The netCDF Operators NCO version 5.0.1 have arrived.
http://nco.sf.net (Homepage, Mailing lists, Help)
http://github.com/nco (Source Code, Issues, Releases, Developers)
What's new?
Version 5.0.1 contains the necessary options for ncremap to exploit
MPI-enabled weight generators such as ESMF_RegridWeightGen.
You can probably skip this release unless you use ncremap.
Work on NCO 5.0.2 has commenced and and it targeted to offer ncremap
support for the MOAB offline regridding package mbtempest.
Enjoy,
Charlie
NEW FEATURES (full details always in ChangeLog):
A. ncremap accepts two new and related options, mpi_pfx and mpi_nbr.
The --mpi_pfx=mpi_pfx option specifies an appropriate job
scheduler prefix for MPI-enabled weight-generation
executables such as ESMF's ESMF_RegridWeightGen and MoabTempest's
mbtempest. Other weight generators (ncks, GenerateOfflineMap)
are unaffected by this option since they are not MPI-enabled.
mpi_pfx defaults to mpirun -n $mpi_nbr on all machines except those
whose $HOSTNAME matches an internal database of DOE-operated
supercomputers where mpi_pfx defaults to srun -n $mpi_nbr.
When invoking --mpi_pfx, be sure to explicitly define the
number of MPI tasks-per-node, e.g.,
ncremap --mpi_pfx='srun -n 16' ...
ncremap --mpi_pfx='srun --mpi=pmi2 -n 4' ...
The separate --mpi_nbr=mpi_nbr option specifies the
number of tasks-per-node that MPI-enabled weight generators
will request. It preserves the default job scheduler prefix (srun or
mpirun):
ncremap --mpi_nbr=4 ... # 16 MPI tasks-per-node for ERWG/mbtempest
ncremap --mpi_nbr=16 ... # 4 MPI tasks-per-node for ERWG/mbtempest
Thus --mpi_nbr=mpi_nbr can be used to create host-independent ncremap
commands to facilitate benchmarking the scaling of weight-generators
across hosts that work with the default value of mpi_pfx.
The --mpi_pfx option will prevail and --mpi_nbr will be ignored if
both are used in the same ncremap invocation. Note that mpi_pfx is
only used internally by ncremap to exploit the MPI capabilities of
select weight-generators. It is not used to control and does not
affect the distribution of multiple ncremap commands among a cluster
of nodes.
http://nco.sf.net/nco.html#mpi_pfx
http://nco.sf.net/nco.html#mpi_nbr
BUG FIXES:
A. No bug fixes this release
Full release statement at http://nco.sf.net/ANNOUNCE
--
Charlie Zender, Earth System Sci. & Computer Sci.
University of California, Irvine 949-891-2429 )'(
