When using simfactory, if I write in my parameter file that the output directory for the hdf5 files is "./hdf5" (e.g., CarpetIOHDF5::out2D_dir = "./hdf5_2D") then this directory is created in the output-00?? directory. Therefore each run creates a separate hdf5 directory in the corresponding output-00?? one. This is how I avoid losing all data if one run has problems.
Cheers, Bruno
Il giorno ven 16 dic 2022 alle ore 10:10 Samuel Tootle < tootle@itp.uni-frankfurt.de> ha scritto:
I don't think this is by default per say. I use batchtools (instead of simfactory) exactly for this reason and discourage new users from restarting in the same directory as the parent checkpoints to avoid this exact outcome. An additional issue that can arise is if a job is terminated before the walltime such that the data stored in ASCII/HDF5 goes beyond the last checkpoint are potential ingestion issues due to data mismatching from the restart. I think overall Kuibit handles this well, but it is has been an issue in the past for some users before learning to separate restarts into individual directories.
Cheers,
Samuel On 12/16/22 10:01 AM, Bruno Giacomazzo wrote:
- Safety feature to avoid HDF5 files from being corrupted
- Leo requests a feature that would allow the user to e.g., generate one output file per restart. With kuibit, there was interested in
switching from the ASCII data files to the HDF5 in our research group. However, in a recent simulation it turned out that a node failure caused a crash as one of the HDF5 was being written to and we lost all data for an important gridfunction. If one HDF5 file was written per restart (or another safety feature was in place), then this would have not been an issue, as only one of the chunks of data would have been corrupted. Leo will open a ticket about this.
Isn't this done automatically when using simfactory? I have my hdf5 data written in the separate output-00?? directories (the ones generated by symfactory at each restart) so that if one run has problems I do not lose all the data.
Cheers, Bruno
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Prof. Bruno Giacomazzo Department of Physics University of Milano-Bicocca Piazza della Scienza 3 20126 Milano Italy
email: bruno.giacomazzo@unimib.it phone: (+39) 02 6448 2321 web: http://www.brunogiacomazzo.org
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