Snr speed for different Jnr decompositions

For N216 Snr with 16x16 MPI tasks, running for 5 days.

Jnr PEs Total time for Snr (s)
UM_SHELL OASIS3_GET_SNR
48x28=1,344 1,506 107
32x16=512 1,532 141
16x24=384 1,740 334
16x16=256 2,413 1,016
8x24=192 3,075 1,686