[Rtk-users] Issue report regarding the recorder of Time elapsed

[Simon Rit]

Hi Guangming,
It's not surprising to me that the backprojection is faster than the
forward projection, that's what I expect. If the total time is longer,
that's probably that some individual steps are not included in the total
time. Can you try to add
reader->Update();
before the line

itk::TimeProbe totalTimeProbe;

in rtksart.cxx? It may be that all the reading operations are done but
not timed in the sart->Update(). Why they are so long, I don't know,
is your D: drive a network drive? Do you observe the same behavior if
you do rtksart 2 times in a row?

Simon



On Mon, Jul 27, 2015 at 12:30 AM, Guangming Zang <
guangming.zang at kaust.edu.sa> wrote:

> Hi RTK community,
> i am using SART algorithm to reconstruct an object.
> But in this new RTK version, the time recording seems a little weird:
>  the total time is 1219.12s , but adding the time cost in different stages
> is not 1291.12 s. especially for "backprojection" part, only 16.6051s to
> reconstruct a 128^3 volume ?? even shorter than forward projection part.
> BTW, the -f and -b are Joseph and VoxelBasedBackProjection, respectively,
> both multi-threading  i think.
> Can anyone tell me what's going on?
> Thanks
> Regards
> Guangming
>
> [image: 内嵌图片 1]
> *Guangming Zang (Alex)*
> *King Abdullah University of Science and Technology(KAUST)*
> *University of Chinese Academy of Sciences(UCAS)*
>
>
>
>
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