> The feasability of implementing/using said format in post processing
tools should therefore be an important criteria.
I would even say a prerequisite. We already have it in opm-common in a shape
that can be used without post processing tools, but if we are to support it
within Flow, I believe we must have support in at least Resinsight.
> . I *think* Petrel / eclrun / eclipse has some functionality in this
regard - if this is a file we can be compatible with that would make
very much sense.
Thanks for pointing it out. Yes, there is such a format. There are a number of
unknowns related to that format yet. What I believe already is clear is that it
is not supported by Eclipse directly, so it is also of the type the is created
after simulation is done. If anybody knows more about this format, please share.
> In addition to HDF5 I would consider looking into Parquet which at
least is a much newer format than HDF5
Thanks for the suggestion! Yes, we should read up on alternatives before
deciding. If anybody has any experience or knowledge on any of the containers,
please share. I am in deep water here 😊
-----Original Message-----
From: Opm <opm-boun...@opm-project.org> On Behalf Of Joakim Hove
Sent: tirsdag 19. mai 2020 07:23
To: opm@opm-project.org
Subject: Re: [Opm] File formats
My take on this is:
1. Yes I see the value of a transposed file format - however the value
is quite limited before it is implemented in post processing tools.
The feasability of implementing/using said format in post processing
tools should therefor be an important criteria.
2. I *think* Petrel / eclrun / eclipse has some functionality in this
regard - if this is a file we can be compatible with that would make
very much sense.
3. In addition to HDF5 I would consider looking into Parquet which at
least is a much newer format than HDF5
Here is an extensive file-format comparison:
https://indico.cern.ch/event/613842/contributions/2585787/attachments/1463230/2260889/pivarski-data-formats.pdf
On 5/18/20 5:51 PM, Alf Birger Rustad wrote:
> Dear community,
>
> We are at a cross roads with respect to file formats, and I hope you are
> motivated to help us arrive at the best solution. We need better
> load-on-demand performance for summary files than what is currently possible
> with the default Eclipse format for summary files. Currently you will find an
> implementation in opm-common that simply transposes the summary vectors,
> while still using the same Fortran77 binary format. That approach has mainly
> three drawbacks. One is that it is not supported by any post-processing
> application (yet).
> The second is that it can only be created from a finished simulation, so you
> need to wait for simulations to finish before you get the performant result
> file.
For a traditional column oriented file format in any sense I think you will
need to write out the file in full, i.e. I think this will apply anyways. Use
of a database format might resolve this, or at least handle the appending
transparently, but that is maybe a bit overkill?
> The third being that it is not suited for parallel processing, so forget
> about each process writing out it's part.
For the summary files that is not so relevant, because the final calculation of
summary properties like WWCT = WWPR / (WWPR + WOPR) is only done on the IO rank
anyway.
Joakim
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