Hi Erik, Ian, Roland

Thanks so much for your replies!

Erik - this sounds like the easiest way. I did notice these utilities, however I can't find documentation on how to use them. Am I missing it somewhere?

Ian - yes, I did see that loop. I added a print statement inside it, and it looks like the code isn't even going into that loop (with out_timesteps_per_file=1 of course). I don't see any files with the "iter" suffix, and I am definitely looking at a new simulation directory.
I'll have a more in depth look at this in the coming weeks. Thanks!

Roland - thanks for your suggestion. I'll give this a go if the post-processing method doesn't work for me.

Again, thanks all for you help.
Cheers
Hayley



On 23 June 2017 at 01:55, Erik Schnetter <schnetter@cct.lsu.edu> wrote:
Hayley

The simplest way would be to post-process the HDF5 files after the simulation has finished. HDF5 comes with tools that manipulate HDF5 files, e.g. adding/removing compression, and also copying or selecting objects from one file to another. You can also use this to combine output from all processes into a single file. For post-processing, having one file per variable (!) and iteration is often the most convenient.

-erik



On Tue, Jun 20, 2017 at 9:04 AM, Hayley Macpherson <hayley.macpherson@monash.edu> wrote:
Hello,
I am using the Einstein Toolkit for cosmological simulations, and would like to ask a question regarding my HDF5 3D output. 
Currently I am outputting all 3D snapshots to one HDF5 file (as per default). I would like to have my output as separate files for each time snapshot, to help with ease of copying and visualisation in post processing. 

I found the following parameter in IOUtil, and changed it accordingly for a simulation:
IO::out_timesteps_per_file = 1
However this made no difference to my output, I still had multiple time snapshots in the one file. 

Is there another way to separate my 3D HDF5 output into one file per snapshot? 
Any help anyone can offer would be much appreciated! 

Kind regards,
Hayley Macpherson 

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