| VEC_IGNORE_OFF_PROC_ENTRIES, which causes VecSetValues() to ignore | - entries destined to be stored on a separate processor. This can be used
to eliminate the global reduction in the VecAssemblyXXXX() if you know
that you have only used VecSetValues() to set local elements
|
| VEC_IGNORE_NEGATIVE_INDICES, which means you can pass negative indices | - in ix in calls to VecSetValues() or VecGetValues(). These rows are simply
ignored.
|
| VEC_SUBSET_OFF_PROC_ENTRIES, which causes VecAssemblyBegin() to assume that the off | - process
entries will always be a subset (possibly equal) of the off-process entries set on the
first assembly which had a true VEC_SUBSET_OFF_PROC_ENTRIES and the vector has not
changed this flag afterwards. If this assembly is not such first assembly, then this
assembly can reuse the communication pattern setup in that first assembly, thus avoiding
a global reduction. Subsequent assemblies setting off-process values should use the same
InsertMode as the first assembly.
|