UM version4.5 GCOM

Comparing the use of different versions of GCOM with UM Version4.5

=Preamble=

Versions of GCOM are available from:
 * https://puma.nerc.ac.uk/trac/UM/browser/GCOM

=GCOMv3.1=


 * Compatible with UMv4.5 without any code changes.
 * Principle benefit is a better all-to-all routine (used in gathering output data to the master process).

DDR Infiniband & Intel Harpertown

 * For Bristol's BlueCrystal-phase2 machine: