checkpoint simulator

[bena-nasa]

Just want to make sure this gets captured. This is my checkpoint "simulator" or "benchmark" whatever you want to call it.
This writes multiple variables to a netcdf file simulating MAPL's checkpoint mechanism. Multiple strategies can be chosen based on the input such writing to one file or multiple files and do 2D or 3D gather, and the num of trials to run to get statistics.
It reports the file system performance and the overall throughput (i.e. the full gather/write performance) as well as the standard deviation for the number of trials.

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Trivial change (affects only documentation or cleanup)

Checklist:

• I have tested this change with a run of GEOSgcm (if non-trivial)
• I have added one of the required labels (0 diff, 0 diff trivial, 0 diff structural, non 0-diff)
• I have updated the CHANGELOG.md accordingly following the style of Keep a Changelog