# Communication routines

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### 5 Communication routines

The routines in this chapter implement various global communication operators on vectors associated with a discretization mesh. For auxiliary communication routines not tied to a discretization space see 6.

5.1 psb_halo — Halo Data Communication
5.2 psb_ovrl — Overlap Update
5.3 psb_gather — Gather Global Dense Matrix
5.4 psb_scatter — Scatter Global Dense Matrix

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