't multithreaded and processes the curl noise once per vx, vy, and vz channels, so is around 12x slower than it could be. - Jeff Quote Link to comment Share on other sites More sharing options...
digitallysane Posted August 26, 2008 Author Share Posted August 26, 2008 Note that you may still want to use the plugin created earlier - 9.5 Gas Field Vop isn't multithreaded and processes the curl noise once per vx, vy, and vz channels, so is around 12x slower than it could be. Is this gonna change (soon)? It kinds of frighten me that fluids (and dynamics) which are notoriously slow generally speaking, are not multithreaded fully in Houdini. I can understand that it might be hard to rewrite for multithreading older modules of Houdini, but for DOPS (which are new) this was part of the design consideration, right? Dragos Quote Link to comment Share on other sites More sharing options...
Jeff Lait Posted August 26, 2008 Share Posted August 26, 2008 Is this gonna change (soon)? It kinds of frighten me that fluids (and dynamics) which are notoriously slow generally speaking, are not multithreaded fully in Houdini.I can understand that it might be hard to rewrite for multithreading older modules of Houdini, but for DOPS (which are new) this was part of the design consideration, right? Multithreading is something very important for Fluids, which is why a lot of it is multithreaded. The specific case of the Gas Field Vop, however, was not multithreaded in time for the 9.5 release. It is multithreaded in the latest internal version, but the change is rather dangerous to put into 9.5. Quote Link to comment Share on other sites More sharing options...
digitallysane Posted August 26, 2008 Author Share Posted August 26, 2008 :notworthy: Quote Link to comment Share on other sites More sharing options...
jason_slab Posted August 27, 2008 Share Posted August 27, 2008 The raw version of the presentation (.hip file clips, powerpoint, etc) is now online on the Website with the other mastercourse materials.http://www.sidefx.com/index.php?option=com...&Itemid=264 Note that you may still want to use the plugin created earlier - 9.5 Gas Field Vop isn't multithreaded and processes the curl noise once per vx, vy, and vz channels, so is around 12x slower than it could be. - Jeff nice thx for posting this Jeff jason Quote Link to comment Share on other sites More sharing options...
GallenWolf Posted September 1, 2008 Share Posted September 1, 2008 Woo! Can't wait to try it. Now... to get the HD version of apprentice X) Quote Link to comment Share on other sites More sharing options...
aracid Posted September 6, 2008 Share Posted September 6, 2008 Hey this looks really interesting, has anyone had any success compiling this for the mac ? thanks in advance Quote Link to comment Share on other sites More sharing options...
ofer Posted September 7, 2008 Share Posted September 7, 2008 but why OpenOffice ? Quote Link to comment Share on other sites More sharing options...
johner Posted September 8, 2008 Share Posted September 8, 2008 For what it's worth, the presentations from SIGGRAPH 2008 are now availble at Siggraph Encore. This particular one is $9.99, I think, and does a pretty good job of explaining the paper. Just search for "wavelet turbulence", or enter 2008, Papers, Jiggly Fluids in the various dropdown lists on the main page. Quote Link to comment Share on other sites More sharing options...
Netvudu Posted December 10, 2008 Share Posted December 10, 2008 Just out of curiosity...what Quote Link to comment Share on other sites More sharing options...
queglay Posted February 15, 2010 Share Posted February 15, 2010 (edited) this is an old but great thread. does houdini in its current build implement the same technology to get the same results as demoed here? Edited February 15, 2010 by queglay Quote Link to comment Share on other sites More sharing options...
edward Posted February 17, 2010 Share Posted February 17, 2010 http://www.sidefx.co...1524&Itemid=132 In particular, the last video. A demo video made using it: http://www.sidefx.com/index.php?option=com_content&task=view&Itemid=322&id=1487 Quote Link to comment Share on other sites More sharing options...
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