Liu Xiaoyan (liuxy++at++ihpc.nus.edu.sg)
Tue, 09 Mar 1999 19:07:16 +0800
It seems that you're using vtk to create geometry, It's possible that vtk is not
multiple process safe.
My collegue had this experience using vtk with CAVE, but I'm not sure what exactly
it is.
-liu
Larry Ramey
> Shared Memory problems with sproc
>
> pfPerson->Rant()
> pfPerson->Rage()
>
> Thanks to everyone that has helped us trace down these last few bugs.
> (Angus and Benedikt especially) So here is the final analysis.
>
> We have a Origin 2000 with RE2 Graphics, 8 R10000s.
>
> We are using the CAVE(tm) Library from Univ. of Chicago. CAVE Lib will
> fork APP/CULL/Draw off if it detects enough processors. We are also
> creating a sproced series of workers based on the number of processors.
> We have a user shared memory arena (We create this in a C++ class of our
> own using usconfig and usinit) and we have (of course) pfSharedArena.
>
> all right here is the main.cc
>
> int msize=CmdDef::getMemSize(argv[1]); //process config file
> Shmem::setup(msize); // setup user shared arena
> TimeDef::init(); // init list of TimeDefs in User shared memory
> CoordDef::init(); // coord list
> CmdDef::init(); //cmd list
> Colt::init(); // color tables list
>
> DataDef::init(); //data file list
> WorkQ::init(1); // configures workQue to have one worker (to ease
> debugging)
>
> LightMgr::init(); //list of lights
> GobDef::init(); //list of graphics
>
> CmdDef::readConfigFile(argv[1]);
> CmdDef::print();
>
> pfInit();
> CmdDef::doCmdType(CmdDef::MODEL_SUFFIX);
> sgManager::init(10); //pfMallocs a structure
> containing pointers to masterChan, scene, and the top level DCS. There
> objects aren't created yet, just the pointers
> pfCAVEConfig(&argc,argv,NULL); // configure viewport and decide how to
> fork off APP/CULL/DRAW
> pfConfig(); // fork em
> pfCAVEInitChannels();
>
> fflush(stdout);
> cout.flush();
> sgManager::createScene(); // CREATES pfScene,pfDCS,and pfGeoState
> create_scene(); // load files and start sproc off the work
> Que
> pfCAVEPreDrawFunc(appPreDraw); // do any OpenGL rendering
> int doOnce =1;
> sleep(120); // I'll explain this
> while (!CAVEgetbutton(CAVE_ESCKEY))
> {
> psgManager::update();//advance animation, update navigation, ect
> pfSync();
> pfCAVEPreFrame();
> pfFrame();
> pfCAVEPostFrame();
> }
> CAVEHalt();
> pfExit();
> WorkQ::cleanup();
> Shmem::cleanup();
> return 0;
> }
>
> So, inside the function create_scene parameters are read from a config
> file and they are placed on the work Queue. IF we run on a single
> processor machine.. (ie APP/CULL/DRAW are all one process) everything is
> fine. If we run on the Origin everything breaks. ANY GEOMETRY CREATED ON
> THE WORK QUEUE NEVER SHOWS UP!(8processors, separate APP/CULL/DRAW) I
> printed the scene graph from the CULL process and the Nodes simply were
> not there.
>
> Now to explain the sleep. IF I sleep for 120 seconds (longer than it
> takes our work queue to create vtk objects and then convert them to
> Geodes) then enter the pfSync/pfFrame loop, then the geometry appears.
> (on the Origin)
>
> Let me say that again. IF the Work Queue creates the Geometry before the
> FIRST time pfSync/pfFrame is called everything shows up like it should.
>
> Inside the work Queue I use pfGetSharedArena to get the memory that I
> use to create the verts inside the GeoSets. When I print the pointer
> returned by pfGetSharedArena it is the same as the pointer returned in
> the APP process.
>
> I feel that this is obviously a Shared Memory problem but I don't know
> where it is. Any Geometry explicitly loaded or created in the APP
> process shows up, anything created in the Work Queue after the first
> pfSync/pfFrame call never shows up. Irix 6.5.2, Performer dev 2.2,
> Execution env 2.2.3, openGL 1.1.
>
> Frustration 6.2 <grin>
>
> Angus, if you can solve this with one e-mail I will send you a copy of
> all the 5 Nations Rugby games (I am taping them) Go Scotland!!!!
> ---------------------------------------------------------------
> Larry E. Ramey ramey++at++ccpo.odu.edu
> 757-683-6276(office) 757-683-5335 (CAVE)
> "Count the heads man." - Zaphod Bebblebrox
> "Won't weigh you down, with good intentions" -Sarah McLachlan
> =======================================================================
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-- *********************************************************************** Liu Xiaoyan Institute of High Performance Computing Research Engineer National University of Singapore Data Visualisation Group http://www.ihpc.nus.edu.sg Tel:(65)7709267 ***********************************************************************
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