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Big model & point clouds - memory use constantly climbs, constant HDD activity

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    Big model & point clouds - memory use constantly climbs, constant HDD activity

    Hi Everyone,

    I'm trying to finish off a big project in RVT 2016.

    It contains a number of large point clouds which I need to create the model accurately.

    My problem is that while I'm working, the memory usage climbs progressively, from about 4GB at the outset, until it runs out at 15GB. The whole time my (solid state) HDD is whirring away like crazy.

    Turning the point clouds off seems to stop it happening, but the memory usage sticks at whatever level it was at when I turned the linked clouds off.

    Purge unused makes no difference.

    I don't understand what all the HDD activity is, because it starts when my RAM is only about 1/3rd used. It seems like its using virtual memory, but there's no need for it.

    PC spec is i7 3930k running at 4GHz (though Revit seems not to tax the processor at all) with half-full 1TB HDD, 16 GB ram, quadro 2000 GPU

    any help greatly appreciated

    #2
    Break up the recap files into manageable files by creating new rcp's with the rcs files to not duplicate your data

    using worksets with these broken up files helps as well, when you open your local just specify your worksets you want open

    Revit has a hard time clearing the ram usage without closing the project when you load it up like that

    is the scan data local?

    for how cheap ram is bump up to 32gb and it will make a huge difference when working with pointclouds in general

    future reference its a bit confusing referring to a SSD as a HDD

    Everything in windows can start acting very odd when you max out ram like that so first thing I would try is to break up the scans/load only what you need/upgrade RAM
    William Fletcher
    IPD Engineering
    Linkedin

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      #3
      thanks for reply

      scan data is 70% local, the rest on two flash drives.

      It's already broken up quite significantly - per floor or each building - but I got very dense clouds back from the surveyors (20GB per floor)

      I'd thought about getting some more RAM, but didn't think it would make much difference, since the HDD activity starts when RAM usage is below 4GB, which I assumed meant that whatever's happening begins before RAM starts running out.

      I have found that keeping Revit to only one view window keeps the growth rate of memory usage much lower, so it's more like an hour before I need to close and reopen, rather than 10 mins, as happens with a floor plan, an elev and a few 3D views open. I just wish Revit allowed you to auto-close each old window when you open a new one.

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        #4
        If the files are 20GB per floor, maybe take them through Recap to tune down their resolution, sounds like you don't need them that dense.

        Comment


          #5
          Originally posted by mommus View Post
          Hi Everyone,

          I'm trying to finish off a big project in RVT 2016.

          It contains a number of large point clouds which I need to create the model accurately.

          My problem is that while I'm working, the memory usage climbs progressively, from about 4GB at the outset, until it runs out at 15GB. The whole time my (solid state) HDD is whirring away like crazy.

          Turning the point clouds off seems to stop it happening, but the memory usage sticks at whatever level it was at when I turned the linked clouds off.

          Purge unused makes no difference.

          I don't understand what all the HDD activity is, because it starts when my RAM is only about 1/3rd used. It seems like its using virtual memory, but there's no need for it.

          PC spec is i7 3930k running at 4GHz (though Revit seems not to tax the processor at all) with half-full 1TB HDD, 16 GB ram, quadro 2000 GPU

          any help greatly appreciated
          That sounds like a memory leak in our point cloud engine integration. That's not supposed to happen. Can you confirm you're running the latest update of Revit 2016? If so, please get a support case going so we can investigate.

          As for the hard drive access, that is normal. Our point cloud engine is heavily dependent on disk I/O, as it uses cache data in Windows Temp directory - make sure that's located on your fastest storage drive - to minimize RAM consumption.

          -Kyle
          Director
          Building Design Strategy

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