Investigate & Document smallest amount of disk space needed for regridding.

[alxmrs]

The target disk space to use should be relative to the input weather data file size.

[alxmrs]

@pbattaglia: Any notes on how we can cut the disk space down for regridding?

[alxmrs]

From Peter:

I tested regridding 2 50GB HRES .gb files (I use two because each worker regrids 2 files at a time).

Findings:

• With the tempfile delete code, 100GB disk alloc fails due to insufficient disk (after 8 hrs)
• With the tempfile delete code, 150GB disk alloc stalls (running for 18 hours)
• With the tempfile delete code, 200GB disk alloc works (completes in 5.5 hours)
• Without the tempfile delete code, 200GB disk alloc works (completes in 5.5 hours)

Conclusions:

• 200GB is the minimum disk alloc required
• the tempfile delete code isn’t necessary (it might help, but the improvement in disk usage would be less than 50GB, so probably not worth the trouble)