[Rtk-users] CUFFT error

[ghostcz]

Thank you.
I kept the dimension to the same value. I think reducing the spacing will need less rows in the projections, because the physical length will reduce with the spacing.
Interestingly, it also works if I use 0.0462 instead of 0.04623 as spacing.
Yes, I use –subsetsize=1 and –division=2 while –lowmem enabled. The origin is always updated with –0.5*spacing*(size-1);

Best regards,
Louie

From: Simon Rit 
Sent: Tuesday, August 04, 2015 12:09 PM
To: ghostcz 
Cc: rtk-users at public.kitware.com 
Subject: Re: [Rtk-users] CUFFT error

Hi,

>From this page, you have

CUFFT_ALLOC_FAILED   = 2,  //  cuFFT failed to allocate GPU or CPU memoryThis is not suprising that you have a GPU memory issue when decreasing the spacing because a finer volume spacing might require  more rows of the projections for the reconstruction and therefore you can end up with being out of memory. Try processing one projection at a time with --subsetsize 1. If it's still too large, you'll have to change your --dimension to process a smaller volume in the y direction.

Simon


On Tue, Aug 4, 2015 at 10:49 AM, ghostcz <ghostcz at hotmail.com> wrote:

  Dear rtk users/developers,

  I was testing the rtkfdk.exe application.
  The program ran into an error and caught an exception saying:
  “
  itk::ExceptionObject (00000000002EEA60)
  Location: "unknown"
  File: C:/Users/liy/root/RTK/code/rtkCudaFFTRampImageFilter.cu
  Line: 97
  Description: itk::ERROR: CUFFT ERROR #2”
  To save you a trip to the documentation, Line: 97 is here:
  “
  if(fftDimension.z==1)
      result = cufftPlan2d(&fftFwd, inputDimension.y, inputDimension.x, CUFFT_R2C);
    else
      result = cufftPlan3d(&fftFwd, inputDimension.z, inputDimension.y, inputDimension.x, CUFFT_R2C);
    CUFFT_CHECK_ERROR(result);
  “

  This occurred when --spacing=0.04623, while the program works just fine if I use --spacing=0.05.
  Is there anyone can help me with this?

  Best regards,
  Louie

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