# Sharing of checkpoints

**URL:** <https://community.geodynamics.org/t/sharing-of-checkpoints/77>\
**Category:** Rayleigh\
**Created:** [September 28, 2018, 6:58pm UTC](https://community.geodynamics.org/t/sharing-of-checkpoints/77 "2018-09-28T18:58:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sglane](https://yyz2.discourse-cdn.com/flex036/user_avatar/community.geodynamics.org/sglane/32/12_2.png) [@sglane](https://community.geodynamics.org/u/sglane)\
**Post date:** [September 28, 2018, 6:58pm UTC](https://community.geodynamics.org/t/sharing-of-checkpoints/77/1 "2018-09-28T18:58:06Z")

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Hi,

in the workshop we discussed a possible repository for sharing checkpoints and I am now running in the situation, that it would help me, if I could get a checkpoint from somebody. This would save me some computation time. I need an equilibrated solution for the Christensen benchmark case 2 (MHD case) for an approximate resolution of l\_max=95 and N\_r=96. From this solution, I would like to decrease the Ekman number stepwise to 5e-5. I don’t have anything to offer, but I am happy to share the equilibrated checkpoints which I will have obtained then.

I think it would be beneficial to have a python scripts that convert checkpoints from Magic or Calypso to Rayleigh’s file format. We have a lot of Calypso runs at Berkeley, which could then be loaded to Rayleigh. I am happy to try programming a script for Calypso but I am uncertain about the input file format.  
@feathern Could you maybe point out where this information can be found.

Best,  
Sebastian

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**Author:** ![hrmatsui](https://yyz2.discourse-cdn.com/flex036/user_avatar/community.geodynamics.org/hrmatsui/32/9_2.png) [@hrmatsui](https://community.geodynamics.org/u/hrmatsui)\
**Post date:** [October 3, 2018, 8:09pm UTC](https://community.geodynamics.org/t/sharing-of-checkpoints/77/2 "2018-10-03T20:09:40Z")

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Hi, Sebastian,

I am looking at “Physics/Checkpointing.F90” to figure out the data format (or ordering of data) of Checkpointing file, and I almost figure out the order of data.

But, I have other questions about checkpoint file.

1. I remember that @feathern put a data to detect endian in data file. @feathern, which does data file have this endian flag?
2. Looking at data IO for checkpoint data with “\_grid\_etc” postfix, this file is written by “unformatted” data, is it correct? And, it would be a little bit tricky to read this file when we transfer to computers with different endian.

Best,  
Hiro.