id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
7	VERY IMPORTANT: Updated Saddle Point 4D-Var	arango		"Continue improving the saddle-point 4D-Var to solve latency issues when writing and reading NetCDF data.

* Introduced '''SKI_REORTHO''' to skip the re-orthonormalization of the Arnoldi vectors in '''gmres.F'''.  In some applications, it does not affect convergence or results, but it accelerates the computations.  It can be done because '''GMRES''' minimization is a very robust method.

* Added '''nf90_share''' to '''netcdf_create''' and '''netcdf_open''' to facilitate access to a NetCDF  written and read by different processes. It is only avaluable for the NetCDF-3 library.

* A new logical argument, '''Lclose''', is added to '''def_state.F''' to close the file after being created to alleviate access latency between split sub-groups of PETs.

*  A call to '''netcdf_sync''' is added to the beginning '''state_read.F'''. It Synchronizes NetCDF data to disk. It allows processes open for reading data to update the number of records written by other processes. The writer flushes buffers to disk, and the reader makes sure that it is reading from disk rather than from previously cached buffers.

* Reworked '''action=3''', in '''atimesv.F''' to avoid reading '''TLmodVal''' from disk. A collected MPI communication is done in '''saddle_point.h''' instead.
"	defect	closed	major		component1		fixed