> This is not happening for me because all my file are simple legacy .VTK 
> files. Right?
> XML formatted files have this capacity even though they are not .P + (VTS, 
> VTI, VTR)

For structured datasets, yes. Note, there's still a tradeoff. With the
p* versions where you're presplitting the files, all ranks need not
open the same files and as a result will encounter less contention of
parallel file systems, than if you use a the non-p versions which save
everything in a single file. Whether the work of splitting is worth it
depends on how the data was generated in the first place and then how
many ranks/nodes you're planning to run this on. So I'd recommend
doing some testing on your target platform and then adopt one or the
other approach.

> 1. How to transform my simple legacy VTK files in XML file format? Only 
> rewriting them from the begginning?

You can simply load it in ParaView or VTK and save it out as one the XML files.

> 2. Any thoughts on XML written files versus .PVTK generated by ParaView when 
> saving data?

I am not sure what you mean. Can you elaborate? If you're referring to
tradeoff between .p* and non-p versions of the XML files then see the
note earlier.

Utkarsh
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