[vtk-developers] Caching library

[Berk Geveci]

This would be a potentially very useful addition, as long as it was done in
a way that followed the correct VTK patterns. You will probably create a
custom vtkExecutive subclass (probably a subclass of
vtkCompositeDataPipeline) to do this. We have an external module
functionality that can be used to host this externally but optionally pull
it into a VTK build. Bill Lorensen is the expert there and can provide some
guidance I hope.

C++11 should not be an issue. VTK will require C++11 in the next version
coming in the beginning of 2018. It is currently possible to enable C++11
enable support and everything compiles & works.

Best,
-berk

On Sat, Oct 29, 2016 at 2:09 PM, Bc. Lukas HRUDA <hrudalu at students.zcu.cz>
wrote:

> Hello,
> We are aware that many VTK filtres are implemented so that when input
> values of two successive calls are the same, the filter performs the
> calculation only once (during the first call). However, what if the
> repetitive pattern is a more complex? For example, the pattern could be 1,
> 1, 1, 2, 2, 1, 1, 2, 2, 1, 2, 1, in which case you probably agree with me
> that it would be very benefitial to calculate the output for input 1 once
> and for input 2 once.
> Of course in general we don't know the pattern in advance and the set of
> possible inputs can be very large.
>
> I am a student at the University of West Bohemia, Faculty of Applied
> Science, Department of Computer Science, Czech Republic.
> As a part of my bachelor thesis I have designed and implemented a small
> library that can be used for caching results of time consuming calculations
> in such cases.
> The library was integrated and tested in a visualisation application for
> medical data which is based on VTK.
> The library aims to reduce number of repeated calculations that take
> noticeable time (what is considered noticeable may differ from case to
> case, in some cases it can be 1 second, in other cases it can be 30
> milliseconds).
> The library's system works in a way that when the programmer runs any
> calculation through it, it remembers the input and output and if a
> calculation with the same input is run through it againt later, it does not
> start the calculation and returns the remembered result instead.
> The library does this whole process itself without programmers
> interaction, it just needs to be properly initialized.
> It is very generic, so it can be used for caching almost any type of data.
>
> Me and the supervisor of my bachelor thesis thought that this library
> could be useful for you and we decided that we would like to integrate it
> into the VTK.
> It can be used to significantly speed up visualisations where any time
> consuming calculation may occur more than once.
>
> Would you be interested to have our library integrated in VTK, perhaps as
> an optional modul, so that VTK programmers could use it to speed up their
> filters or whole applications? Please note that the library uses variadic
> templates so it needs C++11 to compile.
> If you have any questions about the library I will be glad to answer them.
>
> Best regards
> Lukas Hruda
>
>
>
>
>
>
>
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