Is Snr as fast as ATMOS only?
No, it still includes
- RADAER (UKCA_RADAER_ BAND_AVERAGE)
- Some scatter and gather of UKCA fields - difficult to remove
- Maybe other tracers which can be removed
- Send & receive fields with Jnr
On IBM, comparing Snr with 256 cores to ATMOS+CLASSIC with 256 cores
| Cores for Jnr | % slower than CLASSIC |
|---|---|
| 192 | 254% |
| 256 | 100% |
| 384 | 44% |
| 512 | 27% |
| 1,344 | 25% |