Dear all,
so based on the timer log results that i collected, what i read about offscreen-rendering and the explanation below, can i conclude the followings? someone pls correct me if i'm wrong! with --use-offscreen-rendering X windows are disabled on all server processes all server processes render the geometry locally then each server processes sends the image to the client for compositing there's NO data gathering to process 0, meaning the master doesn't collect all images from each processes for composting, then only send it to the client for rendering that's why --use-offscreen-rendering is faster without --use-offscreen-rendering X windows are enabled on all server processes all server processes the raw data, then send all geometry to process 0 process 0 gather all geometry then send them to the client to render the client does all the rendering job that's why without --use-offscreen-rendering is slower any help / reply is highly appreciated Best Regards, chewping Date: Fri, 20 Nov 2009 10:57:25 +0800 From: [email protected] To: [email protected] CC: [email protected] Subject: Re:[Paraview] Off Screen Rendering hi chew ping： The Problem:"Display is not accessible on the server side. Remote rendering will be disabled.", it means that not all server start up X Server, so the server will process the raw data and send all geometry to the client to render. The client do all the rendering job, that's the reason why case 2 is so slow, I think. When you use off screen, all server processes render the geometry locally , send image to client to composite, so case 1 much faster than case 2. I hope this can help you, for I got the same problem before. Good luck. 在2009-11-20，"chew ping" <[email protected]> 写道： Dear all, i'm doing parallel rendering using 2 machines (np4), i notice an obvious difference between using offscreen-rendering (faster) and without offscreen-rendering (much slower). i realize this from the timer log: Case 1: with offscreen-rendering ---------------------------------------------------------- Local Process Still Render, 0.666444 seconds Execute vtkMPIMoveData id: 519, 0.000199 seconds Execute vtkPolyDataMapper id: 311, 0.000106 seconds Server, Process 0 Execute vtkFileSeriesReader id: 238, 0.645881 seconds Execute vtkPVGeometryFilter id: 305, 0.005891 seconds Execute vtkPVCacheKeeper id: 516, 7.8e-05 seconds Execute vtkMPIMoveData id: 519, 0.000212 seconds Execute vtkOrderedCompositeDistributor , 0.000152 seconds Execute vtkPolyDataMapper id: 311, 0.000274 seconds Server, Process 1 Execute vtkFileSeriesReader id: 238, 0.000275 seconds Execute vtkPVGeometryFilter id: 305, 0.005299 seconds Execute vtkPVCacheKeeper id: 516, 7.7e-05 seconds Execute vtkMPIMoveData id: 519, 0.000147 seconds Execute vtkOrderedCompositeDistributor , 0.000117 seconds Execute vtkPolyDataMapper id: 311, 9.9e-05 seconds Server, Process 2 Execute vtkFileSeriesReader id: 238, 0.000258 seconds Execute vtkPVGeometryFilter id: 305, 0.004765 seconds Execute vtkPVCacheKeeper id: 516, 7.7e-05 seconds Execute vtkMPIMoveData id: 519, 0.000147 seconds Execute vtkOrderedCompositeDistributor , 0.000111 seconds Execute vtkPolyDataMapper id: 311, 9.5e-05 seconds Server, Process 3 Execute vtkFileSeriesReader id: 238, 0.000352 seconds Execute vtkPVGeometryFilter id: 305, 0.005351 seconds Execute vtkPVCacheKeeper id: 516, 7.7e-05 seconds Execute vtkMPIMoveData id: 519, 0.000168 seconds Execute vtkOrderedCompositeDistributor , 0.000111 seconds Execute vtkPolyDataMapper id: 311, 0.000108 seconds --------------------------------------------------------------- Case 2: without offscreen-rendering --------------------------------------------------------------- Local Process Still Render, 4.86495 seconds Execute vtkMPIMoveData id: 520, 2.81566 seconds Execute vtkPolyDataMapper id: 312, 0.00012 seconds Execute vtkPolyDataMapper id: 148, 7.6e-05 seconds Server, Process 0 Execute vtkFileSeriesReader id: 239, 0.659133 seconds Execute vtkPVGeometryFilter id: 306, 0.026125 seconds Execute vtkPVCacheKeeper id: 517, 7.8e-05 seconds Execute vtkMPIMoveData id: 520, 2.53214 seconds Dataserver gathering to 0, 1.98166 seconds Dataserver sending to client, 0.549715 seconds Execute vtkOrderedCompositeDistributor , 0.000175 seconds Server, Process 1 Execute vtkFileSeriesReader id: 239, 0.000446 seconds Execute vtkPVGeometryFilter id: 306, 0.026313 seconds Execute vtkPVCacheKeeper id: 517, 7.3e-05 seconds Execute vtkMPIMoveData id: 520, 0.232435 seconds Dataserver gathering to 0, 0.232117 seconds Execute vtkOrderedCompositeDistributor , 0.00012 seconds Server, Process 2 Execute vtkFileSeriesReader id: 239, 0.000519 seconds Execute vtkPVGeometryFilter id: 306, 0.026063 seconds Execute vtkPVCacheKeeper id: 517, 7e-05 seconds Execute vtkMPIMoveData id: 520, 1.31373 seconds Dataserver gathering to 0, 1.31341 seconds Execute vtkOrderedCompositeDistributor , 0.000119 seconds Server, Process 3 Execute vtkFileSeriesReader id: 239, 0.000459 seconds Execute vtkPVGeometryFilter id: 306, 0.004905 seconds Execute vtkPVCacheKeeper id: 517, 6.9e-05 seconds Execute vtkMPIMoveData id: 520, 0.764289 seconds Dataserver gathering to 0, 0.740679 seconds Execute vtkOrderedCompositeDistributor , 0.000136 seconds -------------------------------------------------------------------- Unlike Case 2, Case 1 does not show any 'Dataserver gathering to 0' or 'Dataserver sending to client' so i guess what makes Case 2 slower is because the vtkMPIMoveData is doing extra thing to move data amongst processes btw, whenever i run it without -offscreen-rendering, i get this message: "Display is not accessible on the server side. Remote rendering will be disabled." based on what i read from paraview tutorial, what i understand is that the parallel rendering algorithm allows each process to independently render its partition of the geometry and then composites the partial images together to form the final image. Is this what happened in Case 2 because it has 'Dataserver gathering to 0' or 'Dataserver sending to client'? actually what i dont understand is why case 2 is much slower than case 1? is it because different 'things' are going on in the processes when offscreen-rendering is on/off? any help / reply is highly appreciated Best Regards, chewping 看陆川杨幂新片《琴棋书画》，品网易3D国韵网游《天下贰》
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