Aims of UKESM-fast

Get our UKESM N96-ORCA1 model to run as fast as possible, with only a slight degradation of the science.

Speed

  • Rough targets
    • 20 model years/day maximum speed
    • >10 model years/day on ~40 nodes
  • Current speeds (UKESM0.9.3 without climate meaning and massive STASH)
    • 5.7 model years/day on 120 nodes (u-aw725, 113 nodes for ATM)
    • 3.6 model years/day on 43 nodes (u-aw709, 38 nodes for ATM)

Degradation of science

What degradation is acceptable?

  • Beyond that model must run, I don't know
    • Relying on other members of group
    • We'll run the usual valuation tools
    • By pushing the limits, we'll find what is unacceptable