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Next: 6.18.2 Invoking exch2 Up: 6.18 exch2: Extended Cubed Previous: 6.18 exch2: Extended Cubed Contents 6.18.1 Introduction
The exch2 package extends the original cubed sphere topology
configuration to allow more flexible domain decomposition and
parallelization. Cube faces (also called subdomains) may be divided
into any number of tiles that divide evenly into the grid point
dimensions of the subdomain. Furthermore, the tiles can run on
separate processors individually or in groups, which provides for
manual compile-time load balancing across a relatively arbitrary
number of processors.
The exchange parameters are declared in
pkg/exch2/W2_EXCH2_TOPOLOGY.h
and assigned in
pkg/exch2/w2_e2setup.F. The
validity of the cube topology depends on the SIZE.h file as
detailed below. The default files provided in the release configure a
cubed sphere topology of six tiles, one per subdomain, each with
32
Next: 6.18.2 Invoking exch2 Up: 6.18 exch2: Extended Cubed Previous: 6.18 exch2: Extended Cubed Contents mitgcm-support@dev.mitgcm.org
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32 grid points, with all tiles running on a single processor. Both
files are generated by Matlab scripts in
utils/exch2/matlab-topology-generator; see Section
